Dear pythonistas,
I am writing a tiny utility to produce a file consisting of a
specified number of lines of a given length of random ascii
characters. I am hoping to find a more time and memory efficient way,
that is still fairly simple clear, and _pythonic_.
I would like to have something
On Apr 10, 9:52 pm, Michael Torrie torr...@gmail.com wrote:
On 04/10/2013 07:21 PM, gry wrote:
from sys import stdout
from array import array
import random
nchars = 3200
rows = 10
avail_chrs =
'0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ
sys.version -- '2.6 (r26:66714, Feb 21 2009, 02:16:04) \n[GCC 4.3.2
[gcc-4_3-branch revision 141291]]
I thought this script would be very lean and fast, but with a large
value for n (like 15), it uses 26G of virtural memory, and things
start to crumble.
#!/usr/bin/env python
'''write a file
On Sep 9, 2:04 am, Terry Reedy tjre...@udel.edu wrote:
On 9/8/2011 9:09 PM, papu wrote:
Hello, I have a data file (un-structed messy file) from which I have
to scrub specific list of words (delete words).
Here is what I am doing but with no result:
infile = messy_data_file.txt
[Python 2.7]
I have a body of text (~1MB) that I need to modify. I need to look
for matches of a regular expression and replace a random selection of
those matches with a new string. There may be several matches on any
line, and a random selection of them should be replaced. The
probability of
On Sep 8, 3:51 pm, gry georgeryo...@gmail.com wrote:
To elaborate(always give example of desired output...) I would hope to
get something like:
SELECT public.max(PUBLIC.TT.I) AS SEL_0 FROM (SCHM.T RIGHT OUTER JOIN
PUBLIC.TT ON (SCHM.T.I IS NULL)) WHERE (NOT(NOT((power(PUBLIC.TT.F,
PUBLIC.TT.F
[python 2.7] I have a (linux) pathname that I'd like to split
completely into a list of components, e.g.:
'/home/gyoung/hacks/pathhack/foo.py' -- ['home', 'gyoung',
'hacks', 'pathhack', 'foo.py']
os.path.split gives me a tuple of dirname,basename, but there's no
os.path.split_all function.
New submission from Gry gryll...@gmail.com:
Asynchat push() function has a bug which prevents it from functioning.
This code worked fine with Python 2.
---
# https://github.com/jstoker/BasicBot
import asynchat,asyncore,socket
class
On Jan 4, 1:11 am, John Nagle na...@animats.com wrote:
On 1/1/2011 11:26 PM, azakai wrote:
Hello, I hope this will be interesting to people here: CPython running
on the web,
http://syntensity.com/static/python.html
That isn't a new implementation of Python, but rather CPython 2.7.1,
[python-2.4.3, rh CentOS release 5.5 linux, 24 xeon cpu's, 24GB ram]
I have a little data generator that I'd like to go faster... any
suggestions?
maxint is usually 9223372036854775808(max 64bit int), but could
occasionally be 99.
width is usually 500 or 1600, rows ~ 5000.
from random import
[ python3.1.1, re.__version__='2.2.1' ]
I'm trying to use re to split a string into (any number of) pieces of
these kinds:
1) contiguous runs of letters
2) contiguous runs of digits
3) single other characters
e.g. 555tHe-rain.in#=1234 should give: [555, 'tHe', '-', 'rain',
'.', 'in', '#',
On Apr 8, 3:40 pm, MRAB pyt...@mrabarnett.plus.com wrote:
...
Group 1 and group 4 match '='.
Group 1 and group 3 match '1234'.
If a group matches then any earlier match of that group is discarded,
Wow, that makes this much clearer! I wonder if this behaviour
shouldn't be mentioned in some
s='555tHe-rain.in#=1234'
import re
r=re.compile(r'([a-zA-Z]+|\d+|.)')
r.findall(s)
['555', 'tHe', '-', 'rain', '.', 'in', '#', '=', '1234']
This is nice and simple and has the invertible property that Patrick
mentioned above. Thanks much!
