Andrew,
You are correct, that article was very beneficial. It helped me
understand the stack, much better.
Thanks,
kmcb
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Hello,
I'm interested in creating a static map of a region in the US. This
map would be set into a picture format, so I can add it to a
document. I would like it to contain some town names and road
information. Then I would like to add points, based on LAT and LONG,
that can be labeled
KMCB wrote:
Hello,
I'm interested in creating a static map of a region in the US. This
map would be set into a picture format, so I can add it to a
document. I would like it to contain some town names and road
information. Then I would like to add points, based on LAT and LONG,
that can
':
print testing multiprocessing on ,mul.cpu_count(),cores
--
print
elements = 10
pool = mul.Pool(processes=mul.cpu_count())
t1 = time()
res_par = pool.map(f, range(elements))
t2 = time()
res_seq = map(f, range(elements))
t3 = time
Changes by Jesse Noller jnol...@gmail.com:
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___
___
Amaury Forgeot d'Arc amaur...@gmail.com added the comment:
The multiprocessing module indeed has some overhead:
- the processes are spawned when needed. Before you perform performance
timings, you should warm up the Pool with a line like
pool.map(f, range(mul.cpu_count()))
(starting a
Jesse Noller jnol...@gmail.com added the comment:
My results don't match yours. (8 cores, Mac OS/X):
testing multiprocessing on 8 cores --
10 elements map() time 0.0444118976593 s
10 elements pool.map() time 0.0366489887238 s
10 elements pool.apply_async() time
Jesse Noller jnol...@gmail.com added the comment:
Closing as not an issue.
--
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___
___
, first processes should be spawned, not waiting map function)
or something like that. But it is only cosmetics :-)
___
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Terry J. Reedy [EMAIL PROTECTED] added the comment:
Dict views and range objects are *iterables* because they are based on
reusable information. Map, filter, and similar objects are *iterators*
because they are based on iterables that could be once-through
iterators. The built-in function
New submission from Jean-Michel Fauth [EMAIL PROTECTED]:
win XP sp2, Py3.0c2
I had to face an annoying problem when iterating over a map object.
With a range class, this works
r = range(5)
list(r)
[0, 1, 2, 3, 4]
With dict_keys/values/items objects, the following works
d = {1: 'a', 2:'b
Raymond Hettinger [EMAIL PROTECTED] added the comment:
Feature :-)
You will get the expected result if you skip the step where you ran the
for-loop over r before running list(). Either listing or for-looping
will exhaust the iterator. This is how iterators work.
--
nosy: +rhettinger
personal reasonsquot;
(bad habits?), I frequently fall in this trap.brbrgt;gt;gt; def
plus(i):br
nbsp;nbsp;nbsp; return i + 1brbrgt;gt;gt; list(map(plus,
range(4)))br[1, 2, 3, 4]brgt;gt;gt; brbrRegardsbrbr
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Terry Reedy wrote:
If the terminal expects cp437 then displaying utf-8 might give some
problems.
My screen displays whatever Windows tells the graphics card to tell
the screen to display. In OpenOffice, I can select a unicode font
that displays at least everything in the
Tim Roberts wrote:
josh logan [EMAIL PROTECTED] wrote:
I am using Python 3.0b2.
I have an XML file that has the unicode character '\u012b' in it,
which, when parsed, causes a UnicodeEncodeError:
'charmap' codec can't encode character '\u012b' in position 26:
character maps to undefined
This
On Mon, 01 Sep 2008 02:27:54 -0400, Terry Reedy wrote:
I doubt the OP 'chose' cp437. Why does Python using cp437 even when the
default encoding is utf-8?
On WinXP
sys.getdefaultencoding()
'utf-8'
s='\u012b'
s
Traceback (most recent call last):
File stdin, line 1, in module
On Sep 1, 8:19 am, Marc 'BlackJack' Rintsch [EMAIL PROTECTED] wrote:
On Mon, 01 Sep 2008 02:27:54 -0400, Terry Reedy wrote:
I doubt the OP 'chose' cp437. Why does Python using cp437 even when the
default encoding is utf-8?
On WinXP
sys.getdefaultencoding()
'utf-8'
s='\u012b'
Marc 'BlackJack' Rintsch wrote:
On Mon, 01 Sep 2008 02:27:54 -0400, Terry Reedy wrote:
I doubt the OP 'chose' cp437. Why does Python using cp437 even when the
default encoding is utf-8?
