Re: value of pi and 22/7
On Mar 17, 5:22 pm, Kee Nethery k...@kagi.com wrote: My favorite approximation is: 355/113 (visualize 113355 split into two 113 355 and then do the division). The first 6 decimal places are the same. 3.141592920353982 = 355/113 vs 3.1415926535897931 Kee Nethery Or (more for fun than any practical application) try (2143/22)^(1/4) = 3.14159265268. Other approximations I have seen are root(10) and 3.142. This last was especially popular at school, which for me was sufficiently long ago to have used four figure log tables. The Old Testament (1 Kings 7,23) says ... And he made a molten sea, ten cubits from the one brim to the other: it was round all about, and his height was five cubits: and a line of thirty cubits did compass it round about. . So pi=3. End Of. -- http://mail.python.org/mailman/listinfo/python-list
Re: Abend with cls.__repr__ = cls.__str__ on Windows.
Terry Reedy tjre...@udel.edu wrote: On 3/17/2011 10:00 PM, Terry Reedy wrote: On 3/17/2011 8:24 PM, J Peyret wrote: This gives a particularly nasty abend in Windows - Python.exe has stopped working, rather than a regular exception stack error. I've fixed it, after I figured out the cause, which took a while, but maybe someone will benefit from this. Python 2.6.5 on Windows 7. class Foo(object): pass Foo.__repr__ = Foo.__str__ # this will cause an abend. 2.7.1 and 3.2.0 on winxp, no problem, interactive intepreter or IDLE shell. Upgrade? To be clear, the above, with added indent, but with extra fluff (fixes) removed, is exactly what I ran. If you got error with anything else, please say so. Described behavior for legal code is a bug. However, unless a security issue, it would not be fixed for 2.6. On Windows, I can replicate this with Python 2.7, Python 3.1.2, and Python 3.2. Here's the exact script (I had to change the print to be compatible with Python 3.2): bug.py -- class Foo(object): pass #def __str__(self): #if you have this defined, no abend #return a Foo Foo.__repr__ = Foo.__str__ # this will cause an abend. #Foo.__str__ = Foo.__repr__ #do this instead, no abend foo = Foo() print(str(foo)) -- for Python 3.2 the command: C:\Tempc:\python32\python bug.py generates a popup: python.exe - Application Error The exception unknown software exception (0xcfd) occurred in the application at location 0x1e08a325. Click on OK to terminate the program Click on CANCEL to debug the program So it looks to me to be a current bug. -- Duncan Booth http://kupuguy.blogspot.com -- http://mail.python.org/mailman/listinfo/python-list
Re: Fitting polynomial curve
On 3/17/2011 1:42 AM, Astan Chee wrote: I have 2 points in 3D space and a bunch of points in-between them. I'm trying to fit a polynomial curve on it. Currently I'm looking through numpy but I don't think the function exists to fit a function like this: y = ax**4 + bx**3 + cx**2 + dx + e You can use np.polyfit, which uses np.linalg.lstsq. For a degree M-1 polynomial and K samples such that K M, this is an over-determined least squares problem: t = [t1, t2, ..., tk] # K sample times Y.shape == (K, N) # data samples Y in R_N # design matrix X # you don't have to calculate this since polyfit does it # for you internally with vander(t, M) X = [[x**m for m in range(M-1,-1,-1)] for x in t] X.shape == (K, M) # unknown coefficient matrix B B.shape == (M, N) Y =~ dot(X, B) Use polyfit to form the least squares solution. For example, a 4th order fit: B = np.polyfit(t, Y, 4) # or for more information B, r, rankX, sX, rcond = np.polyfit(t, Y, 4, full=True) where r is the vector of residuals; rankX and sX are the rank and singular values of the Van der Monde matrix; and rcond was used to threshold the singular values. Interpolation: t2 = np.linspace(t[0], t[-1], len(t)*1000) Y2 = np.dot(np.vander(t2, M), B) or Y2 = np.polyval(B, t2[:, newaxis]) polyval uses Horner's method, which calculates the following: t = t2[:, newaxis] y = zeros_like(t) for i in range(len(B)): y = y * t + B[i] return y y is initially a length len(t) column vector of zeros and B[0] is a length N row vector, so the first iteration just tiles B[0] in a len(t) by N matrix. Otherwise it's a normal Horner evaluation. Other than minimizing the residuals, you can examine the fit visually with a simple matplotlib plot: from mpl_toolkits.mplot3d import Axes3D import matplotlib.pyplot as plt fig = plt.figure() ax = fig.gca(projection='3d') ax.plot(*Y2.T) ax.plot(*Y.T, marker='.', markerfacecolor='r') Or you could create three 2D plots of (t2, Y2[:,i]) and (t, Y[:,i]). -- http://mail.python.org/mailman/listinfo/python-list
Re: Abend with cls.__repr__ = cls.__str__ on Windows.
On Thursday, March 17, 2011 8:24:36 PM UTC-4, J Peyret wrote: I suspect that object.__str__ is really object.__repr__ by default, as they both print out the same string, so that this doesn't make any sense. They're not the same object, and they don't have all of the same methods. In [1]: object.__repr__ is object.__str__ Out[1]: False In [2]: object.__repr__.__name__ Out[2]: '__repr__' In [3]: object.__str__.__name__ Out[3]: '__str__' In [4]: object.__repr__.__hash__() Out[4]: 28910896 In [5]: object.__str__.__hash__() Out[5]: 28910976 In [6]: object.__repr__.__call__(100) Out[6]: 'int object at 0x01BE5234' In [7]: object.__str__.__call__(100) Out[7]: '100' -- http://mail.python.org/mailman/listinfo/python-list
Re: Multiprocessing.Process Daemonic Behavior
John L. Stephens lists.jksteph...@gmail.com writes: As the parent process terminates 'normally' (either through normal termination or SIGINT termination), mulitprocessing steps in and performs child process cleanup via the x.terminate() method. If the parent terminates any other way, multiprocessing doesn't have the opportunity to cleanup. Unless you handle the signal explicitly? Since SIGINT maps to KeyboardInterrupt automatically, you basically handle SIGINT but nothing else. A rude hack to your example with a handler for SIGTERM which just raises KeyboardInterrupt resulted in the children getting the SIGTERM 10 seconds afterwards. Which is after the sleep(10) call finishes in your script. -- http://mail.python.org/mailman/listinfo/python-list
Re: value of pi and 22/7
On 2011-03-18, peter peter.mos...@talk21.com wrote: The Old Testament (1 Kings 7,23) says ... And he made a molten sea, ten cubits from the one brim to the other: it was round all about, and his height was five cubits: and a line of thirty cubits did compass it round about. . So pi=3. End Of. RIIght. What's a cubit? -- Neil Cerutti -- http://mail.python.org/mailman/listinfo/python-list
Re: value of pi and 22/7
Neil Cerutti, 18.03.2011 13:17: On 2011-03-18, peterpeter.mos...@talk21.com wrote: The Old Testament (1 Kings 7,23) says ... And he made a molten sea, ten cubits from the one brim to the other: it was round all about, and his height was five cubits: and a line of thirty cubits did compass it round about. . So pi=3. End Of. RIIght. What's a cubit? http://en.wikipedia.org/wiki/Cubit I think that particular author of that particular part of the bible just used it to make the text appear older than it was at the time. Stefan -- http://mail.python.org/mailman/listinfo/python-list
Re: value of pi and 22/7
On 2011-03-18, Stefan Behnel stefan...@behnel.de wrote: Neil Cerutti, 18.03.2011 13:17: On 2011-03-18, peterpeter.mos...@talk21.com wrote: The Old Testament (1 Kings 7,23) says ... And he made a molten sea, ten cubits from the one brim to the other: it was round all about, and his height was five cubits: and a line of thirty cubits did compass it round about. . So pi=3. End Of. RIIght. What's a cubit? http://en.wikipedia.org/wiki/Cubit I think that particular author of that particular part of the bible just used it to make the text appear older than it was at the time. http://www.youtube.com/watch?v=n0KHt8xrQkk -- Neil Cerutti -- http://mail.python.org/mailman/listinfo/python-list
Re: value of pi and 22/7
peter Kee Nethery My favorite approximation is: 355/113 (visualize 113355 split into two 113 355 and then do the division). The first 6 decimal places are the same. 3.141592920353982 = 355/113 vs 3.1415926535897931 Kee Nethery Or (more for fun than any practical application) try (2143/22)^(1/4) = 3.14159265268. Other approximations I have seen are root(10) and 3.142. This last was especially popular at school, which for me was sufficiently long ago to have used four figure log tables. The Old Testament (1 Kings 7,23) says ... And he made a molten sea, ten cubits from the one brim to the other: it was round all about, and his height was five cubits: and a line of thirty cubits did compass it round about. . So pi=3. End Of. --- 3 is the best integer approximation to pi. So the bibel is right. Aage -- http://mail.python.org/mailman/listinfo/python-list
Re: value of pi and 22/7
Stefan Behnel stefan...@behnel.de writes: Neil Cerutti, 18.03.2011 13:17: On 2011-03-18, peterpeter.mos...@talk21.com wrote: The Old Testament (1 Kings 7,23) says ... And he made a molten sea, ten cubits from the one brim to the other: it was round all about, and his height was five cubits: and a line of thirty cubits did compass it round about. . So pi=3. End Of. RIIght. What's a cubit? http://en.wikipedia.org/wiki/Cubit I think that particular author of that particular part of the bible just used it to make the text appear older than it was at the time. Sigh. Doesn't *anyone* know Cosby any more? Kids today, no appreciation for the classics. :-( sherm-- -- Sherm Pendley http://camelbones.sourceforge.net Cocoa Developer -- http://mail.python.org/mailman/listinfo/python-list
Re: value of pi and 22/7
On Fri, 2011-03-18 at 02:10 -0700, peter wrote: On Mar 17, 5:22 pm, Kee Nethery k...@kagi.com wrote: My favorite approximation is: 355/113 (visualize 113355 split into two 113 355 and then do the division). The first 6 decimal places are the same. 3.141592920353982 = 355/113 vs 3.1415926535897931 Kee Nethery Or (more for fun than any practical application) try (2143/22)^(1/4) = 3.14159265268. Other approximations I have seen are root(10) and 3.142. This last was especially popular at school, which for me was sufficiently long ago to have used four figure log tables. The Old Testament (1 Kings 7,23) says ... And he made a molten sea, ten cubits from the one brim to the other: it was round all about, and his height was five cubits: and a line of thirty cubits did compass it round about. . So pi=3. End Of. The Bible uses integers due to memory constraints. -- http://mail.python.org/mailman/listinfo/python-list
Re: value of pi and 22/7
Sherm Pendley, 18.03.2011 14:46: Stefan Behnel writes: Neil Cerutti, 18.03.2011 13:17: On 2011-03-18, peterpeter.mos...@talk21.com wrote: The Old Testament (1 Kings 7,23) says ... And he made a molten sea, ten cubits from the one brim to the other: it was round all about, and his height was five cubits: and a line of thirty cubits did compass it round about. . So pi=3. End Of. RIIght. What's a cubit? http://en.wikipedia.org/wiki/Cubit I think that particular author of that particular part of the bible just used it to make the text appear older than it was at the time. Sigh. Doesn't *anyone* know Cosby any more? Kids today, no appreciation for the classics. :-( And what about Heinz Erhardt? *That's* a classic. Stefan -- http://mail.python.org/mailman/listinfo/python-list
Re: value of pi and 22/7
On 2011-03-18, peter peter.mos...@talk21.com wrote: The Old Testament (1 Kings 7,23) says ... And he made a molten sea, ten cubits from the one brim to the other: it was round all about, and his height was five cubits: and a line of thirty cubits did compass it round about. . So pi=3. End Of. There's nothing wrong with that value. The measurements were given with one significant digit, so the ratio of the two measurements should only have one significant digit. -- Grant Edwards grant.b.edwardsYow! It's some people at inside the wall! This is gmail.combetter than mopping! -- http://mail.python.org/mailman/listinfo/python-list
Re: value of pi and 22/7
On Mar 18, 2011, at 5:17 AM, Neil Cerutti wrote: On 2011-03-18, peter peter.mos...@talk21.com wrote: The Old Testament (1 Kings 7,23) says ... And he made a molten sea, ten cubits from the one brim to the other: it was round all about, and his height was five cubits: and a line of thirty cubits did compass it round about. . So pi=3. End Of. RIIght. What's a cubit? I use cubits all the time. The distance from my elbow to my finger tips equals one cubit. When you don't have a proper measuring tape, it can be pretty accurate for comparing two measurements. Kee Nethery -- http://mail.python.org/mailman/listinfo/python-list
Bounds checking
Hi,
if one has a set of values which should never step outside certain
bounds (for example if the values were negative then they wouldn't be
physically meaningful) is there a nice way to bounds check? I
potentially have 10 or so values I would like to check at the end of
each iteration. However as the loop is over many years I figured I
probably want to be as optimal as possible with my check. Any
thoughts?