--
I want a function (or callable something) that returns a random
word meeting a criterion. I can do it like:
def random_richer_word(word):
'''find a word having a superset of the letters of word'''
if len(set(word) == 26): raise WordTooRichException, word
while True:
w =
Russ wrote:
I have a python module (file) that has a set of parameters associated
with it. Let's say the module is called code.py. I would like to keep
the parameter assignments in a separate file so that I can save a copy
for each run without having to save the entire code.py file. Let's
say
Kay Schluehr wrote:
I have a list of strings ls = [s_1,s_2,...,s_n] and want to create a
regular expression sx from it, such that sx.match(s) yields a SRE_Match
object when s starts with an s_i for one i in [0,...,n]. There might
be relations between those strings: s_k.startswith(s_1) - True
Alex Pavluck wrote:
Hello. On page 124 of Thinking like a Computer Scientist. There is
an exercise to take the following code and with the use of TRY: /
EXCEPT: handle the error. Can somone help me out? Here is the code:
def inputNumber(n):
if n == 17:
raise 'BadNumberError:
Alex Pavluck wrote:
Hello. On page 124 of Thinking like a Computer Scientist. There is
an exercise to take the following code and with the use of TRY: /
EXCEPT: handle the error. Can somone help me out? Here is the code:
def inputNumber(n):
if n == 17:
raise 'BadNumberError:
I agree. The --version option has become quite a de-facto standard
in the linux world. In my sys-admin role, I can blithely run
initiate_global_thermonuclear_war --version
to find what version we have, even if I don't know what it does...
python --version
would be a very helpful addition.
index is about the best you can do with the structure you're using.
If you made the items instances of a class, then you could define a
__cmp__ member, which would let you do:
a=Item('A')
b=Item('B')
if ab: something
The Item class could use any of various means to maintain order
information. If
A perspective that I haven't seen raised here is inheritance.
I often say
mylist = []
if I'm done with the current contents and just want a fresh list.
But the cases where I have really needed list.clear [and laboriously
looked for it and ended up with
del l[:]
were when the object was my
Read about string split and join. E.g.:
l = '0.87 0.25 0.79'
floatlist = [float(s) for s in l.split()]
In the other direction:
floatlist = [0.87, 0.25, 0.79004]
outstring = ' '.join(floatlist)
If you need to control the precision(i.e. suppress the 4), read
about
the
For multiple keys the form is quite analogous:
L.sort(key=lambda i: (i.whatever, i.someother, i.anotherkey))
I.e., just return a tuple with the keys in order from your lambda.
Such tuples sort nicely.
-- George Young
--
http://mail.python.org/mailman/listinfo/python-list
http://www.python.org/doc/topics/database/
--
http://mail.python.org/mailman/listinfo/python-list
In fact, not just characters, but strings contain themselves:
'abc' in 'abc'
True
This is a very nice(i.e. clear and concise) shortcut for:
'the rain in spain stays mainly'.find('rain') != -1
True
Which I always found contorted and awkward.
Could you be a bit more concrete about your
This would indeed be a nice feature.
The glob module is only 75 lines of pure python. Perhaps you would
like
to enhance it? Take a look.
--
http://mail.python.org/mailman/listinfo/python-list
Martin P. Hellwig wrote:
Hi all,
I was doing some popen2 tests so that I'm more comfortable using it.
I wrote a little python script to help me test that (testia.py):
-
someline = raw_input(something:)
if someline == 'test':
print(yup)
else:
First, don't appologize for asking questions. You read, you thought,
and you tested. That's more than many people on this list do. Bravo!