On WinXP
sys.getdefaultencoding()
'utf-8'
s='\u012b'
s
Traceback (most recent call last):
File
On Mon, 01 Sep 2008 14:25:01 -0400, Terry Reedy wrote:
Marc 'BlackJack' Rintsch wrote:
On Mon, 01 Sep 2008 02:27:54 -0400, Terry Reedy wrote:
Most likely because Python figured out that the terminal expects cp437.
What does `sys.stdout.encoding` say?
The interpreter in the command prompt
Marc 'BlackJack' Rintsch wrote:
First, thank you for the informative responses.
The windows command prompt expects cp437 because that's what old DOS
programs print to it.
Grrr. When the interpreter runs, it opens the command prompt window
with Python running, and the window closes when
Hello,
I am using Python 3.0b2.
I have an XML file that has the unicode character '\u012b' in it,
which, when parsed, causes a UnicodeEncodeError:
'charmap' codec can't encode character '\u012b' in position 26:
character maps to undefined
This happens even when I assign this character to a
josh logan [EMAIL PROTECTED] wrote:
I am using Python 3.0b2.
I have an XML file that has the unicode character '\u012b' in it,
which, when parsed, causes a UnicodeEncodeError:
'charmap' codec can't encode character '\u012b' in position 26:
character maps to undefined
This happens even when I
engelbert gruber [EMAIL PROTECTED] added the comment:
and now it is 2.6 ?
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Georg Brandl [EMAIL PROTECTED] added the comment:
May even be too late for 2.6. :)
___
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___
___
engelbert gruber [EMAIL PROTECTED] added the comment:
i just wanted to get rid of one python2.6 -3 warning in string and
found that a patch was already waiting. from this thing i conclude
smaller patches might get committed earlier , do they ?
On Fri, Jul 18, 2008 at 8:42 PM, Georg Brandl
Georg Brandl [EMAIL PROTECTED] added the comment:
That is true. Barry might not want to allow a large catch-all patch; but
since those changes are not adding new features, simple small ones can
certainly get in before beta3.
___
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engelbert gruber [EMAIL PROTECTED] added the comment:
so i add a one liner replacing map(None with list ?
On 7/18/08, Georg Brandl [EMAIL PROTECTED] wrote:
Georg Brandl [EMAIL PROTECTED] added the comment:
That is true. Barry might not want to allow a large catch-all patch; but
since
Georg Brandl [EMAIL PROTECTED] added the comment:
I can replace those too.
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engelbert gruber [EMAIL PROTECTED] added the comment:
it is only one in string.py, but then again it is save to do.
thanks
On 7/18/08, Georg Brandl [EMAIL PROTECTED] wrote:
Georg Brandl [EMAIL PROTECTED] added the comment:
I can replace those too.
Georg Brandl [EMAIL PROTECTED] added the comment:
OK, I nixed the simple uses of map(None, a).
___
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PROTECTED] wrote:
Georg Brandl [EMAIL PROTECTED] added the comment:
OK, I nixed the simple uses of map(None, a).
___
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Georg Brandl [EMAIL PROTECTED] added the comment:
Problem is, we already have a section Builtin types.
Fixed the map() docs in r62738, and added a note to the first sentence
in r62739.
__
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and classes in the sentence to
introduce the generic term. This would at least slightly help the
sometimes confusion between 'function' as specific class and as generic
callable.
This change also applies to 2.6 (and earlier, but oh, well...).
3.0 entry for map() (now a class!) in this section. Please add
Benjamin Peterson [EMAIL PROTECTED] added the comment:
Guido is doing 3.0 whatsnew.
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__
Raymond Hettinger [EMAIL PROTECTED] added the comment:
FWIW, I think the title is clearer as-is. While it is technically true
that some entries are callables of various types, it is simpler to
think of all of them as functions. The proposed change makes the docs
harder to understand and
Georg Brandl [EMAIL PROTECTED] added the comment:
I agree with Raymond here.
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__
2 of 'built-in functions
and [built-in] classes' is better.
The map doc issues are, of course, separate from the title and lead
sentence issue.
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grbgooglefan schrieb:
Hi,
I have a situation that I need to search a name in a big list of names
in my Python embedded interpreter. I am planning to use hash map for
quicker search.