e.g. this is my solution
# module contain data
# e.g. print state.something might produce 4.0
import state as state
def main():
for i in xrange(num_days):
# do stuff
# bounds check at end of iteration
bounds_check(state)
def bounds_check(state):
check state values are 0
for attr in dir(state):
if not attr.startswith('__') and getattr(state, attr) 0.0:
print Error state values 0: %s % (attr)
sys.exit()
if __name__ == __main__:
sys.exit(main())
thanks
Martin
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Re: value of pi and 22/7
In 8uh0rcfe1...@mid.individual.net Neil Cerutti ne...@norwich.edu writes: RIIght. What's a cubit? How long can you tread water? -- John Gordon A is for Amy, who fell down the stairs gor...@panix.com B is for Basil, assaulted by bears -- Edward Gorey, The Gashlycrumb Tinies -- http://mail.python.org/mailman/listinfo/python-list
Re: Bounds checking
What sort of checks are you making ? - in general greater than/less than
tend to be fairly optimal, although you might be able to do a faster is
negative test
Katie
On Fri, Mar 18, 2011 at 2:24 PM, Martin De Kauwe mdeka...@gmail.com wrote:
Hi,
if one has a set of values which should never step outside certain
bounds (for example if the values were negative then they wouldn't be
physically meaningful) is there a nice way to bounds check? I
potentially have 10 or so values I would like to check at the end of
each iteration. However as the loop is over many years I figured I
probably want to be as optimal as possible with my check. Any
thoughts?
e.g. this is my solution
# module contain data
# e.g. print state.something might produce 4.0
import state as state
def main():
for i in xrange(num_days):
# do stuff
# bounds check at end of iteration
bounds_check(state)
def bounds_check(state):
check state values are 0
for attr in dir(state):
if not attr.startswith('__') and getattr(state, attr) 0.0:
print Error state values 0: %s % (attr)
sys.exit()
if __name__ == __main__:
sys.exit(main())
thanks
Martin
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Re: Bounds checking
Martin De Kauwe wrote:
Hi,
if one has a set of values which should never step outside certain
bounds (for example if the values were negative then they wouldn't be
physically meaningful) is there a nice way to bounds check? I
potentially have 10 or so values I would like to check at the end of
each iteration. However as the loop is over many years I figured I
probably want to be as optimal as possible with my check. Any
thoughts?
e.g. this is my solution
# module contain data
# e.g. print state.something might produce 4.0
import state as state
def main():
for i in xrange(num_days):
# do stuff
# bounds check at end of iteration
bounds_check(state)
def bounds_check(state):
check state values are 0
for attr in dir(state):
if not attr.startswith('__') and getattr(state, attr) 0.0:
print Error state values 0: %s % (attr)
sys.exit()
if __name__ == __main__:
sys.exit(main())
thanks
Martin
Don't check for bounds, fix any bug in the code that would set your
values out of bounds and use asserts while debugging.
Otherwise if you really need dynamic checks, it will cost you cpu, for
sure. Howeverver you could for instance override the __setatttr__ of
state object, and call the attribute's associated function.
class State(object):
funcTable = {
'foo': lambda x: x = 0.0
}
def __init__(self):
self.foo = 0
def __setattr__(self, attribute, value):
if not self.funcTable.get(attribute, lambda x: True)(value):
sys.exit('error out of bound')
return object.__setattr(self, attribute, value)
Untested, however it's just an idea. I'm not even sure that would be
less cpu consuming :D
That way only attributes in functable execute a (cpu consuming ?) test
function, all other attributes will execute 'lambda x: True'.
The check occurs everytime you set an attribute however.
JM
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Re: Bounds checking
Jean-Michel Pichavant wrote:
Martin De Kauwe wrote:
Don't check for bounds, fix any bug in the code that would set your
values out of bounds and use asserts while debugging.
[ ... ]
def __setattr__(self, attribute, value):
if not self.funcTable.get(attribute, lambda x: True)(value):
sys.exit('error out of bound')
return object.__setattr(self, attribute, value)
Offhand, my only quibble is that sys.exit is not helpful for debugging.
Much better to raise an error:
if not self.funcTable.get(attribute, lambda x: True)(value):
raise ValueError ('error out of bound')
or define a subclass of ValueError just for this purpose. On error, the
program will stop just as dead, but you'll get a trace.
Mel.
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Re: value of pi and 22/7
On Fri, 2011-03-18 at 14:16 +, Grant Edwards wrote: On 2011-03-18, peter peter.mos...@talk21.com wrote: The Old Testament (1 Kings 7,23) says ... And he made a molten sea, ten cubits from the one brim to the other: it was round all about, and his height was five cubits: and a line of thirty cubits did compass it round about. . So pi=3. End Of. There's nothing wrong with that value. The measurements were given with one significant digit, so the ratio of the two measurements should only have one significant digit. I've worked in landscaping and [low-scale] agriculture - pi as 3 is used all the time. It is easy to compute in your head and close enough. -- http://mail.python.org/mailman/listinfo/python-list
Re: email library
peterob wrote:
Im completely confinvalided from email library. When you parse email from
file it creates object Message.
f = open(emailFile, 'r')
msg = email.message_from_file(f)
f.close()
How can I access RAW header of email represented by object msg? I dont
wanna access each header field by hand.
Im doing another parsing, searching for attachments and so on, with
email, but i need write raw data of email too. Do I have to allocate
another memory for that emailFile? (by mmap or f=open(rawemail).
For the ultimate in raw, open the email file and parse it manually.
Your other option is use msg.walk() and msg.items() and walk through the
returned (header, value) pairs.
8-
-- import email
-- msg = email.message_from_file(open(r'c:\temp2\latest_dbf.eml'))
-- from pprint import pprint as pp
-- for sub in msg.walk():
... pp(sub.items())
...
[('Return-path', 'someone@somewhere.invalid'),
('Envelope-to', 'someone@somewhere.invalid'),
('Delivery-date', 'Mon, 07 Mar 2011 18:32:18 -0600'),
('Received',
'from [72.11.125.166] (port=2728 helo=[192.168.10.136])\n\tby
gator410.hostgator.com with esmtpa (Exim 4.69)\n\t(envelope-from
someone@somewhere.invalid)\n\tid
1PwkqN-0001eV-54\n\tfor someone@somewhere.invalid; Mon, 07 Mar 2011
18:32:16 -0600'),
('Message-ID', '4D757B80.9020001@somewhere.invalid'),
('Date', 'Mon, 07 Mar 2011 16:42:40 -0800'),
('From', 'First Last someone@somewhere.invalid'),
('User-Agent', 'Thunderbird 1.5.0.10 (Windows/20070221)'),
('MIME-Version', '1.0'),
('To', 'First Last someone@somewhere.invalid'),
('Subject', 'latest dbf'),
('Content-Type',
'multipart/mixed;\n boundary=010408020108000602070901')]
[('Content-Type', 'text/plain; charset=ISO-8859-1; format=flowed'),
('Content-Transfer-Encoding', '7bit')]
[('Content-Type', 'text/plain;\n name=tables.py'),
('Content-Transfer-Encoding', '7bit'),
('Content-Disposition', 'inline;\n filename=tables.py')]
[('Content-Type', 'application/x-zip-compressed;\n name=dbf-0.88.18.zip'),
('Content-Transfer-Encoding', 'base64'),
('Content-Disposition', 'inline;\n filename=dbf-0.88.18.zip')]
8-
Hope this helps!
