Re: Looking for Remote Python Project

[Ben Finney]

joy99 subhakolkata1...@gmail.com writes:

 But do you know whether it would be a paying one, I am looking to be a
 freelancer.

You might find the Python Job Board useful
URL:http://www.python.org/community/jobs/.

-- 
 \“Choose mnemonic identifiers. If you can't remember what |
  `\mnemonic means, you've got a problem.” —Larry Wall |
_o__)  |
Ben Finney
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Re: Use the Source Luke

[Steven D'Aprano]

On Sat, 29 Jan 2011 20:50:20 -0800, rusi wrote:

 On Jan 30, 9:21 am, Steven D'Aprano steve
 +comp.lang.pyt...@pearwood.info wrote:

  I think this is a fairly accurate description of (one aspect of) the
  problem.
  If you dont see it as a problem how do you explain that google can
  search the World Wide Web better than we can search our individual
  hard disks?

 I fail to see any connection between the location that operating
 systems store files, and the ability of Google to index publicly
 available websites.
 
 http://en.wikipedia.org/wiki/Content-addressable_storage#Content-
addressed_vs._Location-addressed


Nope, sorry, doesn't help. Both local files on your hard drive, and most 
remote websites on the Internet, are location addressed. Google indexes 
the content, but they don't provide content-addresses. Indeed, they 
*can't* do so (except, possibly, for content they control such as Google 
Books), since they can't prevent content owners from modifying either the 
location address or the content. And as I've mentioned, there are desktop 
utilities that index content for Windows and Macintosh. In fact, Google 
themselves offer a desktop app that does just that:

http://desktop.google.com/features.html



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Re: multiple values for keyword argument

[Steven D'Aprano]

On Sat, 29 Jan 2011 10:39:49 -0800, patty wrote:

 I am glad you said this.  I have been avoiding understanding this
 'self', just accepting it :}  For the time being, since my programs I am
 creating are for my own use, I think I will make my own names up, that
 are descriptive to me as the programmer, it's all going to be
 interpreted anyway.  And the other email equating to C's argv, etc. -
 now I get it.


That's a shame, because `self` is actually very simple once you 
understand the basic principles of object-oriented programming.

What names would you choose? Unless you're writing descriptors, or using 
class methods, both of which should be considered advanced usage (highly 
advanced for descriptors, moderately so for class methods), it's not like 
every method needs a different descriptive first argument. In English, 
self, this, me or instance would be good names. What else would 
you use?


The idea of method syntax is that you start with an instance of some 
class:

mystring = hello world  # an instance of the str class

In procedural languages like C or Pascal, you would call a function and 
give the string as an argument. Python supports this programming model, 
and uses it for built-ins like len:

len(mystring)
= returns 11


Object oriented programming uses a different syntax. Instead of 

function(instance)

as above, we take the instance argument outside the brackets. For example:

mystring.upper()  # instead of upper(mystring)
= returns HELLO WORLD

If there are any extra arguments needed, they go inside the brackets as 
normal.

So far, this is just a change of syntax. It's like saying The cat of my 
brother's vs. my brother's cat -- the meaning is the same, but the 
syntax differs. The real advantages of object oriented programming and 
methods come elsewhere (e.g. encapsulation and inheritance).

[Aside: when I was learning this, the hardest part I found was
remembering which things were functions, and which were methods. 
I kept writing (wrongly!) things like:

hello world.len()
upper(hello world)

Unfortunately there is no easy way to recognise what will be a
function like len, and which are methods like upper. That will 
come with experience.

Back to function/procedural syntax versus object oriented syntax... 

One difference, though, is when you write a method definition. Because 
the method you write starts off life as an ordinary function, you need to 
write it *as if* it were a function you call like len() above. Here's how 
you might write a method in a class:

class MyClass:
def method(self, extra):
pass

When you then call the method:

instance = MyClass()
instance.method(something extra)

Python automatically changes the syntax for you, and passes two arguments 
to the function as if you did this:

# pseudo-code
set self = instance
set extra = something extra
extract method from MyClass
call method(self, extra)

We call the first argument something like self because it will ALWAYS 
be the instance itself. Unlike a regular function, which can have 
anything passed as the first argument, and therefore you should give it a 
descriptive name, the method's first argument is provided automatically 
for you and will always be the instance you started with.



I hope this helps.




-- 
Steven
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Re: Use the Source Luke

[David Boddie]

On Sunday 30 January 2011 05:21, Steven D'Aprano wrote:

 If I *wanted* to index my files, I could do so, although in
 fairness I'm not aware of any Linux tools which do this -- I know of
 `locate`, which indexes file *names* but not content, and `grep`, which
 searches file content but doesn't index what it finds.

You might find this page useful:

http://www.wikinfo.org/index.php/Comparison_of_desktop_search_software

David
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Re: Is it possible to pass CSV Reader Object As Argument to another Python File ???

[bansi]

On Jan 28, 4:22 pm, Benjamin Kaplan benjamin.kap...@case.edu wrote:
 On Fri, Jan 28, 2011 at 3:42 PM, bansi mail2ba...@gmail.com wrote:
  On Jan 28, 1:52 pm, Benjamin Kaplan benjamin.kap...@case.edu wrote:
  On Fri, Jan 28, 2011 at 1:33 PM, bansi mail2ba...@gmail.com wrote:
   On Jan 28, 9:46 am, bansi mail2ba...@gmail.com wrote:
   On Jan 26, 8:31 pm, MRAB pyt...@mrabarnett.plus.com wrote:

On 27/01/2011 00:57, bansi wrote:

 On Jan 26, 6:25 pm, Ethan Furmanet...@stoneleaf.us  wrote:
 bansi wrote:

     First namelookupWrapper.py running under Python 2.6 accept 
 arguments
     from stdin and uses csv reader object to read it i.e.
     r=csv.reader(sys.stdin)

     And then it has to pass csv reader object to another python 
 script
     namelookup.py running under Python 2.7 because it uses pyodbc 
 to
     connect to database and iterates thru reader object

 Ben Finney wrote:
 bansimail2ba...@gmail.com  writes:

 Thanks Chris. Sorry for mis-communicating, the two python 
 scripts are
 dependant in a way that namelookupWrapper.py needs to pass csv 
 record
 object to another python script

 Why have you structured them that way, though? What constraint is
 keeping you from doing the work in a single process, where the CSV
 reader object can be shared?