How do I create hash map in Python?
Can you please guide me to some documentation or tutorial which
provides
Hi,
I have a situation that I need to search a name in a big list of names
in my Python embedded interpreter. I am planning to use hash map for
quicker search.
How do I create hash map in Python?
Can you please guide me to some documentation or tutorial which
provides information on creating
On 19 Mar, 09:40, grbgooglefan [EMAIL PROTECTED] wrote:
How do I create hash map in Python?
Python dictionaries are the fastest hash maps known to man.
If you need persistent storage of your hash map, consider module bsddb
or dbhash.
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sturlamolden [EMAIL PROTECTED] wrote in message
news:[EMAIL PROTECTED]
| On 19 Mar, 09:40, grbgooglefan [EMAIL PROTECTED] wrote:
|
| How do I create hash map in Python?
|
| Python dictionaries are the fastest hash maps known to man.
If you only have keys (the names) and no values attached
On Mar 19, 2:40 am, grbgooglefan [EMAIL PROTECTED] wrote:
Hi,
I have a situation that I need to search a name in a big list of names
in my Python embedded interpreter. I am planning to use hash map for
quicker search.
How do I create hash map in Python?
Can you please guide me to some
David Wolever [EMAIL PROTECTED] added the comment:
Filter has been fixed in r61546.
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David Wolever [EMAIL PROTECTED] added the comment:
Ok, checked in the last piece -- fixer for filter -- in r61598.
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New submission from Brett Cannon [EMAIL PROTECTED]:
A fixer for converting itertools.imap() to - map() is needed.
--
assignee: collinwinter
components: 2to3 (2.x to 3.0 conversion tool)
keywords: 26backport
messages: 63736
nosy: brett.cannon, collinwinter
priority: immediate
severity
Changes by Brett Cannon [EMAIL PROTECTED]:
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David Wolever [EMAIL PROTECTED] added the comment:
I'll take this one (and the next few dealing with itertools)
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Georg Brandl [EMAIL PROTECTED] added the comment:
See also #2171.
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David Wolever [EMAIL PROTECTED] added the comment:
To clarify, 2to3 shouldn't wrap map, filter, zip in list() if they are
imported from future_builtins.
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David Wolever [EMAIL PROTECTED] added the comment:
The 2to3 stuff relating to map is added in r61479.
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David Wolever [EMAIL PROTECTED] added the comment:
Fixed in r61466.
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status: open - closed
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Raymond Hettinger [EMAIL PROTECTED] added the comment:
Do you guys see any merit in changing the argument order for ifilter so
that the predicate function can just be an optional argument:
ifilter(data[, pred])
Alex Martelli successfully lobbied for groupby() to have that same
argument
Guido van Rossum [EMAIL PROTECTED] added the comment:
It would break the symmetry with map().
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Raymond Hettinger [EMAIL PROTECTED] added the comment:
Okay, thanks. Though, I should have also mentioned symmetries with
sorted(), min(), and max() which all take the iterable first and follow
with an optional key function.
Closing this one. The map(None, *args) feature was removed for 3.0
Alexander Belopolsky [EMAIL PROTECTED] added the comment:
It may be too late to express my opinion, but why symmetry with map is
so important? There are several reasons why sequence, predicate order
is natural for filter and function, sequence is a natural order for map.
1. In list
Raymond Hettinger [EMAIL PROTECTED] added the comment:
Moved filter to builtins in r61536.
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Raymond Hettinger [EMAIL PROTECTED] added the comment:
Moved map to builtins in r61357.
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Alexander Belopolsky added the comment:
Attached patch removes support for None from filter and
itertools.ifilter. My objections for removing that from map do not
apply because bool function can be used instead of None in filter
achieving similar performance and better clarity.
None support
Alexander Belopolsky added the comment:
Can you assign this to Raymond as well? If this is done first, issue2186
patch will be simpler (at least in the documentation portion). The same
question on the fate of ifilterfalse is pertinent here as well.
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Changes by Guido van Rossum:
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function is bool().
+1 On removing the None argument from map() and imap(). It was
hold-over from the days before zip().
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Alexander Belopolsky added the comment:
Raymond,
There must be a reason why we constantly disagree. Do you live in
California by any chance? :-)
I am not sure if map(None, ..) fate is still up for voting given your
changes at r60206, but your own patch illustrates the problem that I
Raymond Hettinger added the comment:
FWIW, I didn't disagree on filter(). Am taking your suggestion under
advisement for a couple days. At this point, I'm leaning towards
accepting the request (although with a different version of the patch).