~Ethan~
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Remove all directories using wildcard
I'm new to python and I am trying to figure out how to remove all sub directories from a parent directory using a wildcard. For example, remove all sub directory folders that contain the word PEMA from the parent directory C:\Data. I've trying to use os.walk with glob, but I'm not sure if this is the right path to take. Thanks for any suggestions! -- http://mail.python.org/mailman/listinfo/python-list
Re: Remove all directories using wildcard
On 18/03/2011 16:41, JSkinn3 wrote: I'm new to python and I am trying to figure out how to remove all sub directories from a parent directory using a wildcard. For example, remove all sub directory folders that contain the word PEMA from the parent directory C:\Data. I've trying to use os.walk with glob, but I'm not sure if this is the right path to take. You've got a few options. And it depends whether you just want to get it done as simply as possible or whether you're using this as a learning exercise. Assuming it's somewhere between the two then you're on the right track with os.walk: code - untested import os import shutil for dirpath, dirnames, filenames in os.walk (c:/data): for dirname in dirnames: if pema in dirname.lower (): pema_path = os.path.join (dirpath, dirname) print Removing, pema_path shutil.rmtree (pema_path) dirnames.remove (dirname) /code The key is that os.walk is designed so that the dirnames list can be mutated in place to remove directories which are to be ignored for whatever reason. In this case, you delete the directory tree and remove it from os.walk's attention. BTW the use of os.walk here is only necessary if you need to remove *pema* directories at any level under c:\data. If you only need those immediately under c:\data then you can just use glob.glob in union with shutil.rmtree TJG -- http://mail.python.org/mailman/listinfo/python-list
RE: Remove all directories using wildcard
I'm new to python and I am trying to figure out how to remove all sub directories from a parent directory using a wildcard. For example, remove all sub directory folders that contain the word PEMA from the parent directory C:\Data. I've trying to use os.walk with glob, but I'm not sure if this is the right path to take. Thanks for any suggestions! I think I'd do something like this (untested). import os, shutil startDir = rC:\Data for item in os.listdir(startDir): folder = os.path.join(startDir, item) if os.path.isdir(folder) and PEMA in item: shutil.rmtree(folder) Cheers, Drea -- http://mail.python.org/mailman/listinfo/python-list
multiprocessing Pool workers cannot create subprocesses
In a recent application, a student of mine tried to create child processes inside of a multiprocessing Pool worker (for security and convenience reasons, we wanted to run some code inside of a child process). Here is some test code for python 2.7: = import multiprocessing as mp def run_computation(x): print 2*x def f(x): curr_proc=mp.current_process() # uncomment following line to get this to work #curr_proc.daemon=False p = mp.Process(target=run_computation, args=(x,)) p.start() p.join() pool = mp.Pool(processes=4) pool.map(f, range(10)) === The result is: Traceback (most recent call last): File daemon.py, line 17, in module pool.map(f, range(10)) File /opt/local/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/multiprocessing/pool.py, line 199, in map return self.map_async(func, iterable, chunksize).get() File /opt/local/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/multiprocessing/pool.py, line 491, in get raise self._value AssertionError: daemonic processes are not allowed to have children The problem appears to be that multiprocessing sets its workers to have the daemon flag set to True, which prevents workers from creating child processes. If I uncomment the line indicated in the code, I can create child processes and the program works (it prints out the even numbers from 0 to 18). It makes me nervous to just change the daemon status of the process like that, especially when I don't know the reason the workers have daemon=True to begin with. What is the reasoning behind that decision? What issues do we need to worry about if we just set the daemon mode flag like in the above code? Thanks, Jason -- http://mail.python.org/mailman/listinfo/python-list
Re: Bounds checking
def bounds_check(state):
check state values are 0
for attr in dir(state):
if not attr.startswith('__') and getattr(state, attr) 0.0:
print Error state values 0: %s % (attr)
sys.exit()
Not that related to the question. But it's usually better to raise an exception.
Exiting in the middle of a function usually make debugging later more
interesting.
You might find Traits interesting for validation, see
http://code.enthought.com/projects/traits/
HTH
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ctypes pointer to structure memory swap
I'm observing some strange behavior with ctypes. I created this test code to try to figure out what I'm doing wrong creating pointers to structures. from ctypes import * class QCamSettingId(Structure): QCam_settings_id _fields_ = [(f1, c_ulong), (f2, c_ushort), (f3, c_ushort), (f4, c_ubyte * 8)] class QCamSettingsEx(Structure): QCam_SettingsEx _fields_ = [(size, c_ulong), # Filled by the init routine (pSettingsID, POINTER(QCamSettingId)), # pointer to the camera settings ID (private_data, c_void_p )] # Pointer to a camera settings array class QMemDriver(): The wrapper of QCamDriver def __init__(self): self.QSetID = QCamSettingId() self.QSetID_p = pointer(self.QSetID) self.QSettings = QCamSettingsEx() self.QSettings.pSettingsID = self.QSetID_p self.QSettings_p = pointer(self.QSettings) def Test(self): Test the QCamSettinsEx object print self.QSettings.pSettingsID print self.QSettings.pSettingsID[0] print self.QSettings.pSettingsID print self.QSettings.pSettingsID[0] print pSettingsID is at, self.QSettings.pSettingsID print pSettingsID[0] is at, self.QSettings.pSettingsID[0] print pSettingsID is at, self.QSettings.pSettingsID print pSettingsID[0] is at, self.QSettings.pSettingsID[0] The results I get are. qmem.Test() QMEMTest.LP_QCamSettingId object at 0x011902B0 QMEMTest.QCamSettingId object at 0x01426850 QMEMTest.LP_QCamSettingId object at 0x011902B0 QMEMTest.QCamSettingId object at 0x01426850 pSettingsID is at QMEMTest.LP_QCamSettingId object at 0x011902B0 pSettingsID[0] is at QMEMTest.QCamSettingId object at 0x01426850 pSettingsID is at QMEMTest.LP_QCamSettingId object at 0x011902B0 pSettingsID[0] is at QMEMTest.QCamSettingId object at 0x01426850 qmem = QMEMTest.QMemDriver() qmem.Test() QMEMTest.LP_QCamSettingId object at 0x01426990 QMEMTest.QCamSettingId object at 0x014269E0 QMEMTest.LP_QCamSettingId object at 0x014269E0 QMEMTest.QCamSettingId object at 0x01426990 pSettingsID is at QMEMTest.LP_QCamSettingId object at 0x01426990 pSettingsID[0] is at QMEMTest.QCamSettingId object at 0x014269E0 pSettingsID is at QMEMTest.LP_QCamSettingId object at 0x014269E0 pSettingsID[0] is at QMEMTest.QCamSettingId object at 0x01426990 Sometimes the pointer and the object swap location and sometimes they don't. -- http://mail.python.org/mailman/listinfo/python-list
Re: Bounds checking
On Fri, Mar 18, 2011 at 3:01 PM, Jean-Michel Pichavant jeanmic...@sequans.com wrote: Don't check for bounds, fix any bug in the code that would set your values out of bounds and use asserts while debugging. Otherwise if you really need dynamic checks, it will cost you cpu, for sure. Howeverver you could for instance override the __setatttr__ of state object, and call the attribute's associated function. If the codes something critical (i.e. it's used for financial calculations, hardware control, etc.) it's probably safer to test it dynamically, unless you only have a finite number of inputs/outputs it's often hard to ensure you've fixed all the bugs. Katie -- CoderStack h http://www.coderstack.co.ukttp://www.coderstack.co.uk/perl-jobs The Software Developer Job Board -- http://mail.python.org/mailman/listinfo/python-list
Re: Two random lists from one list
Thanks All for your responses, all a help! -- http://mail.python.org/mailman/listinfo/python-list
Could I joined in this Happy family
Dear friends: I am in China.For some rearon,I cannot visit your Google Group.May I joint this mail list for help in learning Python? -- 笑看嫣红染半山，逐风万里白云间。 -- http://mail.python.org/mailman/listinfo/python-list
Re: Could I joined in this Happy family
Welcome aboard ! On Mar 18, 2011 11:34 AM, duxiu xiang xiangduxi...@gmail.com wrote: Dear friends: I am in China.For some rearon,I cannot visit your Google Group.May I joint this mail list for help in learning Python? -- 笑看嫣红染半山，逐风万里白云间。 -- http://mail.python.org/mailman/listinfo/python-list
class error
I have the following file: FileInfo.py: import UserDict class FileInfo(UserDict): store file metadata def __init__(self, filename=None): UserDict.__init__(self) self[name] = filename When i import it like so: import FileInfo i get this error: Traceback (most recent call last): File interactive input, line 1, in module File FileInfo.py, line 3, in module class FileInfo(UserDict): TypeError: Error when calling the metaclass bases module.__init__() takes at most 2 arguments (3 given) What is causing the error? -- http://mail.python.org/mailman/listinfo/python-list
Re: multiprocessing Pool workers cannot create subprocesses
In article 4d838d28.5090...@creativetrax.com, Jason Grout jason-pyt...@creativetrax.com wrote: The problem appears to be that multiprocessing sets its workers to have the daemon flag set to True, which prevents workers from creating child processes. If I uncomment the line indicated in the code, I can create child processes and the program works (it prints out the even numbers from 0 to 18). It makes me nervous to just change the daemon status of the process like that, especially when I don't know the reason the workers have daemon=True to begin with. What is the reasoning behind that decision? What issues do we need to worry about if we just set the daemon mode flag like in the above code? http://docs.python.org/library/multiprocessing.html#multiprocessing.Proce ss.daemon When a process exits, it attempts to terminate all of its daemonic child processes. Note that a daemonic process is not allowed to create child processes. Otherwise a daemonic process would leave its children orphaned if it gets terminated when its parent process exits. Additionally, these are not Unix daemons or services, they are normal processes that will be terminated (and not joined) if non-daemonic processes have exited. -- Ned Deily, n...@acm.org -- http://mail.python.org/mailman/listinfo/python-list
Re: class error
On 18/03/2011 20:13, monkeys paw wrote: I have the following file: FileInfo.py: import UserDict class FileInfo(UserDict): store file metadata def __init__(self, filename=None): UserDict.__init__(self) self[name] = filename When i import it like so: import FileInfo i get this error: Traceback (most recent call last): File interactive input, line 1, in module File FileInfo.py, line 3, in module class FileInfo(UserDict): TypeError: Error when calling the metaclass bases module.__init__() takes at most 2 arguments (3 given) What is causing the error? You're importing the module UserDict and then trying to create a subclass of it. The module UserDict contains the class UserDict. You could write either: import UserDict class FileInfo(UserDict.UserDict): or: from UserDict import UserDict class FileInfo(UserDict): -- http://mail.python.org/mailman/listinfo/python-list
Re: class error
monkeys paw wrote: I have the following file: FileInfo.py: import UserDict class FileInfo(UserDict): store file metadata def __init__(self, filename=None): UserDict.__init__(self) self[name] = filename When i import it like so: import FileInfo i get this error: Traceback (most recent call last): File interactive input, line 1, in module File FileInfo.py, line 3, in module class FileInfo(UserDict): TypeError: Error when calling the metaclass bases module.__init__() takes at most 2 arguments (3 given) What is causing the error? UserDict is a module -- you want to subclass the UserDict class inside the module... class FileInfo(UserDict.UserDict): etc etc ~Ethan~ -- http://mail.python.org/mailman/listinfo/python-list
Re: class error
On 18.03.2011 21:13, monkeys paw wrote: I have the following file: FileInfo.py: import UserDict After this import statement, the name UserDict refers to the module. class FileInfo(UserDict): Here you are trying to subclass the module. What you need instead is: class FileInfo(UserDict.UserDict): Alternatively, import the UserDict class from the UserDict module like so: from UserDict import UserDict Note, that the UserDict class is obsolete, you can subclass the dict type directly: class FileInfo(dict): store file metadata def __init__(self, filename=None): dict.__init__(self) self[name] = filename -- http://mail.python.org/mailman/listinfo/python-list
Re: Abend with cls.__repr__ = cls.__str__ on Windows.