 If thats not possible then please let me know how to do the 
 workaround
 i didnt understood the import thing and not sure if it helps in 
 my
 case

 The problem as you've described it so far is best solved by 
 having a
 single process accessing the CSV reader object in memory. If that
 doesn't suit your use case, you'll need to explain why not.

 In other words, why can't you use Python 2.7 to accept input and
 generate a csv.reader?

 ~Ethan~- Hide quoted text -

 - Show quoted text -

 Ethan,
 The python script takes the input from Splunk 
 (http://www.splunk.com/
 base/Documentation/) which supports only Python 2.6
 So the real constraint is Splunk supports only Python 2.6 .

 As you know Python 2.6 doesnt support or doesnt have pyodbc install
 for Windows  64 bit OS
 So i installed Python 2.7 and thereafter pyodbc install for Windows 
 64
 bit OS for Python 2.7

Have you actually tried Splunk with Python 2.7? It might not work with
versions which are earlier than Python 2.6, but that doesn't
necessarily mean that it won't work with versions of Python 2 which 
are
later than Python 2.6 (unless the documentation says that it must be
Python 2.6).- Hide quoted text -

- Show quoted text -

   Splunk's latest version 4.1.6 doesn't support Python 2.7
   I tried the import trick but it didnt work because the real script
   which runs under Python 2.7 has import pyodbc so it results in
   following error

   c:\Splunk\etc\apps\search\binsplunk cmd python namelookupWrapper.py
   memberId memberName  memberInput.csv
   Traceback (most recent call last):
     File namelookupWrapper.py, line 3, in module
       import namelookup
     File c:\Splunk\etc\apps\search\bin\namelookup.py, line 7, in
   module
       import pyodbc
   ImportError: DLL load failed: The specified module could not be found.

   Please let me know if i am missing something on import. If so please
   provide me with an example- Hide quoted text -

   - Show quoted text -

   Here are some more details from my earlier posting. Please click the
   below link

  http://answers.splunk.com/questions/11145/its-getting-mysterious-to-m...
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  Have you tried downloading the source for PyODBC and compiling it
  yourself? All you need to do is python setup.py install. My guess
  would be that it works just fine on 64-bit Python 2.6, they just never
  released a re-compiled version of it for that platform.- Hide quoted text -

  - Show quoted text -

  Thanks Benjamin. Please point me to the website from where i can
  download pyodbc for Windows 64 bit OS under Python 2.6 and
  installation instructions
  --

 You don't download it for 64-bit Windows with Python 2.6. You download
 the source code from the website and make the Python 2.6, 64-bit
 Windows version yourself.

 Download the source zip file and extract it. Then, open up the command
 prompt and use the cd command to change directories to that source
 folder. For instance, if the source code has been extracted to
 C:\pyodbc-2.1.8\, you type in cd C:\pyodbc-2.1.8 and press enter.

 After that, you just run the build script which is already in there:

 C:\Python26\python26.exe setup.py install

 You'll need to have Visual C++ 2008 (not 2010) installed for this to
 work. You can get it for free 
 fromhttp://www.microsoft.com/express/Downloads/if you don't already have
 it.



 http://mail.python.org/mailman/listinfo/python-list- Hide quoted text -

 - Show quoted text -- Hide 

Re: Use the Source Luke

[Tim Wintle]

On Sat, 2011-01-29 at 21:17 -0800, Raymond Hettinger wrote:
 My thesis is that we can do even better than that by adding
 direct links from the docs to the relevant code with nice
 syntax highlighting.

+1 - I think the source links are very useful (and thanks for pushing
them).


However I think the biggest changes that have probably happened with
python itself are:

 (1) More users for whom this is their first language.
 (2) CS courses / training not teaching C (or pointer-based languages).

(2) is especially important IMO - under half of the python developers I
have regularly worked with would feel comfortable reading C - so for the
other half reading C source code probably isn't going to help them
understand exactly what's going on (although in the long run it might
help them a lot)


Tim Wintle

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Re: Use the Source Luke

[rantingrick]

On Jan 30, 2:53 am, Steven D'Aprano steve
+comp.lang.pyt...@pearwood.info wrote:

 In fact, Google
 themselves offer a desktop app that does just that:

 http://desktop.google.com/features.html

Yes, but at the expense of your privacy! How much private information
is being sent back to Google plex an used to flash more click ads at
you? Well i guess we could say, google does spam us, but at least we
are more likely to be *slightly* interested in the spam.

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Re: Use the Source Luke

[rusi]

On Jan 30, 6:19 pm, David Boddie da...@boddie.org.uk wrote:

 You might find this page useful:

 http://www.wikinfo.org/index.php/Comparison_of_desktop_search_software

 David

Thanks for that link David

I note particularly the disclaimer that it was removed from wikipedia
[Like when your-unfavorite-TV-channel censors stuff you know it
deserves a second look ;-) ]
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Re: Is it possible to pass CSV Reader Object As Argument to another Python File ???

[rusi]

On Jan 30, 6:31 pm, bansi mail2ba...@gmail.com wrote:
 On Jan 28, 4:22 pm, Benjamin Kaplan benjamin.kap...@case.edu wrote:

  You'll need to have Visual C++ 2008 (not 2010) installed for this to
  work. You can get it for free 
  fromhttp://www.microsoft.com/express/Downloads/if
  you don't already have it.