For map(None, ...), I happy to live with examples
Alexander Belopolsky added the comment:
Raymond,
it looks like you just broke the build for me:
/Users/sasha/Work/python-svn/trunk/Modules/itertoolsmodule.c: In
function 'ifilter_next':
/Users/sasha/Work/python-svn/trunk/Modules/itertoolsmodule.c:2058:
error: invalid operands to binary ==
Raymond Hettinger added the comment:
Alexander, please contact me directly at python at rcn dot com.
Need to figure-out why this works on my build but not yours. There may
be an include file issue.
__
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Raymond Hettinger added the comment:
What do you guys think about just making the predicate argument optional?
filter([-2,0,2]) -- -2, 2
filter(pred, iterable)
One arg is the first case and two args is the second case.
__
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Alexander Belopolsky added the comment:
What do you guys think about just making the predicate argument
optional?
You've read my mind! That what I was going to suggest if I realized that
optional argument does not have to be the last one.
Looks like it would make sense to keep filterfalse
if some decision was made?
Note that in msg55022 I said: If [the identity] proposal is accepted,
it will make sense to deprecate the use of None as an identity function
in map. So there may be no disagreement at all.
__
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http
Guido van Rossum added the comment:
What do you guys think about just making the predicate argument optional?
filter([-2,0,2]) -- -2, 2
filter(pred, iterable)
One arg is the first case and two args is the second case.
-1. Apart from range() this is used nowhere else in Python.
Raymond Hettinger added the comment:
Okay. Will drop None in favor of bool() in ifilter and ifilterfalse.
Also, it looks like there agreement on dropping None for map() and
going forward with the operator.identity() patch. Will check these in
in the next couple of days
New submission from Guido van Rossum:
There are other ways of getting the same effects now (list() or zip()
for map(None, ...)).
--
keywords: easy
messages: 62967
nosy: gvanrossum
severity: normal
status: open
title: map and filter shouldn't support None as first argument (in Py3k only
Changes by Guido van Rossum:
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type: - behavior
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New submission from Guido van Rossum:
Probably ifilter and imap should go (moving the code over to bltinmodule.c).
--
components: Interpreter Core
keywords: easy
messages: 62968
nosy: gvanrossum
severity: normal
status: open
title: map and filter objects shouldn't call themselves
Alexander Belopolsky added the comment:
In the absence of an identity function, map accepting None is useful in
the cases like this:
converters = {..}
y = map(converters.get(c), x)
That will now have to be rewritten as
conv = converters.get(c)
if conv is None:
y = list(x)
else:
y = map
Changes by Georg Brandl:
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Luke:
What design patterns would you use here?
What about generator (scanner) with parameters? :-)
Bye,
bearophile
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On Jan 15, 1:53 am, [EMAIL PROTECTED] wrote:
Luke:
What design patterns would you use here?
What about generator (scanner) with parameters? :-)
Bye,
bearophile
I'm not familiar with this pattern. I will search around, but if you
have any links or you would like to elaborate, that would be
Luke:
I'm not familiar with this pattern. I will search around, but if you
have any links or you would like to elaborate, that would be
wonderful. :)
It's not a pattern, it's a little thing:
def line_filter(filein, params):
for line in filein:
if good(line, params):
yield
On Jan 14, 7:56 pm, Luke [EMAIL PROTECTED] wrote:
I am writing an order management console. I need to create an import
system that is easy to extend. For now, I want to accept an dictionary
of values and map them to my data model. The thing is, I need to do
things to certain columns:
- I
On Jan 15, 6:53 pm, George Sakkis [EMAIL PROTECTED] wrote:
name_tranformer = lambda input: dict(
zip(('first_name', 'last_name'),
input['name']))
Of course that should write:
name_tranformer = lambda input: dict(
On Jan 15, 3:53 pm, George Sakkis [EMAIL PROTECTED] wrote:
On Jan 14, 7:56 pm, Luke [EMAIL PROTECTED] wrote:
I am writing an order management console. I need to create an import
system that is easy to extend. For now, I want to accept an dictionary
of values and map them to my data model
I am writing an order management console. I need to create an import
system that is easy to extend. For now, I want to accept an dictionary
of values and map them to my data model. The thing is, I need to do
things to certain columns:
- I need to filter some of the values (data comes in as
Python programmers may find the application to decoding an encrypted map
image format known as Memory Map to produce a standard PNG image file
interesting.