On Mar 18, 2:18 am, Duncan Booth duncan.bo...@invalid.invalid wrote: Terry Reedy tjre...@udel.edu wrote: On 3/17/2011 10:00 PM, Terry Reedy wrote: On 3/17/2011 8:24 PM, J Peyret wrote: This gives a particularly nasty abend in Windows - Python.exe has stopped working, rather than a regular exception stack error. I've fixed it, after I figured out the cause, which took a while, but maybe someone will benefit from this. Python 2.6.5 on Windows 7. class Foo(object): pass Foo.__repr__ = Foo.__str__ # this will cause an abend. 2.7.1 and 3.2.0 on winxp, no problem, interactive intepreter or IDLE shell. Upgrade? To be clear, the above, with added indent, but with extra fluff (fixes) removed, is exactly what I ran. If you got error with anything else, please say so. Described behavior for legal code is a bug. However, unless a security issue, it would not be fixed for 2.6. On Windows, I can replicate this with Python 2.7, Python 3.1.2, and Python 3.2. Here's the exact script (I had to change the print to be compatible with Python 3.2): bug.py -- class Foo(object): pass #def __str__(self): #if you have this defined, no abend # return a Foo Foo.__repr__ = Foo.__str__ # this will cause an abend. #Foo.__str__ = Foo.__repr__ #do this instead, no abend foo = Foo() print(str(foo)) -- for Python 3.2 the command: C:\Tempc:\python32\python bug.py generates a popup: python.exe - Application Error The exception unknown software exception (0xcfd) occurred in the application at location 0x1e08a325. Click on OK to terminate the program Click on CANCEL to debug the program So it looks to me to be a current bug. Multiple people reproduce a Python hang/crash yet it looks like no one bothered to submit a bug report I observed the same behavior (2.6 and 3.2 on Linux, hangs) and went ahead and submitted a bug report. Carl Banks -- http://mail.python.org/mailman/listinfo/python-list
Re: class error
On 3/18/2011 4:43 PM, Alexander Kapps wrote: On 18.03.2011 21:13, monkeys paw wrote: I have the following file: FileInfo.py: import UserDict After this import statement, the name UserDict refers to the module. class FileInfo(UserDict): Here you are trying to subclass the module. What you need instead is: class FileInfo(UserDict.UserDict): OK, i overlooked that and the error was not very enlightening. Thanks very much. Alternatively, import the UserDict class from the UserDict module like so: from UserDict import UserDict Note, that the UserDict class is obsolete, you can subclass the dict type directly: class FileInfo(dict): store file metadata def __init__(self, filename=None): dict.__init__(self) self[name] = filename -- http://mail.python.org/mailman/listinfo/python-list
Reading/Writing files
Hello all, I am pretty new to Python and am trying to write data to a file. However, I seem to be misunderstanding how to do so. For starters, I'm not even sure where Python is looking for these files or storing them. The directories I have added to my PYTHONPATH variable (where I import modules from succesfully) does not appear to be it. So my question is: How do I tell Python where to look for opening files, and where to store new files? Thanks, Jon -- http://mail.python.org/mailman/listinfo/python-list
Re: ctypes pointer to structure memory swap
On Fri, 18 Mar 2011 10:34:35 -0700, Wanderer wrote: I'm observing some strange behavior with ctypes. I created this test code to try to figure out what I'm doing wrong creating pointers to structures. What makes you think that you're doing anything wrong. Note that the hex number shown when printing a ctypes object is the object's ID (as per the id() function). This is typically the address of the Python object. It is not the address of the structured data nor (in the case of a ctypes pointer) the value of the pointer. If you want to see the actual value of a ctypes pointer, cast it to c_void_p then examine the .value field, e.g.: p = pointer(x) print hex(cast(p, c_void_p).value) -- http://mail.python.org/mailman/listinfo/python-list
Use cookies from a script in a browser
Hi all, I use a scraper to retrieve data from a web page. In order to do that I need to enable cookies. The data that I'm looking for is contained in a bunch of web pages. Is there a way to show this web pages in a browser using the cookies used in the script (otherwise it doesn't work). Thanks, Mattia -- http://mail.python.org/mailman/listinfo/python-list
Re: Reading/Writing files
On 18/03/2011 5:33 PM, Jon Herman wrote: I am pretty new to Python and am trying to write data to a file. However, I seem to be misunderstanding how to do so. For starters, I'm not even sure where Python is looking for these files or storing them. The directories I have added to my PYTHONPATH variable (where I import modules from succesfully) does not appear to be it. So my question is: How do I tell Python where to look for opening files, and where to store new files? This is how you write to a file in Python myfile = open(path/to/the/file, wb) myfile.write(Hello world!\n) myfile.close() Beyond that, your message is too vague to offer any real help, but it sounds like you're way off track. If the above code doesn't help, please tell us exactly what you're trying to do, but you might want to read a Python book such as Dive Into Python first. Cheers, Matt -- http://mail.python.org/mailman/listinfo/python-list
Re: Reading/Writing files
On Fri, Mar 18, 2011 at 4:33 PM, Jon Herman jfc.her...@gmail.com wrote: Hello all, I am pretty new to Python and am trying to write data to a file. However, I seem to be misunderstanding how to do so. For starters, I'm not even sure where Python is looking for these files or storing them. The directories I have added to my PYTHONPATH variable (where I import modules from succesfully) does not appear to be it. So my question is: How do I tell Python where to look for opening files, and where to store new files? Thanks, Jon By default Python will read and write files from the directory that your program is run from. This cannot always be relied upon though (for instance if your program was imported as a module from another program). To find out what directory your program is currently in use os.getcwd(). Here's an example I just ran... import os os.getcwd() '/media/DATA/code/lispy/liSpy' The folder that is returned from os.getcwd() is the folder that open will use. You can specify another folder by giving the full path. open(/full/path/to/file.txt, w) PYTHONPATH is for importing modules, which is a separate concern. -- Jack Trades Pointless Programming Blog http://pointlessprogramming.wordpress.com -- http://mail.python.org/mailman/listinfo/python-list
Re: Reading/Writing files
Jon Herman wrote:
Hello all,
I am pretty new to Python and am trying to write data to a file.
However, I seem to be misunderstanding how to do so. For starters, I'm
not even sure where Python is looking for these files or storing them.
The directories I have added to my PYTHONPATH variable (where I import
modules from succesfully) does not appear to be it.
So my question is: How do I tell Python where to look for opening files,
and where to store new files?
There's nothing magical about it (plenty of irritating and frustrating
if using Windows, though ;).