 Thanks Benjamin. Wondering why i need to Visual C++ 2008 . What it has
 to do with Python?
 Isn't it possible to implement your suggestion without installing
 Visual C++ 2008 .


http://code.google.com/p/pyodbc/wiki/Building#Windows
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how to modify axis tick values exponential value location in matplotlib

[Rajendra prasad Gottipati]

Hi,

I am plotting the graph for long values like(267838484) so that its printing
the tick lables on axes as 2.6 , 2.8 and at the top its having a text like
e07 something like this, I want to move the display location of this
exponent (e07) as i am having trouble in having multiple y-axis as they are
getting mixed in text. like (e07 is written on top of e08 of other axis)

Can any one help me in getting this done? also i am having issue in getting
tick lables of x-axis while plotting with pylab.plot_date.


Regards
Raja
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Style question: Nicknames for deeply nested objects

[Gerald Britton]

Hi all,

Today I was thinking about a problem I often encounter.  Say that I
have (seems I often do!) a deeply nested object, by which I mean
object within object with object, etc.

For example:

   x = some.deeply.nested.object.method(some.other.deeply.nested.object.value)

Well, that's extreme but I've worked with code approaching that level
of nested-ness.  Now, consider two scenarios:

1. You need to call this thing many times with different arguments, so
you wind up with:

   x = some.deeply.nested.object.method(some.other.deeply.nested.object.value1)
   y = some.deeply.nested.object.method(some.other.deeply.nested.object.value2)
   z = some.deeply.nested.object.method(some.other.deeply.nested.object.value3)

2. You call it inside a loop:

   for item in some_iterable:
       x = 
some.deeply.nested.object.method(some.other.deeply.nested.object.value)

For one thing, I find the long lines unattractive at best and
error-prone at worst, especially if I also have

   some.other.deeply.nested.object.method

that I might confuse with the first.  To make it look better I might do this:

   _o = some.deeply.nested.object
   _o.method(_o.value)

which is fine, I suppose.

Then, putting on my company hat, I remembered that, from VBA, you could do this:

   with some.deeply.nested.object
       .method(.value)
   end with

I like the structure of this, since the subordinate block can be
indented, which makes it stand out.  Also, it avoids temporary
variables.

So, I was thinking of how to get close to this in Python.  I came up
with two approaches:

1.

   _o = some.deeply.nested.object
   if 1:
       _o.method(_o.value)

The if 1: forces me to indent the subordinate code, which sets it
apart from the surrounding code.  Note that I cannot just
indent because I feel like it since Python is persnickety about indentation.

2.

for _o in [some.deeply.nested.object]:
       _o.method(_o.value)

The for... sets up the iterator and forces me to indent the subordinate code.

As an aside, approach 1 generates less byte-code since approach 2 sets
up loop machinery which you don't really need in this case.

I have a couple of questions:

1. If you had to choose between approaches 1 and 2, which one would
you go for, and why?

2. What other techniques have you used in such a situation?


--
Gerald Britton
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Re: Style question: Nicknames for deeply nested objects

[rantingrick]

On Jan 30, 11:51 am, Gerald Britton gerald.brit...@gmail.com wrote:

[...]

 that I might confuse with the first.  To make it look better I might do this:

    _o = some.deeply.nested.object
    _o.method(_o.value)

 which is fine, I suppose.

It is very fine. And you supposed correctly!


 Then, putting on my company hat, I remembered that, from VBA, you could do 
 this:

    with some.deeply.nested.object
        .method(.value)
    end with

 I like the structure of this, since the subordinate block can be
 indented, which makes it stand out.  Also, it avoids temporary
 variables.

Yes it is a good idea! Well forgetting the horrendous VBA syntax this
is. I brought this up many moons back as a feature request: Local
Blocks. Here is how a pythonic local block would look

with this as localvar:
localvar.do_something()


 So, I was thinking of how to get close to this in Python.  I came up
 with two approaches:

 1.

    _o = some.deeply.nested.object
    if 1:
        _o.method(_o.value)

bad idea!


 2.

     for _o in [some.deeply.nested.object]:
        _o.method(_o.value)

even worse idea!


 I have a couple of questions:

 1. If you had to choose between approaches 1 and 2, which one would
 you go for, and why?

neither! Stick with the original.
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Re: how to modify axis tick values exponential value location in matplotlib

[Rajendra prasad Gottipati]

it seems relevant to my issue.

http://stackoverflow.com/questions/3677368/matplotlib-format-axis-offset-values-to-whole-numbers-or-specific-number

On Sun, Jan 30, 2011 at 9:45 AM, Rajendra prasad Gottipati 
rajendra4li...@gmail.com wrote:

 Hi,

 I am plotting the graph for long values like(267838484) so that its
 printing the tick lables on axes as 2.6 , 2.8 and at the top its having a
 text like e07 something like this, I want to move the display location of
 this exponent (e07) as i am having trouble in having multiple y-axis as they
 are getting mixed in text. like (e07 is written on top of e08 of other axis)

 Can any one help me in getting this done? also i am having issue in getting
 tick lables of x-axis while plotting with pylab.plot_date.