One suggestion: when asking questions here it's a good idea to always
briefly mention which version of python and what platform (linux,
windows, etc) you're
[python 2.3.3, pyparsing 1.3]
I have:
def unpack_sql_array(s):
# unpack a postgres array, e.g. {'w1','w2','w3'} into a
list(str)
import pyparsing as pp
withquotes = pp.dblQuotedString.setParseAction(pp.removeQuotes)
withoutquotes = pp.CharsNotIn(',{}')
parser =
Just curious about people's sense of style:
To delete all the elements of a list, should one do:
lst[:] = []
or
del(lst[:])
I seem to see the first form much more often in code, but
the second one seems more clearly *deleting* elements,
and less dangerously mistaken for the completely
Christoph Zwerschke wrote:
Usually, you initialize class variables like that:
class A:
sum = 45
But what is the proper way to initialize class variables if they are the
result of some computation or processing as in the following silly
example (representative for more:
class A:
Just a few suggestions:
1) use consistant formatting, preferably something like:
http://www.python.org/peps/pep-0008.html
E.g.:
yesno = {0:No, 1:Yes, True:Yes, False:No}
2) if (isinstance(self.random_seed,str)):
s=s+Random Seed: %s\n % self.random_seed
else:
NateM wrote:
How do I convert any given date into a milliseconds value that
represents the number of milliseconds that have passed since January 1,
1970 00:00:00.000 GMT?
Is there an easy way to do this like Date in java?
Thanks,
Nate
The main module for dates and times is datetime; so
[EMAIL PROTECTED] wrote:
Hello there,
i need a way to check to see if a certain value can be an integer. I
have looked at is int(), but what is comming out is a string that may
be an integer. i mean, it will be formatted as a string, but i need to
know if it is possible to be expressed as an
John Reese wrote:
Hi.
import time, calendar, datetime
n= 1133893540.874922
datetime.datetime.fromtimestamp(n)
datetime.datetime(2005, 12, 6, 10, 25, 40, 874922)
lt= _
datetime.datetime.utcfromtimestamp(n)
datetime.datetime(2005, 12, 6, 18, 25, 40, 874922)
gmt= _
So it's easy to
There was just recently announced -- iplib-0.9:
http://groups.google.com/group/comp.lang.python.announce/browse_frm/thread/e289a42714213fb1/ec53921d1545bf69#ec53921d1545bf69
It appears to be pure python and has facilities for dealing with
netmasks. (v4 only).
-- George
--
[EMAIL PROTECTED] wrote:
Hello,
I am considering using dictionnaries as lookup tables e.g.
D={0.5:3.9,1.5:4.2,6.5:3}
and I would like to have a dictionnary method returning the key and
item of the dictionnary whose key is smaller than the input of the
method (or =,,=) but maximal (resp.
Yes, eval of data from a file is rather risky. Suppose someone gave
you
a file containing somewhere in the middle:
...
22,44,66,88,asd,asd,23,43,55
os.system('rm -rf *')
33,47,66,88,bsd,bsd,23,99,88
...
This would delete all the files in your directory!
The csv module mentioned above is the
import sys
for l in sys.stdin:
sys.stdout.write(l)
-- George
--
http://mail.python.org/mailman/listinfo/python-list
Python 2.3.3, Tkinter.__version__'$Revision: 1.177 $'
Hmm, the error window pops up with appropriate title, but contains no
text.
I stuck an unbuffered write to a log file in ErrorPipe.write and got
only one line: Traceback (most recent call last):$
Any idea what's wrong?
-- George
--
sysfault wrote:
Hello, I have a function which takes a program name, and I'm using
os.popen() to open that program via the syntax: os.popen('pidof var_name',
'r'), but as you know var_name is not expanded within single quotes, I
tried using double quotes, and such, but no luck. I was looking
What I have done in similar circumstances is put in a random sleep
between connections to fool the server's load manager. Something like:
.import time
.min_pause,max_pause = (5.0, 10.0) #seconds
.while True:
. time.sleep(random.uniform(min_pause, max_pause))
. do_connection_and_query_stuff()
Aditi wrote:
hi all...i m a software engg. student completed my 2nd yr...i have been
asked to make a project during these summer vacations...and hereby i
would like to invite some ideas bout the design and implementation of
an APPLICATION MONITORING SYSTEMi have to start from scrach so
PyParsing rocks! Here's what I ended up with:
def unpack_sql_array(s):
import pyparsing as pp
withquotes = pp.dblQuotedString.setParseAction(pp.removeQuotes)
withoutquotes = pp.CharsNotIn(',')
parser = pp.StringStart() + \
pp.Word('{').suppress() + \
I have a string like:
{'the','dog\'s','bite'}
or maybe:
{'the'}
or sometimes:
{}
[FYI: this is postgresql database array field output format]
which I'm trying to parse with the re module.