somefile = open('test.txt') # opens file test.txt in current directory
someotherfile = open('./stuff/misc.txt') # opens misc.txt, which lives
# in stuff which lives in the
# the current directory
thatfile = open(r'c:\blah\whodunit.clu') # opens whodunit.clu which
# lives in blah off the C:
# drive
To get the current directory, if you don't know what it is:
import os
os.getcwd()
and if you want to change the current directory:
os.chdir('/some/new/path')
~Ethan~
--
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Re: Use cookies from a script in a browser
You can use mechanize, which holds a cookie jar and can user the browser cookies as well. -- http://mail.python.org/mailman/listinfo/python-list
Re: Reading/Writing files
Jack, thanks. Alright, so what I did is create a file called hello.txt with a single line of text in there. I then did the following: f=fulldirectory\hello.txt (where fulldirectory is of course the actual full directory on my computer) open(f, w) And I get the following error: IOError: [Errno 13] Permission denied: 'f' If I open to read, I get: IOError: [Errno 2] No such file or directory: 'f' Can anyone explain to me why this happens? On Fri, Mar 18, 2011 at 3:50 PM, Jack Trades jacktradespub...@gmail.comwrote: On Fri, Mar 18, 2011 at 4:33 PM, Jon Herman jfc.her...@gmail.com wrote: Hello all, I am pretty new to Python and am trying to write data to a file. However, I seem to be misunderstanding how to do so. For starters, I'm not even sure where Python is looking for these files or storing them. The directories I have added to my PYTHONPATH variable (where I import modules from succesfully) does not appear to be it. So my question is: How do I tell Python where to look for opening files, and where to store new files? Thanks, Jon By default Python will read and write files from the directory that your program is run from. This cannot always be relied upon though (for instance if your program was imported as a module from another program). To find out what directory your program is currently in use os.getcwd(). Here's an example I just ran... import os os.getcwd() '/media/DATA/code/lispy/liSpy' The folder that is returned from os.getcwd() is the folder that open will use. You can specify another folder by giving the full path. open(/full/path/to/file.txt, w) PYTHONPATH is for importing modules, which is a separate concern. -- Jack Trades Pointless Programming Blog http://pointlessprogramming.wordpress.com -- http://mail.python.org/mailman/listinfo/python-list
Re: Reading/Writing files
On Fri, Mar 18, 2011 at 4:56 PM, Jon Herman jfc.her...@gmail.com wrote: Jack, thanks. Alright, so what I did is create a file called hello.txt with a single line of text in there. I then did the following: f=fulldirectory\hello.txt (where fulldirectory is of course the actual full directory on my computer) open(f, w) And I get the following error: IOError: [Errno 13] Permission denied: 'f' If I open to read, I get: IOError: [Errno 2] No such file or directory: 'f' Can anyone explain to me why this happens? You need to remove the quotes from f. f is a variable name, not a string, so there should be no quotes around it. -- Jack Trades Pointless Programming Blog http://pointlessprogramming.wordpress.com -- http://mail.python.org/mailman/listinfo/python-list
Re: Reading/Writing files
For open() or os.open(), it should look in your Current Working Directory (CWD). Your python's CWD defaults to what the CWD was when python was started, and it is changed with os.chdir(). Absolute paths will of course be relative to / on most OS's (or C:/ if you're on C:, D:/ if you're on D:, etc. - IOW Windows is more complicated), and relative paths will be relative to your CWD. On Fri, Mar 18, 2011 at 2:33 PM, Jon Herman jfc.her...@gmail.com wrote: Hello all, I am pretty new to Python and am trying to write data to a file. However, I seem to be misunderstanding how to do so. For starters, I'm not even sure where Python is looking for these files or storing them. The directories I have added to my PYTHONPATH variable (where I import modules from succesfully) does not appear to be it. So my question is: How do I tell Python where to look for opening files, and where to store new files? Thanks, Jon -- http://mail.python.org/mailman/listinfo/python-list -- http://mail.python.org/mailman/listinfo/python-list
Re: Reading/Writing files
On Fri, Mar 18, 2011 at 4:59 PM, Jack Trades jacktradespub...@gmail.comwrote: On Fri, Mar 18, 2011 at 4:56 PM, Jon Herman jfc.her...@gmail.com wrote: Jack, thanks. Alright, so what I did is create a file called hello.txt with a single line of text in there. I then did the following: f=fulldirectory\hello.txt (where fulldirectory is of course the actual full directory on my computer) open(f, w) And I get the following error: IOError: [Errno 13] Permission denied: 'f' If I open to read, I get: IOError: [Errno 2] No such file or directory: 'f' Can anyone explain to me why this happens? You need to remove the quotes from f. f is a variable name, not a string, so there should be no quotes around it. -- Jack Trades Pointless Programming Blog http://pointlessprogramming.wordpress.com Sorry I should have given an example. From your code it should look like this... filename = fulldirectory\hello.txt You then use f to write or read. This is how you read... f = open(filename, r) file_contents = f.read() f.close() and this is how you write... f = open(filename, w) f.write(hello world) f.close() -- Jack Trades Pointless Programming Blog http://pointlessprogramming.wordpress.com -- http://mail.python.org/mailman/listinfo/python-list
Re: Reading/Writing files
Are you on windows? You probably should use / as your directory separator in Python, not \. In Python, and most other programming languages, \ starts an escape sequence, so to introduce a literal \, you either need to prefix your string with r (r\foo\bar) or double your backslashes (\\foo\\bar). / works fine on windows, and doesn't require escaping (/foo/bar). On Fri, Mar 18, 2011 at 2:56 PM, Jon Herman jfc.her...@gmail.com wrote: Jack, thanks. Alright, so what I did is create a file called hello.txt with a single line of text in there. I then did the following: f=fulldirectory\hello.txt (where fulldirectory is of course the actual full directory on my computer) open(f, w) And I get the following error: IOError: [Errno 13] Permission denied: 'f' If I open to read, I get: IOError: [Errno 2] No such file or directory: 'f' Can anyone explain to me why this happens? On Fri, Mar 18, 2011 at 3:50 PM, Jack Trades jacktradespub...@gmail.comwrote: On Fri, Mar 18, 2011 at 4:33 PM, Jon Herman jfc.her...@gmail.com wrote: Hello all, I am pretty new to Python and am trying to write data to a file. However, I seem to be misunderstanding how to do so. For starters, I'm not even sure where Python is looking for these files or storing them. The directories I have added to my PYTHONPATH variable (where I import modules from succesfully) does not appear to be it. So my question is: How do I tell Python where to look for opening files, and where to store new files? Thanks, Jon By default Python will read and write files from the directory that your program is run from. This cannot always be relied upon though (for instance if your program was imported as a module from another program). To find out what directory your program is currently in use os.getcwd(). Here's an example I just ran... import os os.getcwd() '/media/DATA/code/lispy/liSpy' The folder that is returned from os.getcwd() is the folder that open will use. You can specify another folder by giving the full path. open(/full/path/to/file.txt, w) PYTHONPATH is for importing modules, which is a separate concern. -- Jack Trades Pointless Programming Blog http://pointlessprogramming.wordpress.com -- http://mail.python.org/mailman/listinfo/python-list -- http://mail.python.org/mailman/listinfo/python-list
Re: ctypes pointer to structure memory swap
On Mar 18, 5:48 pm, Nobody nob...@nowhere.com wrote: On Fri, 18 Mar 2011 10:34:35 -0700, Wanderer wrote: I'm observing some strange behavior with ctypes. I created this test code to try to figure out what I'm doing wrong creating pointers to structures. What makes you think that you're doing anything wrong. Note that the hex number shown when printing a ctypes object is the object's ID (as per the id() function). This is typically the address of the Python object. It is not the address of the structured data nor (in the case of a ctypes pointer) the value of the pointer. If you want to see the actual value of a ctypes pointer, cast it to c_void_p then examine the .value field, e.g.: p = pointer(x) print hex(cast(p, c_void_p).value) In the real program the pointer to the structure is passed to the DLL. The DLL has functions CreateCameraSettingsStruct and ReleaseCameraSettingsStruct. Once I call CreateCameraSettingStruct, I can't delete the pointer without crashing Python. Calling ReleaseCameraSettingStruct doesn't help. The result is the program crashes on exit during the class destruction. I was trying to figure out why ReleaseCameraSettingStruct doesn't release the pointer so Python can close the program. I was checking to see what happened before and after ReleaseCameraSettingStruct and saw this. But it happens even if I don't run ReleaseCameraSettingStruct. Thanks for the reply, but I'm still not sure I understand. Why should Object1 be at address1 and Object2 be at address2 and the next moment Object2 is at address1 and Object1 is at address2? I'll try casting them to see what the value is before and after calling ReleaseCameraSettingStruct. -- http://mail.python.org/mailman/listinfo/python-list
Re: Reading/Writing files
On 18.03.2011 22:33, Jon Herman wrote: Hello all, I am pretty new to Python and am trying to write data to a file. However, I seem to be misunderstanding how to do so. For starters, I'm not even sure where Python is looking for these files or storing them. The directories I have added to my PYTHONPATH variable (where I import modules from succesfully) does not appear to be it. So my question is: How do I tell Python where to look for opening files, and where to store new files? Thanks, Jon There is no special place where Python looks for normal files (PYTHONPATH is just tells where to look for modules.) If you open a file (for reading and/or writing) and don't give an absolute path, then the filename is relative to the CWD (Current Working Directory). One can change this directory with os.chdir() *but* you shouldn't need to do that. Either start Python in the desired directory (your operating system will have a way to do this for icons and menu entries) or give an absolute path like: f = open(/home/alex/test.txt) f = open(c:/test.txt) Also check out os.environ, a dict containing the environment variables. There you will find variables like $HOME or %USERPROFILE% (if that's correct) which tells where your personal files are: import os # my home directory is /home/alex homedir = os.environ[HOME] # creates the file /home/alex/test.txt f = open(os.path.join(homedir, test.txt)) -- http://mail.python.org/mailman/listinfo/python-list
Re: Reading/Writing files
Folks, thanks for the many responses! Specifying the full file name (and not using parentheses when inappropriate, thanks Jack :)) I am now happily reading/writing files. My next question: what is the best way for me to write an array I generated to a file? And what is the best way for me to load that array again, the next time I start up my computer? Basically I am doing very large computations and want to store the results. Thanks a lot guys! Jon On Fri, Mar 18, 2011 at 4:18 PM, Dan Stromberg drsali...@gmail.com wrote: Are you on windows? You probably should use / as your directory separator in Python, not \. In Python, and most other programming languages, \ starts an escape sequence, so to introduce a literal \, you either need to prefix your string with r (r\foo\bar) or double your backslashes (\\foo\\bar). / works fine on windows, and doesn't require escaping (/foo/bar). On Fri, Mar 18, 2011 at 2:56 PM, Jon Herman jfc.her...@gmail.com wrote: Jack, thanks. Alright, so what I did is create a file called hello.txt with a single line of text in there. I then did the following: f=fulldirectory\hello.txt (where fulldirectory is of course the actual full directory on my computer) open(f, w) And I get the following error: IOError: [Errno 13] Permission denied: 'f' If I open to read, I get: IOError: [Errno 2] No such file or directory: 'f' Can anyone explain to me why this happens? On Fri, Mar 18, 2011 at 3:50 PM, Jack Trades jacktradespub...@gmail.comwrote: On Fri, Mar 18, 2011 at 4:33 PM, Jon Herman jfc.her...@gmail.comwrote: Hello all, I am pretty new to Python and am trying to write data to a file. However, I seem to be misunderstanding how to do so. For starters, I'm not even sure where Python is looking for these files or storing them. The directories I have added to my PYTHONPATH variable (where I import modules from succesfully) does not appear to be it. So my question is: How do I tell Python where to look for opening files, and where to store new files? Thanks, Jon By default Python will read and write files from the directory that your program is run from. This cannot always be relied upon though (for instance if your program was imported as a module from another program). To find out what directory your program is currently in use os.getcwd(). Here's an example I just ran... import os os.getcwd() '/media/DATA/code/lispy/liSpy' The folder that is returned from os.getcwd() is the folder that open will use. You can specify another folder by giving the full path. open(/full/path/to/file.txt, w) PYTHONPATH is for importing modules, which is a separate concern. -- Jack Trades Pointless Programming Blog http://pointlessprogramming.wordpress.com -- http://mail.python.org/mailman/listinfo/python-list -- http://mail.python.org/mailman/listinfo/python-list
Re: Reading/Writing files
On Fri, Mar 18, 2011 at 5:21 PM, Jon Herman jfc.her...@gmail.com wrote: Folks, thanks for the many responses! Specifying the full file name (and not using parentheses when inappropriate, thanks Jack :)) I am now happily reading/writing files. My next question: what is the best way for me to write an array I generated to a file? And what is the best way for me to load that array again, the next time I start up my computer? Basically I am doing very large computations and want to store the results. Thanks a lot guys! Jon To save a data structure like an array (called a list in Python), you can use the pickle module. Here's the documentation on pickle. http://docs.python.org/library/pickle.html http://www.developertutorials.com/tutorials/python/python-persistence-management-050405-1306/ -- Jack Trades Pointless Programming Blog http://pointlessprogramming.wordpress.com -- http://mail.python.org/mailman/listinfo/python-list
Re: Use cookies from a script in a browser
On 18 Mar, 22:52, Miki Tebeka miki.teb...@gmail.com wrote: You can use mechanize, which holds a cookie jar and can user the browser cookies as well. I use: opener = urllib.request.build_opener(urllib.request.HTTPCookieProcessor()) urllib.request.install_opener(opener) I start scraping from http://page.com/home.html that need the cookies enabled, then, once I found what I was looking for, I've got http://page.com/pageX.html and http://page.com/pageY.html. Those page cannot be viewed if I just copy paste the url in the browser, because they need the cookies. What can I do? Thanks, Mattia -- http://mail.python.org/mailman/listinfo/python-list
Re: Reading/Writing files
On Fri, 2011-03-18 at 15:56 -0600, Jon Herman wrote: Jack, thanks. Alright, so what I did is create a file called hello.txt with a single line of text in there. I then did the following: f=fulldirectory\hello.txt (where fulldirectory is of course the actual full directory on my computer) open(f, w) And I get the following error: IOError: [Errno 13] Permission denied: 'f' If I open to read, I get: IOError: [Errno 2] No such file or directory: 'f' Can anyone explain to me why this happens? On Fri, Mar 18, 2011 at 3:50 PM, Jack Trades jacktradespub...@gmail.com wrote: On Fri, Mar 18, 2011 at 4:33 PM, Jon Herman jfc.her...@gmail.com wrote: Hello all, I am pretty new to Python and am trying to write data to a file. However, I seem to be misunderstanding how to do so. For starters, I'm not even sure where Python is looking for these files or storing them. The directories I have added to my PYTHONPATH variable (where I import modules from succesfully) does not appear to be it. So my question is: How do I tell Python where to look for opening files, and where to store new files? Thanks, Jon By default Python will read and write files from the directory that your program is run from. This cannot always be relied upon though (for instance if your program was imported as a module from another program). To find out what directory your program is currently in use os.getcwd(). Here's an example I just ran... import os os.getcwd() '/media/DATA/code/lispy/liSpy' The folder that is returned from os.getcwd() is the folder that open will use. You can specify another folder by giving the full path. open(/full/path/to/file.txt, w) PYTHONPATH is for importing modules, which is a separate concern. -- Jack Trades Pointless Programming Blog Don't put f in quotes. That would just make the string literal 'f'. -- http://mail.python.org/mailman/listinfo/python-list
Re: Bounds checking
Don't check for bounds, fix any bug in the code that would set your
values out of bounds and use asserts while debugging.