 Regards
 Raja

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Re: Style question: Nicknames for deeply nested objects

[Roy Smith]

In article mailman.1469.1296409883.6505.python-l...@python.org,
 Gerald Britton gerald.brit...@gmail.com wrote:

 1. You need to call this thing many times with different arguments, so
 you wind up with:
 
    x = 
 some.deeply.nested.object.method(some.other.deeply.nested.object.value1)
    y = 
 some.deeply.nested.object.method(some.other.deeply.nested.object.value2)
    z = 
 some.deeply.nested.object.method(some.other.deeply.nested.object.value3)

I would probably turn that into:

object = some.deeply.nested.object
object.method(object.value1)
object.method(object.value2)
object.method(object.value3)

i.e. make the temporary variable have the exact same name as the last 
component of the deeply nested thing you're trying to refactor.  If the 
scope of use is small and the meaning is obvious from context, sometimes 
I'll shorten the name, i.e.

 obj = some.deeply.nested.object

or even

 o = some.deeply.nested.object

but I tend to avoid doing that.  I'd rather be a little more verbose in 
preference to being a little more cryptic.
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Re: Style question: Nicknames for deeply nested objects

[Stephen Hansen]

On 1/30/11 9:51 AM, Gerald Britton wrote:
 1. If you had to choose between approaches 1 and 2, which one would
 you go for, and why?

Neither. Ideally, I'd tweak the API around so the deeply nested
structure isn't something I need to access regularly. But! If you can't
do that, I'd do something like:

--- start
from contextlib import contextmanager

class Item(object): pass

deeply = Item()
deeply.nested = Item()
deeply.nested.thing = Item()

@contextmanager
def my(thing):
yield thing


with my(deeply.nested.thing) as o:
o.hello = 1

print deeply.nested.thing.hello
--- end

That's a dummy context-manager which basically does nothing: it just
abuses the context manager protocol to basically make a local variable
and indent its usage. Its really just a run-around and slightly less
efficient to do:

_o = some.deeply.nested.object
_o.method(_o.value)

But with the whitespace added on.

Personally, I'd usually just make a local variable and skip any tricks.

-- 

   Stephen Hansen
   ... Also: Ixokai
   ... Mail: me+list/python (AT) ixokai (DOT) io
   ... Blog: http://meh.ixokai.io/



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Re: Style question: Nicknames for deeply nested objects

[rantingrick]

On Jan 30, 12:23 pm, Stephen Hansen me+list/pyt...@ixokai.io wrote:

 --- start
 from contextlib import contextmanager

 class Item(object): pass

 deeply = Item()
 deeply.nested = Item()
 deeply.nested.thing = Item()

 @contextmanager
 def my(thing):
     yield thing

 with my(deeply.nested.thing) as o:
     o.hello = 1

 print deeply.nested.thing.hello
 --- end

Well congratulations Stephen, you win the obfuscation prize of the
year!
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Re: Style question: Nicknames for deeply nested objects

[Stephen Hansen]

On 1/30/11 10:35 AM, rantingrick wrote:
 Well congratulations Stephen, you win the obfuscation prize of the
 year!

Yes,

On 1/30/11 10:09 AM, rantingrick wrote:
 Here is how a pythonic local block would look

 with this as localvar:
 localvar.do_something()

verses

with my(this) as localvar:
localvar.do_something()

Is dreadfully more, er, obfuscated.

I mean someone would have to know what the 'my' function does to
understand what's going on!

OH MY GOD. How can someone be expected to understand what a function does!

Be serious! You can't expect that of them.

-- 

   Stephen Hansen
   ... Also: Ixokai
   ... Mail: me+list/python (AT) ixokai (DOT) io
   ... Blog: http://meh.ixokai.io/



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Understanding def foo(*args)

[sl33k_]

Hi,

I am struggling to grasp this concept about def foo(*args). Also, what
is def bar(*args, *kwargs)?

Isnt it like self must be the first parameter to the method/function?
If not what are the exceptions?

Also, can the terms method and function be used interchangeably?

TIA
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Re: Understanding def foo(*args)

[sl33k_]

Sorry that parameter is **kwargs.
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Re: Understanding def foo(*args)

[rantingrick]

On Jan 30, 1:26 pm, sl33k_ ahsanbag...@gmail.com wrote:
 Hi,

 I am struggling to grasp this concept about def foo(*args). Also, what
 is def bar(*args, *kwargs)?

FYI: the python intepretor is your friend!

py def foo(*args):
print args

py foo(1)
(1,)

py foo(1,2,3)
(1, 2, 3)

py foo(1,[1,23], {'hat':'cat'})
(1, [1, 23], {'hat': 'cat'})

py def bar(*args, **kw):
print 'Args:', args
print 'Kwds:', kw

py bar(1,2,3, hat='cat', spam='eggs')
Args: (1, 2, 3)
Kwds: {'hat': 'cat', 'spam': 'eggs'}


 Isnt it like self must be the first parameter to the method/function?
 If not what are the exceptions?

Only *must* with methods!

 Also, can the terms method and function be used interchangeably?

Can the terms cars and truck be used interchangeably?

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Re: Understanding def foo(*args)

[Mel]

sl33k_ wrote:

 Hi,
 
 I am struggling to grasp this concept about def foo(*args). Also, what
 is def bar(*args, *kwargs)?
 
 Isnt it like self must be the first parameter to the method/function?
 If not what are the exceptions?
 
 Also, can the terms method and function be used interchangeably?
 
 TIA

Try

def foo (*args):
print 'foo args:', repr (args)

foo (1, 2, 3, 4)

def bar (*args, **kwargs):
print 'bar args:', args
print 'bar kwargs:', kwargs

bar (1, 2, 3, 4)
bar (1, 2, 3, baz=6, boz=None)


Mel.

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Re: Understanding def foo(*args)

[Chris Rebert]

On Sun, Jan 30, 2011 at 11:26 AM, sl33k_ ahsanbag...@gmail.com wrote:
 Hi,

 I am struggling to grasp this concept about def foo(*args).