A single quoted string would, I think, be:
r\{'([^']|\\')*'\}
but how do I represent a *sequence* of
Hugh Macdonald wrote:
We're starting to version a number of our python modules here, and
I've
written a small function that assists with loading the versioned
modules...
A module would be called something like: myModule_1_0.py
In anything that uses it, though, we want to be able to refer
I often find myself wanting an instance attribute that can take on only
a few fixed symbolic values. (This is less functionality than an enum,
since there are no *numbers* associated with the values). I do want
the thing to fiercely object to assignments or comparisons with
inappropriate values.
Hmm, I had no idea that property was a class. It's listed in the
library
reference manual under builtin-functions. That will certainly make
things neater. Thanks!
-- George
--
http://mail.python.org/mailman/listinfo/python-list
I sometimes use the implicit literal string concatenation:
def SomeFunction():
if SomeCondition:
MyString = 'The quick brown fox ' \
'jumped over the ' \
'lazy dog'
print MyString
SomeFunction()
The quick brown fox jumped over the lazy dog
It
[EMAIL PROTECTED] wrote:
I am new to python and I am not in computer science. In fact I am a
biologist and I ma trying to learn python. So if someone can help me, I
will appreciate it.
Thanks
#!/cbi/prg/python/current/bin/python
# -*- coding: iso-8859-1 -*-
import sys
import os
from
SPJ wrote:
I am new to python hence posing this question.
I have a file with the following format:
test11.1-1 installed
test11.1-1 update
test22.1-1 installed
test22.1-2 update
I want the file to be formatted in the following way:
test11.1-1 1.1-2
test2
As far as I can tell, what you ultimately want is to be able to extract
a random (representative?) subset of sentences. Given the huge size
of data, I would suggest not randomizing the file, but randomizing
accesses to the file. E.g. (sorry for off-the-cuff pseudo python):
[adjust 8196 == 2**13
[your %b is supposed to be the abbreviated month name, not the
number. Try %m]
In [19]: datetime.datetime(*time.strptime(20-3-2005,%d-%m-%Y)[:6])
Out[19]: datetime.datetime(2005, 3, 20, 0, 0)
Cheers,
George
--
http://mail.python.org/mailman/listinfo/python-list
Premshree Pillai wrote:
PyAC 0.1.0 (http://sourceforge.net/projects/pyac/)
* ignores non-image files
* optional arg is_ppt for ordering presentation images (eg.,
Powerpoint files exported as images)
* misc fixes
Package here:
To inherit from an immutable class, like string or tuple, you need to
use the __new__ member, not __init__. See, e.g.:
http://www.python.org/2.2.3/descrintro.html#__new__
--
http://mail.python.org/mailman/listinfo/python-list
import pg
db = pg.DB('bind9', '192.168.192.2', 5432, None, None, 'named', None)
db.query('create temp table fffz(i int,t text)')
db.query('copy fffz from stdin')
db.putline(3\t'the')
db.putline(4\t'rain')
db.endcopy()
db.query('commit')
Note that multiple columns must be separated by tabs ('\t')
The _winreg api looks helpful; unfortunately, I'm trying to stick to
what can be got
from the cygwin install -- no _winreg. Simplicity of installation is
quite important.
(I'm using cygwin to get the xfree86 X-server, which is the whole point
of this exercise)
I have found the cygwin
[Windows XP Pro, cygwin python 2.4, *nix hacker, windows newbie]
I want to write some kind of install script for my python app that
will add c:\cygwin\usr\bin to the system path. I don't want
to walk around to 50 PC's and twiddle through the GUI to:
My Computer -- Control Panel -- System --
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