whilst that is a nice idea in practice this just is not a practical
solution.
Otherwise if you really need dynamic checks, it will cost you cpu, for
sure.
Yes I agree and I hadn't decided whether to add it or not as there
aren't any current issues. However I can see that the check would
overall be safer. I was just wondering if there was some super smartie
pants solution :P
Howeverver you could for instance override the __setatttr__ of
state object, and call the attribute's associated function.
class State(object):
funcTable = {
'foo': lambda x: x = 0.0
}
def __init__(self):
self.foo = 0
def __setattr__(self, attribute, value):
if not self.funcTable.get(attribute, lambda x: True)(value):
sys.exit('error out of bound')
return object.__setattr(self, attribute, value)
Untested, however it's just an idea. I'm not even sure that would be
less cpu consuming :D
thanks I will look at what you suggested.
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Re: Bounds checking
Offhand, my only quibble is that sys.exit is not helpful for debugging.
Much better to raise an error:
if not self.funcTable.get(attribute, lambda x: True)(value):
raise ValueError ('error out of bound')
or define a subclass of ValueError just for this purpose. On error, the
program will stop just as dead, but you'll get a trace.
Mel.
I think generally I prefer my code to die and as long as I know where
(from the statement) the error occurred I know generally what point I
have to debug up until. Can you explain how your solution would be
easier with a trace as I don't tend to use the raise/assert
functionality so I am interested.
thanks
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Re: ctypes pointer to structure memory swap
On Fri, 18 Mar 2011 15:16:40 -0700, Wanderer wrote: Thanks for the reply, but I'm still not sure I understand. Why should Object1 be at address1 and Object2 be at address2 and the next moment Object2 is at address1 and Object1 is at address2? I'll try casting them to see what the value is before and after calling ReleaseCameraSettingStruct. QCamSettingsEx is a ctypes Struct object. The pSettingsID field is a ctypes field, not a Python field. It will contain a bare pointer to the C-struct for the QCamSettingId object. The point of a ctypes Struct is to store data in a format usable by C code, i.e. the memory layout will match that of a C struct. In particular, pointers within that struct will be pointers to C-compatible data (e.g. C structs), not pointers to Python objects. If you access the fields from Python, ctypes will generate Python objects on-the-fly from the raw data. Whenever you read the pSettingsID field, ctypes will generate a ctypes pointer object (LP_QCamSettingId?) which wraps the underlying C pointer. If you dereference that, ctypes will generate a Python QCamSettingId object which wraps the C struct. As you aren't storing the references, as soon as the print statement completes, the reference count will drop to zero and the object will be deallocated. The next time you reference pSettingsID or pSettingsID[0], a new object will be constructed. The addresses (and thus IDs) of the Python objects are entirely arbitrary. -- http://mail.python.org/mailman/listinfo/python-list
Re: Reading/Writing files
Dan Stromberg wrote:
Are you on windows?
You probably should use / as your directory separator in Python, not \.
In Python, and most other programming languages, \ starts an escape
sequence, so to introduce a literal \, you either need to prefix your
string with r (r\foo\bar) or double your backslashes (\\foo\\bar).
/ works fine on windows, and doesn't require escaping (/foo/bar).
Depends on your definition of 'fine'.
-- from glob import glob
-- from pprint import pprint as pp
-- pp(glob('c:/temp/*.pdf'))
['c:/temp\\choose_python.pdf',
'c:/temp\\COA.pdf',
'c:/temp\\job_setup.pdf']
Visually ugly, and a pain to compare files and paths.
~Ethan~
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Re: Reading/Writing files
On Fri, 2011-03-18 at 15:18 -0700, Dan Stromberg wrote: Are you on windows? badadvice / You shouldn't use / or \ on Windows. You should use os.path.join(). On Windows, when you start mixing / with \\ and spaces things can get hairy and obscure. It's always best to just use os.path.join(). -- http://mail.python.org/mailman/listinfo/python-list
Re: Bounds checking
Actually, I'd probably create a class with 3 arguments - an initial value, a
lower bound, and an upper bound, give it a _check method, and call _check
from the various operator methods. The class would otherwise impersonate an
int.
In code that isn't performance-critical, it's better to check for errors on
a level that seems excessive to many; this is how I like to program - it
tends to stop bugs in their tracks, rather than allowing them to manifest
somewhere far away, elsewhere in the code, yielding a potentially
time-consuming bug chase. So I'll have if's and asserts checking
assumptions everywhere - at the beginning of a callable, at the end, in the
middle - inspired by Eiffel's heavy assumption checking.
Python code doesn't need to be troublesome. I'm told this is how a famous
chess engine (was it Crafty?) got pretty much all of its bugs out.
Or if things don't need to be in the correct range every step of the way (or
rather, if they must be able to temporarily step outside their bounds), then
you could make self._check() be self.check(), and call it externally on an
as-needed basis instead.
Performance-oriented programming is fun, but not all programming is
performance-oriented, and shouldn't be treated as though it is.
On Fri, Mar 18, 2011 at 7:24 AM, Martin De Kauwe mdeka...@gmail.com wrote:
Hi,
if one has a set of values which should never step outside certain
bounds (for example if the values were negative then they wouldn't be
physically meaningful) is there a nice way to bounds check? I
potentially have 10 or so values I would like to check at the end of
each iteration. However as the loop is over many years I figured I
probably want to be as optimal as possible with my check. Any
thoughts?
e.g. this is my solution
# module contain data
# e.g. print state.something might produce 4.0
import state as state
def main():
for i in xrange(num_days):
# do stuff
# bounds check at end of iteration
bounds_check(state)
def bounds_check(state):
check state values are 0
for attr in dir(state):
if not attr.startswith('__') and getattr(state, attr) 0.0:
print Error state values 0: %s % (attr)
sys.exit()
if __name__ == __main__:
sys.exit(main())
thanks
Martin
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Re: Reading/Writing files
Wow, Jack, that is one awesome and simple module...thank you so much! I am happily storing and accessing all the arrays I could ever want :) Thanks to all for the quick assistance! On Fri, Mar 18, 2011 at 4:24 PM, Jack Trades jacktradespub...@gmail.comwrote: On Fri, Mar 18, 2011 at 5:21 PM, Jon Herman jfc.her...@gmail.com wrote: Folks, thanks for the many responses! Specifying the full file name (and not using parentheses when inappropriate, thanks Jack :)) I am now happily reading/writing files. My next question: what is the best way for me to write an array I generated to a file? And what is the best way for me to load that array again, the next time I start up my computer? Basically I am doing very large computations and want to store the results. Thanks a lot guys! Jon To save a data structure like an array (called a list in Python), you can use the pickle module. Here's the documentation on pickle. http://docs.python.org/library/pickle.html http://www.developertutorials.com/tutorials/python/python-persistence-management-050405-1306/ -- Jack Trades Pointless Programming Blog http://pointlessprogramming.wordpress.com -- http://mail.python.org/mailman/listinfo/python-list
Re: multiprocessing Pool workers cannot create subprocesses
On 3/18/11 3:29 PM, Ned Deily wrote: In article4d838d28.5090...@creativetrax.com, Jason Groutjason-pyt...@creativetrax.com wrote: The problem appears to be that multiprocessing sets its workers to have the daemon flag set to True, which prevents workers from creating child processes. If I uncomment the line indicated in the code, I can create child processes and the program works (it prints out the even numbers from 0 to 18). It makes me nervous to just change the daemon status of the process like that, especially when I don't know the reason the workers have daemon=True to begin with. What is the reasoning behind that decision? What issues do we need to worry about if we just set the daemon mode flag like in the above code? http://docs.python.org/library/multiprocessing.html#multiprocessing.Proce ss.daemon When a process exits, it attempts to terminate all of its daemonic child processes. Note that a daemonic process is not allowed to create child processes. Otherwise a daemonic process would leave its children orphaned if it gets terminated when its parent process exits. Additionally, these are not Unix daemons or services, they are normal processes that will be terminated (and not joined) if non-daemonic processes have exited. Right; thanks. Let me rephrase my questions: 1. Why is important that the multiprocessing Pool worker processors have daemon=True (I think this is the same as asking: why is it important that they be terminated with terminate() rather than join() )? 2. Is it safe for us to reset a Pool worker process to have daemon=False before starting a subprocess from that worker, like in the code from the original message? Thanks, Jason -- http://mail.python.org/mailman/listinfo/python-list
SocketServer.BaseRequestHandler has the data, and now?