The interactive interpreter is your friend! Try experimenting with it next time!

http://docs.python.org/tutorial/controlflow.html#arbitrary-argument-lists
That `def` defines a variadic function; i.e. a function which takes an
arbitrary number of positional arguments.
`args` will be a tuple of all the positional arguments passed to the function:
 def foo(*args):
... print args
...
 foo(1)
(1,)
 foo(1,2)
(1, 2)
 foo(1,2,3)
(1, 2, 3)

If positional parameters precede the *-parameter, then they are
required and the *-parameter will receive any additional arguments:
 def qux(a, b, *args):
... print 'a is', a
... print 'b is', b
... print 'args is', args
...
 qux(1)
Traceback (most recent call last):
  File stdin, line 1, in module
TypeError: qux() takes at least 2 arguments (1 given)
 qux(1, 2)
a is 1
b is 2
args is ()
 qux(1, 2, 3)
a is 1
b is 2
args is (3,)
 qux(1, 2, 3, 4)
a is 1
b is 2
args is (3, 4)

 Also, what is def bar(*args, *kwargs)?

You meant: def bar(*args, **kwargs)

See http://docs.python.org/tutorial/controlflow.html#keyword-arguments
Basically, the **-parameter is like the *-parameter, except for
keyword arguments instead of positional arguments.

 Also, can the terms method and function be used interchangeably?

No. A method is function that is associated with an object (normally
via a class) and takes this object as its first argument (typically
named self). A function does not have any of these requirements.
Thus, all method are functions, but the reverse is not true.
(I'm ignoring complexities like classmethods and staticmethods for simplicity.)

Cheers,
Chris
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Re: Understanding def foo(*args)

[Ulrich Eckhardt]

sl33k_ wrote:
 Isnt it like self must be the first parameter to the method/function?

self is just customary as first parameter to memberfunctions, the 
language itself doesn't impose this convention, as e.g. C++ does with its 
this.


 Also, can the terms method and function be used interchangeably?

This distinction doesn't exist in Python. You can put a reference to a 
free function as attribute in an object. You can store a reference to a 
bound memberfunction outside the object and call it.

Objects and classes here are much more flexible than in C++ or Java.

Uli

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Re: Style question: Nicknames for deeply nested objects

[Ian]

On 30/01/2011 17:51, Gerald Britton wrote:

Hi all,

Today I was thinking about a problem I often encounter.  Say that I
have (seems I often do!) a deeply nested object, by which I mean
object within object with object, etc.

For example:

x = some.deeply.nested.object.method(some.other.deeply.nested.object.value)

Well, that's extreme but I've worked with code approaching that level
of nested-ness.  Now, consider two scenarios:

1. You need to call this thing many times with different arguments, so
you wind up with:

x = some.deeply.nested.object.method(some.other.deeply.nested.object.value1)
y = some.deeply.nested.object.method(some.other.deeply.nested.object.value2)
z = some.deeply.nested.object.method(some.other.deeply.nested.object.value3)


Neither.  You should tell. Don't ask if you can avoid it.

Compare...

queen.getButter()

and
queen.dairymaid.alderney.getButter()

see  http://www.timelessteacherstuff.com/readerstheater/KingsBreakfast.pdf

king doesn't care where or how the butter is brought.  Neither should 
your code!


What are you doing with value1, value2 and value3 when you have them 
anyway? Stuffing them 3 levels deep into something else?


Stop writing procedural code, and write object oriented code instead!

If you you make some tell  deeply.nested.object  about 
other.deeply.nested.object it can fetch its own values, but it might be 
better
to have some tell other.deeply.nested.object about deeply.nested.object 
to it can issue the correct commands.


Then you tell some to  do Somthing by writing

  some.takeMeaningfullAction()

and it all happens under the covers.

Regards

Ian
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homedir, file copy

[ecu_jon]

hello,
i am trying to work with windows homedirectory as a starting point for
some kind of file copy command. i'm testing this on a win7 box so my
home is c:\Users\jon\
here is the code snippet i am working on:

import os

homedir = os.path.expanduser('~')
try:
from win32com.shell import shellcon, shell
homedir = shell.SHGetFolderPath(0, shellcon.CSIDL_APPDATA, 0, 0)

except ImportError:
homedir = os.path.expanduser(~)
print homedir
print os.listdir(homedir+\\backup\\)
homedir.replace( , \\)
print homedir
shutil.copy (homedir+\\backup\\, homedir+\\backup2\\)


output looks like:
C:\Users\jon
['test1.txt', 'test2.txt']
C:\Users\jon

Traceback (most recent call last):
  File D:\spring 11\capstone-project\date.py, line 43, in module
shutil.copy (homedir+\\backup\\, homedir+\\backup2\\)
  File C:\Python27\lib\shutil.py, line 116, in copy
copyfile(src, dst)
  File C:\Python27\lib\shutil.py, line 81, in copyfile
with open(src, 'rb') as fsrc:
IOError: [Errno 2] No such file or directory: 'C:\\Users\\jon\\backup\
\'


why is there still two \\ in the pathfor the copy command?
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Re: homedir, file copy

[r]

On Jan 30, 2:44 pm, ecu_jon hayesjd...@yahoo.com wrote:

 shutil.copy (homedir+\\backup\\, homedir+\\backup2\\)

TIP: Use os.path.join(x,y, z*)

 why is there still two \\ in the pathfor the copy command?

I always convert my paths to use a single '/' instead of '\\'. Just
makes life that much easier!