Someone obviously very well versed in Python and in the intricacies of image
files has written a routine to decode originally the UK
Python programmers may find the application to decoding an encrypted
map
image format known as Memory Map to produce a standard PNG image file
interesting.
Someone obviously very well versed in Python and in the intricacies
of image
files has written a routine to decode originally the UK
Python programmers may find the application to decoding an encrypted
map
image format known as Memory Map to produce a standard PNG image file
interesting.
Someone obviously very well versed in Python and in the intricacies
of image
files has written a routine to decode originally the UK
is an example of what I would like to do:
|
| Python 2.5.1 (r251:54863, May 18 2007, 16:56:43)
| [GCC 3.4.4 (cygming special, gdc 0.12, using dmd 0.125)] on cygwin
| Type help, copyright, credits or license for more information.
| a = [[1,2,3],[4,5,6,7],[8,9]]
| print map(lambda *row: list
, using dmd 0.125)] on cygwin
Type help, copyright, credits or license for more information.
a = [[1,2,3],[4,5,6,7],[8,9]]
print map(lambda *row: list(row), *a)
[[1, 4, 8], [2, 5, 9], [3, 6, None], [None, 7, None]]
However, in the Python 3000 FAQ (http://www.artima.com/weblogs/
viewpost.jsp?thread
(r251:54863, May 18 2007, 16:56:43)
| [GCC 3.4.4 (cygming special, gdc 0.12, using dmd 0.125)] on cygwin
| Type help, copyright, credits or license for more information.
| a = [[1,2,3],[4,5,6,7],[8,9]]
| print map(lambda *row: list(row), *a)
| [[1, 4, 8], [2, 5, 9], [3, 6, None], [None, 7, None
is there a way to open it? and edit?
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I thought I had the difference between 'zip' and 'map' sorted but when
I try to fill missing entries with something other than 'None'. I do
not seem to be able to get it to work - any pointers appreciated.
Richard
lista = ['a1', 'a2']
listb = ['b10', 'b11','b12' ,'b13']
for x,y in zip(lista
On May 26, 4:54 am, mosscliffe [EMAIL PROTECTED] wrote:
I thought I had the difference between 'zip' and 'map' sorted but when
I try to fill missing entries with something other than 'None'. I do
not seem to be able to get it to work - any pointers appreciated.
Richard
lista = ['a1', 'a2
In [EMAIL PROTECTED], mosscliffe
wrote:
for x,y in map(None, lista, listb): # Also fine - extends as
expected
print MAP:, x, x y, y
for x,y in map(N/A, lista, listb): ## Fails - Can not call a
'str'
print MAP:, x, x y, y
def fillwith(fillchars):
return
mosscliffe schreef:
for x,y in map(N/A, lista, listb): ## Fails - Can not call a
'str'
print MAP:, x, x y, y
def fillwith(fillchars):
return fillchars
for x,y in map(fillwith(N/A), lista, listb): ## Fails also -
Can not call a 'str'
print MAP:, x, x y, y
]
wrote:
mosscliffe schreef:
for x,y in map(N/A, lista, listb): ## Fails - Can not call a
'str'
print MAP:, x, x y, y
def fillwith(fillchars):
return fillchars
for x,y in map(fillwith(N/A), lista, listb): ## Fails also -
Can not call a 'str'
print MAP
On May 26, 7:47 am, Roel Schroeven [EMAIL PROTECTED]
wrote:
mosscliffe schreef:
for x,y in map(N/A, lista, listb): ## Fails - Can not call a
'str'
print MAP:, x, x y, y
def fillwith(fillchars):
return fillchars
for x,y in map(fillwith(N/A), lista, listb
return
value:
result = calc() + 2
becomes:
result = 3.5 + 2
3) map() and zip() perform two different tasks. zip() takes two(or
more) sequences, and it returns a list of tuples, where each tuple
consists of one element from each of the sequences:
s1 = [1, 2, 3]
s2 = [10, 20, 30, 40]
print zip(s1
Hi all,
Is there any module to make a network diagram given a 2-D matrix of
distances ?
any hints
regards,
KM
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