Hello, I wrote a test application to play around with UDP, the receiving part looks like: class proxyServer(SocketServer.ThreadingMixIn, SocketServer.UDPServer): pass class proxyHandler(SocketServer.BaseRequestHandler): def handle(self): data = self.request[0] source = self.request[1] cur_thread = threading.currentThread() response = %s - %s: %s % (cur_thread.getName(), source, data) print response class proxy(process) : def __init__(self, id, context) : process.__init__(self, id, context, self.run()) self.server = proxyServer((, 58889), proxyHandler) self.thread = threading.Thread(target=self.server.serve_forever) self.thread.setDaemon(True) def __del__(self) : if self.server != None : self.server.shutdown() def run(self) : self.context.model.register(self) self.thread.start() ... ... ... def notify(self) : print notify + str(self.id) So far so good, but how do I get the data back from the handle method to somewhere else? In my case I yust would like to add every incoming datagram to a queue and process it later in a different thread. How do I hand over the queue to the class proxyHandler(SocketServer.BaseRequestHandler)? thanks, AO -- http://mail.python.org/mailman/listinfo/python-list
Re: Abend with cls.__repr__ = cls.__str__ on Windows.
On Mar 18, 2:15 pm, Carl Banks pavlovevide...@gmail.com wrote: Multiple people reproduce a Python hang/crash yet it looks like no one bothered to submit a bug report I observed the same behavior (2.6 and 3.2 on Linux, hangs) and went ahead and submitted a bug report. Carl Banks Speaking for myself, I've only put in one bug report on an OSS project. Won't do it again. Firefox, some kinda attribute works with html, but blows up on xhtml issue. Nothing that was really xhtml related, but their Bugzilla folks pulled out some unconvincing RFC crap claiming that it was out of scope for xhtml as opposed to html so they wouldn't fix it. Their choice. 4 yrs ago. Still getting occasional emails from Bugzilla about that we won't fix it for you bug. At least 2 dozen over the years. Nothing about fixing it, just status churn. If I ever specifically work on an OSS project's codeline, I'll post bug reports, but frankly that FF example is a complete turn-off to contributing by reporting bugs. -- http://mail.python.org/mailman/listinfo/python-list
Re: Abend with cls.__repr__ = cls.__str__ on Windows.
On 3/18/2011 5:15 PM, Carl Banks wrote: Multiple people reproduce a Python hang/crash yet it looks like no one bothered to submit a bug report I did not because I did not initially see a problem... I observed the same behavior (2.6 and 3.2 on Linux, hangs) and went ahead and submitted a bug report. http://bugs.python.org/issue11603 where I added additional comments. -- Terry Jan Reedy -- http://mail.python.org/mailman/listinfo/python-list
Re: Reading/Writing files
On Fri, Mar 18, 2011 at 4:00 PM, Ethan Furman et...@stoneleaf.us wrote:
Dan Stromberg wrote:
Are you on windows?
You probably should use / as your directory separator in Python, not \.
In Python, and most other programming languages, \ starts an escape
sequence, so to introduce a literal \, you either need to prefix your string
with r (r\foo\bar) or double your backslashes (\\foo\\bar).
/ works fine on windows, and doesn't require escaping (/foo/bar).
Depends on your definition of 'fine'.
-- from glob import glob
-- from pprint import pprint as pp
-- pp(glob('c:/temp/*.pdf'))
['c:/temp\\choose_python.pdf',
'c:/temp\\COA.pdf',
'c:/temp\\job_setup.pdf']
Visually ugly, and a pain to compare files and paths.
I argue that the first is quite a bit more readable than the second:
'c:/temp/choose_python.pdf'
os.path.join([ 'c:', 'temp', 'choose_python.pdf' ])
Also, heard of os.path.normpath? You probably shouldn't compare pathnames
without it.
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Re: Abend with cls.__repr__ = cls.__str__ on Windows.
On Mar 18, 5:31 pm, J Peyret jpey...@gmail.com wrote: If I ever specifically work on an OSS project's codeline, I'll post bug reports, but frankly that FF example is a complete turn-off to contributing by reporting bugs. You probably shouldn't take it so personally if they don't agree with you. But it's ok, it's not unreasonable to call attention to (actual) bugs here. I was surprised, though, when several people confirmed but no one reported it, especially since it was a crash, which is quite a rare thing to find. (You should feel proud.) Carl Banks -- http://mail.python.org/mailman/listinfo/python-list
Re: class error
On 3/18/2011 5:27 PM, monkeys paw wrote:
TypeError: Error when calling the metaclass bases
module.__init__() takes at most 2 arguments (3 given)
OK, i overlooked that and the error was not very enlightening.
A detailed explanation: every module is an instance of a class we will
call Module. Every class is an instance of some class, its metaclass.
The default metaclass, in the absence of any indication otherwise, is
class type. So your class statement was translated to
type('FileInfo',(UserDict,), d)
where d is a dict mappint '__init__' to the function object.
type.__new__ checks the types (metaclasses) of each of the base classes.
In particular, it sees that type(UxerDict) is Module, not type. Since it
assumed that UserDict is a class (since you said it was), it assumed
that Module is a proper metaclass and called
Module('FileInfo',(UserDict,), d)
But Module is not a metaclass and does not expect the tuple of base
classes, and Module.__new__ passed too much to Module.__init__.
Since others have made the same mistake, I opened an issue to improve
the message.
http://bugs.python.org/issue11604
--
Terry Jan Reedy
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Re: Bounds checking
On 3/18/2011 10:24 AM, Martin De Kauwe wrote:
def bounds_check(state):
check state values are 0
for attr in dir(state):
if not attr.startswith('__') and getattr(state, attr) 0.0:
print Error state values 0: %s % (attr)
dir() has to do a bit a computation. I would be tempted to give 'state'
a set of attributes to check. Call it 'nonnegatives'.
for attr in nonnegatives:
if ...
This allows for attributes not subject to that check.
--
Terry Jan Reedy
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How to install python xlwt in ubuntu 9
Hey friends i tried a lot to unstall excel xlwt in ubuntu 9 but failed please help me before i get full fraustrated... -- http://mail.python.org/mailman/listinfo/python-list
Syntax Error
I hope this is the place to post this question. I am a really new pythonista. I am studying Tkinter and when I run this basic code, I get a syntax error on line 20, print hi there, everyone. Its a simple print line, but I can't see the problem. I am using Python 2.71, gVim for an editor, and a console window to execute the program. Here is the link to the website that I am trying to follow: http://www.pythonware.com/library/tkinter/introduction/hello-again.htm Thanks for any help. # File: hello2.py from Tkinter import * class App: def __init__(self, master): frame = Frame(master) frame.pack() self.button = Button(frame, text=QUIT, fg=red, command=frame.quit) self.button.pack(side=LEFT) self.hi_there = Button(frame, text=Hello, command=self.say_hi) self.hi_there.pack(side=LEFT) def say_hi(self): print hi there, everyone root = Tk() app = App(root) root.mainloop() -- http://mail.python.org/mailman/listinfo/python-list
Re: Syntax Error
On Friday 2011 March 18 21:39, Manatee wrote: I hope this is the place to post this question. I am a really new pythonista. I am studying Tkinter and when I run this basic code, I get a syntax error on line 20, print hi there, everyone. Its a simple print line, but I can't see the problem. I am using Python 2.71, gVim for an editor, and a console window to execute the program. Here is the link to the website that I am trying to follow: http://www.pythonware.com/library/tkinter/introduction/hello-again.htm Thanks for any help. # File: hello2.py from Tkinter import * class App: def __init__(self, master): frame = Frame(master) frame.pack() self.button = Button(frame, text=QUIT, fg=red, command=frame.quit) self.button.pack(side=LEFT) self.hi_there = Button(frame, text=Hello, command=self.say_hi) self.hi_there.pack(side=LEFT) def say_hi(self): print hi there, everyone root = Tk() app = App(root) root.mainloop() Post the complete traceback. -- I have seen the future and I am not in it. -- http://mail.python.org/mailman/listinfo/python-list
Re: Syntax Error
At 11:39 PM 3/18/2011, Manatee wrote: I hope this is the place to post this question. I am a really new pythonista. I am studying Tkinter and when I run this basic code, I get a syntax error on line 20, print hi there, everyone. Its a simple print line, but I can't see the problem. I am using Python 2.71, gVim for an editor, and a console window to execute the program. Here is the link to the website that I am trying to follow: http://www.pythonware.com/library/tkinter/introduction/hello-again.htm Thanks for any help. No help, really, but copy-n-paste of the below ran fine first time on 2.7 install on Win7. Maybe accidental special characters in source file? How about you also try copy-n-paste from your email? Who knows :-) # File: hello2.py from Tkinter import * class App: def __init__(self, master): frame = Frame(master) frame.pack() self.button = Button(frame, text=QUIT, fg=red, command=frame.quit) self.button.pack(side=LEFT) self.hi_there = Button(frame, text=Hello, command=self.say_hi) self.hi_there.pack(side=LEFT) def say_hi(self): print hi there, everyone root = Tk() app = App(root) root.mainloop() -- http://mail.python.org/mailman/listinfo/python-list -- http://mail.python.org/mailman/listinfo/python-list
Re: Syntax Error
2011/3/19 Manatee markrri...@aol.com: I hope this is the place to post this question. I am a really new pythonista. I am studying Tkinter and when I run this basic code, I get a syntax error on line 20, print hi there, everyone. Its a simple print line, but I can't see the problem. I am using Python 2.71, gVim for an editor, and a console window to execute the program. Here is the link to the website that I am trying to follow: http://www.pythonware.com/library/tkinter/introduction/hello-again.htm Thanks for any help. [...] Hi, the code on the mentioned page as well as yours (with adapted indentation and wordwrapping from the mail) seems ok for python 2. Is it possible, that you are actually using python3? This would give something like print hi there, everyone! ^ SyntaxError: invalid syntax as print was changed to a funcion in this version. print(hi there, everyone!) hth, vbr -- http://mail.python.org/mailman/listinfo/python-list
Re: Abend with cls.__repr__ = cls.__str__ on Windows.