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Re: homedir, file copy

[Chris Rebert]

On Sun, Jan 30, 2011 at 12:44 PM, ecu_jon hayesjd...@yahoo.com wrote:
 hello,
 i am trying to work with windows homedirectory as a starting point for
 some kind of file copy command. i'm testing this on a win7 box so my
 home is c:\Users\jon\
 here is the code snippet i am working on:

 import os

 homedir = os.path.expanduser('~')
 try:
    from win32com.shell import shellcon, shell
    homedir = shell.SHGetFolderPath(0, shellcon.CSIDL_APPDATA, 0, 0)

 except ImportError:
    homedir = os.path.expanduser(~)
 print homedir
 print os.listdir(homedir+\\backup\\)
 homedir.replace( , \\)
 print homedir
 shutil.copy (homedir+\\backup\\, homedir+\\backup2\\)


 output looks like:
 C:\Users\jon
 ['test1.txt', 'test2.txt']
 C:\Users\jon

 Traceback (most recent call last):
  File D:\spring 11\capstone-project\date.py, line 43, in module
    shutil.copy (homedir+\\backup\\, homedir+\\backup2\\)
  File C:\Python27\lib\shutil.py, line 116, in copy
    copyfile(src, dst)
  File C:\Python27\lib\shutil.py, line 81, in copyfile
    with open(src, 'rb') as fsrc:
 IOError: [Errno 2] No such file or directory: 'C:\\Users\\jon\\backup\
 \'


 why is there still two \\ in the pathfor the copy command?

There aren't. The error message is just showing the repr() of the
string, which involves escaping any literal backslashes in it; note
the quotes around the path in the error message.
Details on repr(): http://docs.python.org/library/functions.html#repr

By way of example:
 x = raw_input()
C:\foo\bar
 print x
C:\foo\bar
 print repr(x)
'C:\\foo\\bar'
 print('C:\\foo\\bar')
C:\foo\bar

Note that you can use forward slashes instead of backslashes in
Windows paths in Python, thus avoiding this confusion altogether.

Cheers,
Chris
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Re: Style question: Nicknames for deeply nested objects

[rantingrick]

On Jan 30, 12:53 pm, Stephen Hansen me+list/pyt...@ixokai.io wrote:
 On 1/30/11 10:35 AM, rantingrick wrote:

  Well congratulations Stephen, you win the obfuscation prize of the
  year!

 Yes,

 On 1/30/11 10:09 AM, rantingrick wrote:

  Here is how a pythonic local block would look

  with this as localvar:
      localvar.do_something()

 verses

 with my(this) as localvar:
     localvar.do_something()

 Is dreadfully more, er, obfuscated.

Absolutely!

 I mean someone would have to know what the 'my' function does to
 understand what's going on!

Yes, and also how decorators word and generators work, and ...

 OH MY GOD. How can someone be expected to understand what a function does!

Yes, and also how decorators word and generators work, and ...

 Be serious! You can't expect that of them.

I don't. I don't expect anyone to write 10 lines of obfuscation code
when just two will suffice. Maybe you should join the perl group as
they would proud!

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Re: Style question: Nicknames for deeply nested objects

[Jerry Hill]

 I don't. I don't expect anyone to write 10 lines of obfuscation code
 when just two will suffice. Maybe you should join the perl group as
 they would proud!


But Stephen's 10 lines of somewhat obscure code actually works, and your two
lines of code doesn't.  I know which one I would prefer.

-- 
Jerry
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Re: Style question: Nicknames for deeply nested objects

[Steven D'Aprano]

On Sun, 30 Jan 2011 12:51:20 -0500, Gerald Britton wrote:

 Hi all,
 
 Today I was thinking about a problem I often encounter.  Say that I have
 (seems I often do!) a deeply nested object, by which I mean object
 within object with object, etc.
 
 For example:
 
    x =
    some.deeply.nested.object.method
(some.other.deeply.nested.object.value)
 
 Well, that's extreme but I've worked with code approaching that level of
 nested-ness.

Then you're probably living in a state of sin, programming-wise, and you 
should stop doing that! You are violating the Law of Demeter. One dot, 
good. Two, acceptable. Three is a code smell. Four is a code reek.

The Law of Demeter (more of a guideline than a law, really) says:

If you want to get your dog to walk, call the dog. Don't talk to its 
legs, it confuses the dog and doesn't get it anywhere.

http://en.wikipedia.org/wiki/Law_of_Demeter

Another analogy: if you have to pay the paperboy for delivering the 
newspaper, you don't let him reach into your pocket, take out your 
wallet, open the wallet, take out whatever money he feels like, and put 
the wallet back.

http://www.ccs.neu.edu/research/demeter/demeter-method/LawOfDemeter/paper-
boy/demeter.pdf


Despite my comment above, the Law of Demeter is not *really* a dot-
counting exercise, although that's a handy short-cut for detecting 
potential problems. It can also apply to other data structures. If you've 
every seen C or Pascal code where you have a pointer to a pointer to a 
pointer to a pointer to a pointer to a pointer to some data, you've seen 
a violation.

Consider your example:

some.other.deeply.nested.object.value

This is very tightly coupled code: the caller, who knows about the object 
`some`, needs to know the internal details of not just `some` but also 
`other`, `deeply`, `nested`, and `object`. As a basic principle, this is 
poor design! Which would you rather deal with?

car.start()

car.ignition.turn(key).connect(car.starter(battery), car.spark_plug)

In particular, using temporary variables merely disguises the problem:

temp = some.other
temp = temp.deeply.nested
x = temp.object.value

Even though you never use more than two dots, you still have tight 
coupling. The point of Demeter is not to save dots (they're a renewable 
resource) but to reduce tight coupling.


-- 
Steven
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Re: WxPython versus Tkinter.

[Littlefield, Tyler]

Are you a representative voice for all the screen reader users? (Even 
though

most of them use JAWS that you don't seem to like)
Newsflash: I didn't say I didn't like Jaws, and I'm using Jaws -right 
now-. I don't like jaws and see a lot of future for NVDA as it is both 
free and open source. I like that a lot more than paying what, $1300 or 
so for a program that will allow me to use the computer? Plus the 
obligatory $260 for two updates so I can update once every four months, 
regardless of whether or not I want to update. If you want to rant and 
scream about accessibility, yell at the people charging an arm and a leg 
to make things accessible.