On Mar 18, 6:55 pm, Carl Banks pavlovevide...@gmail.com wrote: On Mar 18, 5:31 pm, J Peyret jpey...@gmail.com wrote: If I ever specifically work on an OSS project's codeline, I'll post bug reports, but frankly that FF example is a complete turn-off to contributing by reporting bugs. You probably shouldn't take it so personally if they don't agree with you. But it's ok, it's not unreasonable to call attention to (actual) bugs here. No, I didn't take the refusal personally at all, though it seemed kinda glib to xhtml-not-hmtl out of a bug. Such is life. What I object to is getting auto-spammed for years after that because I was silly enough to enter my email on their database and then being notified about every single event on that bug. I was surprised, though, when several people confirmed but no one reported it, especially since it was a crash, which is quite a rare thing to find. (You should feel proud.) Carl Banks Yes, that's why I reported it. Python is extremely stable so it seemed worthwhile. And I figured someone on the list would know its bug quotient. Impressed that there is already a bit of a proposed approach on the entry to fix it, you guys are great. But... I rather thought __repr__ was going to disappear in 3.x, with just __str__ sticking around. -- http://mail.python.org/mailman/listinfo/python-list
[issue11592] Compilation warnings in os module
Changes by Ross Lagerwall rosslagerw...@gmail.com: -- resolution: - fixed stage: - committed/rejected status: open - closed ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue11592 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue11320] Can't call Py_SetPath() on pointer returned by Py_GetPath()
Palm Kevin kevin.p...@labsolution.lu added the comment: Antoine, Your guess that my issue initially wasn't related to virtualenv is correct (I've never heard about that project before posting this issue...) As for passing the output of Py_GetPath directly to Py_SetPath: You are right, there is no point in doing this... Now, I remember that the initial problem I had was the one you reported: Fatal Python error: Py_Initialize: Unable to get the locale encoding LookupError: no codec search functions registered: can't find encoding Shall I create a separate issue to report this problem? -- ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue11320 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue11320] Can't call Py_SetPath() on pointer returned by Py_GetPath()
Palm Kevin kevin.p...@labsolution.lu added the comment: Furthermore I would propose to rename this issue: The problem is not that Py_SetPath cannot be called on pointer returned by Py_GetPath. I think that the problem is more general: Calling Py_SetPath NEVER works. -- I get the same exception as documented in my initial post when calling Py_SetPyth like this: Py_SetPath(L/usr/labsolution/python32/lib/python3.2/); or like this: wchar_t * path; path = malloc(128 * sizeof(wchar_t)); wcscpy(path,L/usr/labsolution/python32/lib/python3.2/); Py_SetPath(path); -- ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue11320 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue11320] Can't call Py_SetPath() on pointer returned by Py_GetPath()
Palm Kevin kevin.p...@labsolution.lu added the comment: As for this error: Fatal Python error: Py_Initialize: Unable to get the locale encoding LookupError: no codec search functions registered: can't find encoding It seems to me that this error appears if the path passed to Py_SetPath does not point to a valid python lib folder. -- ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue11320 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue11593] Add encoding parameter to logging.basicConfig
Vinay Sajip vinay_sa...@yahoo.co.uk added the comment: I've been thinking about adding a handler= keyword argument to basicConfig(), and it seems to me that it would not only cover your use case, but also other cases which require different handlers. So I'm marking as wontfix for now, but I'll keep the issue open until the handler parameter gets added. Also changing this to Python 3.3, as I can't make API changes to 3.2. -- assignee: - vinay.sajip resolution: - wont fix versions: +Python 3.3 -Python 3.2 ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue11593 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue11572] bring Lib/copy.py to 100% coverage
Éric Araujo mer...@netwok.org added the comment: A little research has found that building without complex is not possible anymore, so you’re good: http://bugs.python.org/issue7147 Regarding “unicode”, see line 112. -- ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue11572 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue10914] Python sub-interpreter test
Éric Araujo mer...@netwok.org added the comment: Well, config._link() seems to do what is needed here. My point is that it’s easier to write a few lines of code directly using a compiler object (copying and simplifying code from try_run or _link) than go through the distutils command machinery. Both are doable, but I think the former is easier. -- ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue10914 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue11591] python -S should be robust against e.g. from site import addsitedir
Éric Araujo mer...@netwok.org added the comment: Fair argument. Brett is the author of recent changes in site, let him decide. Brett: Would you agree to 1)? -- nosy: +brett.cannon ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue11591 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue1195] Problems on Linux with Ctrl-D and Ctrl-C during raw_input
STINNER Victor victor.stin...@haypocalc.com added the comment:
Instead of always calling clearerr(), we can only call it on EOF:
diff -r 88fe1ac48460 Parser/myreadline.c
--- a/Parser/myreadline.c Mon Mar 07 08:31:52 2011 +0100
+++ b/Parser/myreadline.c Fri Mar 18 10:57:23 2011 +0100
@@ -72,6 +72,7 @@
}
#endif /* MS_WINDOWS */
if (feof(fp)) {
+clearerr(fp);
return -1; /* EOF */
}
#ifdef EINTR
This patch works around this issue.
--
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[issue11320] Can't call Py_SetPath() on pointer returned by Py_GetPath()
Antoine Pitrou pit...@free.fr added the comment: As for this error: Fatal Python error: Py_Initialize: Unable to get the locale encoding LookupError: no codec search functions registered: can't find encoding It seems to me that this error appears if the path passed to Py_SetPath does not point to a valid python lib folder. Indeed, it does. The error message could perhaps get improved. What Python does is try to find the current locale's encoding in the encodings package and load it. If it can't find it, it assumes that's because the encoding is unknown, not because the path is wrong. -- ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue11320 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue11575] addresses.txt file leaks into search engines
Senthil Kumaran orsent...@gmail.com added the comment: Why should we have this file served on the web itself? Cannot it be on server outside of www ( or any directory which is getting served). I would vote for this. -- nosy: +orsenthil ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue11575 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue11575] addresses.txt file leaks into search engines
Antoine Pitrou pit...@free.fr added the comment: The question is not why, it is how. This file is part of the scripts used to migrate from svn to hg. These files themselves were maintained in an hg repository (it could have been an svn repository), for obvious practical reasons. And that repository was online since there didn't seem any reason to do otherwise (and, again, it's more practical). We could of course make this repo less visible now (but I think we still need to migrate the peps repo). Georg? -- ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue11575 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue11549] Rewrite peephole to work on AST
Changes by Mark Dickinson dicki...@gmail.com: -- nosy: +mark.dickinson ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue11549 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue11574] Unicode Fallback Encoding on Python 3.3
STINNER Victor victor.stin...@haypocalc.com added the comment: After reading the related mail thread on python-dev, I realized that you are talking about TextIOWrapper choice (file content, not file name). My previous message is about file names. -- ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue11574 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue11572] bring Lib/copy.py to 100% coverage
Brandon Craig Rhodes bran...@rhodesmill.org added the comment: Éric, after checking line 112 of the two patches and then of the new file, I figured out that you meant line 112 of the old file — and, yes, that test can go away too since in python3 complex always exists and unicode never exists. A further improved patch (#3) is attached. -- Added file: http://bugs.python.org/file21276/test_copy3.patch ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue11572 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue11574] Unicode Fallback Encoding on Python 3.3
STINNER Victor victor.stin...@haypocalc.com added the comment: TextIOWrapper is mostly based on locale.getpreferredencoding(), so msg131290 is still valid: if no env var is set, nl_langinfo() gives 'ASCII' (or something like that). But it is not easy to detect that env vars are not set. I would prefer a completly different approach: always use UTF-8 by default if the encoding is not set. Something like: def open(filename, ..., encoding='UTF-8', ...) TextIOWrapper.__init__(..., encoding='UTF-8', ...) So not rely on locales anymore. -- ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue11574 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue11581] buildbot error when pushing to 2.5 branch?
R. David Murray rdmur...@bitdance.com added the comment: I talked to Martin. He wants the 2.5 mercurial branch to get *exactly* that set of changes that needs to be applied to the svn repository in order for him to build the security release, no more no less. Note that 2.5 goes out of security maintenance in November. -- nosy: +r.david.murray ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue11581 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue11581] buildbot error when pushing to 2.5 branch?
Senthil Kumaran orsent...@gmail.com added the comment: David, from you message I understand that Martin is planning to release 2.5 via svn. If that is the case, whatever was pushed for security fix to hg can remain as such and so that those can be exported to svn. The bugs related to buildbot and svn keyword for 2.5, can then be ignored and closed. -- ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue11581 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue11581] buildbot error when pushing to 2.5 branch?
R. David Murray rdmur...@bitdance.com added the comment: Yes, although there may be another answer on the compile bug. -- resolution: - wont fix stage: - committed/rejected status: open - closed type: - behavior ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue11581 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue11513] chained exception/incorrect exception from tarfile.open on a non-existent file
Evan Dandrea e...@ubuntu.com added the comment: David, Thanks for the pointers. I've updated the patch hopefully adequately addressing your concerns. -- components: +Interpreter Core -Library (Lib) type: behavior - Added file: http://bugs.python.org/file21277/tarfile-fix-multiple-exception-on-enoent.patch ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue11513 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue11513] chained exception/incorrect exception from tarfile.open on a non-existent file
Changes by Evan Dandrea e...@ubuntu.com: Removed file: http://bugs.python.org/file21223/tarfile-fix-multiple-exception-on-enoent.patch ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue11513 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue11579] python 2.5 does not build from hg - looks for subversion keywords
R. David Murray rdmur...@bitdance.com added the comment: I talked to Martin about this at the sprints. He wants the set of patches in the 2.5 hg repo to be exactly those that he should apply to svn to build the next release, no more no less. If someone wants to propose a patch that fixes the hg compile but does not break the svn compile, he would find that acceptable. Alternatively the hg repo could be fixed, for our convenience, after 2.5 goes out of maintenance in November. -- nosy: +r.david.murray ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue11579 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue11594] 2to3 tool does not preserve line-endings
New submission from Alexander Belchenko bia...@ukr.net: I'm using LF-only line-endings for development of my IntelHex library. I'm working on Windows most of the time. After 2to3 tool has been ran on my library it has not only changed the Python syntax, but it also saved all files with CRLF line-endings. As result I have all changed files completelly modified and diff shows change in every line. 2to3 tool should respect my line-endings and must not use simple open(xxx, wt) mode for writing modified files. -- components: 2to3 (2.x to 3.0 conversion tool) messages: 131335 nosy: bialix priority: normal severity: normal status: open title: 2to3 tool does not preserve line-endings type: behavior versions: Python 2.7, Python 3.2 ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue11594 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