On 1/28/2011 1:33 AM, Octavian Rasnita wrote:

From: Littlefield, Tyler ty...@tysdomain.com

* Disclaimer: You are stupid if you think this is true. But seriously,
Octavian makes it REALLY hard to continue caring about something that I
actually cared about before and thought was important.


When I told about what the community of the blind from my country 
cares, or
what I care, the others told me that that is not important. I am sure 
that
won't say the same thing to your post in which you also say about what 
you

care, just because you have the same opinions like them.


People like Octavian do that. Sadly, it is one of the things holding the
blind community back. I hope that with my arguments (for those that 
didn't

just toss everything related to this thread), I have been able to get
people to see a little differently and not consider Octavian as the 
voice

for us all.



Who are those us all?
Are you a representative voice for all the screen reader users? (Even 
though

most of them use JAWS that you don't seem to like)
Or do you agree with the associations of the blind in your country do 
when
they fight with different companies because they make discrimination 
by not

offering accessible products?
Or you are more representative than those associations?

Octavian




--

Thanks,
Ty

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Re: Understanding def foo(*args)

[Ben Finney]

sl33k_ ahsanbag...@gmail.com writes:

 I am struggling to grasp this concept about def foo(*args). Also, what
 is def bar(*args, *kwargs)?

Please work through the Python Tutorial from start to finish
URL:http://docs.python.org/tutorial/, performing each exercise and
experimenting with it until you understand. You will then have a good
grounding in basics of the language like this.

-- 
 \ Lucifer: “Just sign the Contract, sir, and the Piano is yours.” |
  `\ Ray: “Sheesh! This is long! Mind if I sign it now and read it |
_o__)later?” —http://www.achewood.com/ |
Ben Finney
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Re: homedir, file copy

[ecu_jon]

On Jan 30, 3:55 pm, r rt8...@gmail.com wrote:
 On Jan 30, 2:44 pm, ecu_jon hayesjd...@yahoo.com wrote:

  shutil.copy (homedir+\\backup\\, homedir+\\backup2\\)

 TIP: Use os.path.join(x,y, z*)

  why is there still two \\ in the pathfor the copy command?

 I always convert my paths to use a single '/' instead of '\\'. Just
 makes life that much easier!

what does this mean?  Use os.path.join(x,y, z*)
what is the x,y,z?
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Re: homedir, file copy

[Chris Rebert]

On Sun, Jan 30, 2011 at 3:13 PM, ecu_jon hayesjd...@yahoo.com wrote:
 On Jan 30, 3:55 pm, r rt8...@gmail.com wrote:
 On Jan 30, 2:44 pm, ecu_jon hayesjd...@yahoo.com wrote:

  shutil.copy (homedir+\\backup\\, homedir+\\backup2\\)

 TIP: Use os.path.join(x,y, z*)

  why is there still two \\ in the pathfor the copy command?

 I always convert my paths to use a single '/' instead of '\\'. Just
 makes life that much easier!

 what does this mean?  Use os.path.join(x,y, z*)
 what is the x,y,z?

See http://docs.python.org/library/os.path.html#os.path.join
e.g. in your case:
backupdir = os.path.join(homedir, backup)

Cheers,
Chris
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Re: homedir, file copy

[rantingrick]

On Jan 30, 5:13 pm, ecu_jon hayesjd...@yahoo.com wrote:

 what does this mean?  Use os.path.join(x,y, z*)
 what is the x,y,z?

x,y, and z in this case are just generic variables. Consider x+y=10. x
and y could both equal 5 or any number of combinations of two numbers
who sum equals ten. Anyway see the link chris posted to the docs or
fire up your python shell and try this...


 import sys
 sys.version_info
(2, 6, 5, 'final', 0) # yours may be different!
 folder = 'C:/somepath/to/folder'
 filename = 'somefile.txt'
 import os
 help(os.path.join)
Help on function join in module ntpath:

join(a, *p)
Join two or more pathname components, inserting \ as needed.
If any component is an absolute path, all previous path components
will be discarded.

 os.path.join(folder, filename)
'C:/somepath/to/folder\\somefile.txt'
 help(os.path.normpath)
Help on function normpath in module ntpath:

normpath(path)
Normalize path, eliminating double slashes, etc.

 os.path.normpath(os.path.join(folder, filename))
'C:\\some\\path\\to\\folder\\somefile.txt'

psst: i know what you're thinking... and yes, python is very cool!
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Re: homedir, file copy

[ecu_jon]

ok now i get permission denied

import os
homedir = os.path.expanduser('~')
try:
from win32com.shell import shellcon, shell
homedir = shell.SHGetFolderPath(0, shellcon.CSIDL_APPDATA, 0, 0)

except ImportError:
homedir = os.path.expanduser(~)
print homedir
print os.listdir(homedir+\\backup\\)
#homedir.replace( , \\)
#print homedir
backupdir1 = os.path.join(homedir, backup)
backupdir2 = os.path.join(homedir, backup2)
shutil.copy (backupdir1, backupdir2)

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Re: WxPython versus Tkinter.

[rantingrick]

On Jan 28, 9:15 am, Littlefield, Tyler ty...@tysdomain.com wrote:

 If you want to rant and scream about accessibility, yell at the
 people charging an arm and a leg to make things accessible.


You make a good point as we could always use more opensource, free,
and reasonably priced software. However unless the GUI library in
question supports accessibility, it really won't matter how much the
tool costs if you cannot use it! Consider if automobiles were free
however gasoline was obsolete.

-- rr: spreading common sense like an incurable virus.
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Re: homedir, file copy

[MRAB]

On 30/01/2011 23:43, ecu_jon wrote:

ok now i get permission denied

import os
homedir = os.path.expanduser('~')
try:
 from win32com.shell import shellcon, shell
 homedir = shell.SHGetFolderPath(0, shellcon.CSIDL_APPDATA, 0, 0)

except ImportError:
 homedir = os.path.expanduser(~)
print homedir
print os.listdir(homedir+\\backup\\)
#homedir.replace( , \\)
#print homedir
backupdir1 = os.path.join(homedir, backup)
backupdir2 = os.path.join(homedir, backup2)
shutil.copy (backupdir1, backupdir2)


shutil.copy(...) copies files, not directories. You should use
shutil.copytree(...) instead.
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Re: homedir, file copy

[ecu_jon]

On Jan 30, 7:09 pm, MRAB pyt...@mrabarnett.plus.com wrote:
 On 30/01/2011 23:43, ecu_jon wrote:

  ok now i get permission denied

  import os
  homedir = os.path.expanduser('~')
  try:
       from win32com.shell import shellcon, shell
       homedir = shell.SHGetFolderPath(0, shellcon.CSIDL_APPDATA, 0, 0)

  except ImportError:
       homedir = os.path.expanduser(~)
  print homedir
  print os.listdir(homedir+\\backup\\)
  #homedir.replace( , \\)
  #print homedir
  backupdir1 = os.path.join(homedir, backup)
  backupdir2 = os.path.join(homedir, backup2)
  shutil.copy (backupdir1, backupdir2)

 shutil.copy(...) copies files, not directories. You should use
 shutil.copytree(...) instead.

i will, closer towards the end.
just wanted to get past the naming stuff, the problem above.
right now i just want to see it move files from 1 place to another.
i had copytree in before, and will go back to that for final version.
im working on a backup program, and copytree looks yummy.

still no idea why getting permission denied.
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Re: homedir, file copy

[Dave Angel]

On 01/-10/-28163 02:59 PM, ecu_jon wrote:

ok now i get permission denied

import os
homedir = os.path.expanduser('~')
try:
 from win32com.shell import shellcon, shell
 homedir = shell.SHGetFolderPath(0, shellcon.CSIDL_APPDATA, 0, 0)

except ImportError:
 homedir = os.path.expanduser(~)
print homedir
print os.listdir(homedir+\\backup\\)
#homedir.replace( , \\)
#print homedir
backupdir1 = os.path.join(homedir, backup)
backupdir2 = os.path.join(homedir, backup2)
shutil.copy (backupdir1, backupdir2)


You forgot to include the error traceback.

So, is homedir/backup a file, or is it a directory?  If you're trying to 
copy whole directories, you might want to look at copytree instead.


If you're not sure, you could use
os.isfile()

to check.  If that's false, then shutil.copy() can't work.  Similarly, 
if the destination is a readonly file, you'd get some error.


DaveA



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MS Access table values as input into a formula in another table-need help!!

[Cathy James]

Dear Python Community,

Table1:
Prop_codeR_Value
GC 0.8
CI 0.6
LDR 0.4
HDR 0.6
TR 0.65
CR 0.35

Table 2:
O_ID PROP_CODE AI  TArea  R_Value Pre_R_Value IR
MER02006 LDR 38.19235 132.3178 0.4 0.115456 0.555143
MER02006 TR 20.78983 132.3178 0.65 0.102128 0.555143
MER02006 UO 1.850129 132.3178 0.25 0.003496 0.555143
MER03001 GC 16.565  137.592  0.8 0.096314 0.45027
Initially, I manually entered R_Value from table 1 into table 2 in order to
later compute subsequent fields using Python. Now I’d like to make the
process a bit more automatic. I would like to get R_Values  for each
Prop_Code  from table 1 into table 2 so that I can use them in a Table2
computation later on. I was thinking maybe a putting table 1 into a dict
then use those values in table 2, but I need help getting started. Just
learning Python and dicts are still tricky for me. Please help me modify the
code below so that i don't have to repeat the lines of code below for all
values of Prop_Code:
import arcpy,sys
arcpy.env.workspace = C:\\test\\DRAINAGE.mdb
Table1= basins
Table2=CV_Table
cur = arcpy.UpdateCursor(table2, [PROP_CODE] = 'LDR')
row = cur.next()
# Perform the update and move to the next row as long as there are
#  rows left
while row:
row.R_Value  = 0 #initialize field from nulls to zero values
row.R_Value = 0.4 #INstead, I need to get this from Table 2
cur.updateRow(row)
row = cur.next()
# Delete the cursors to remove any data locks
del row, cur

THANKS!!
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Re: homedir, file copy

[ecu_jon]

On Jan 30, 7:19 pm, Dave Angel da...@ieee.org wrote:
 On 01/-10/-28163 02:59 PM, ecu_jon wrote:

  ok now i get permission denied

  import os
  homedir = os.path.expanduser('~')
  try:
       from win32com.shell import shellcon, shell
       homedir = shell.SHGetFolderPath(0, shellcon.CSIDL_APPDATA, 0, 0)

  except ImportError:
       homedir = os.path.expanduser(~)
  print homedir
  print os.listdir(homedir+\\backup\\)
  #homedir.replace( , \\)
  #print homedir
  backupdir1 = os.path.join(homedir, backup)
  backupdir2 = os.path.join(homedir, backup2)
  shutil.copy (backupdir1, backupdir2)

 You forgot to include the error traceback.

 So, is homedir/backup a file, or is it a directory?  If you're trying to
 copy whole directories, you might want to look at copytree instead.

 If you're not sure, you could use
      os.isfile()

 to check.  If that's false, then shutil.copy() can't work.  Similarly,
 if the destination is a readonly file, you'd get some error.

 DaveA

today's date is :  30
week chosen is :  4
C:\Users\jon
['test1.txt', 'test2.txt']

Traceback (most recent call last):
  File D:\spring 11\capstone-project\date.py, line 45, in module
shutil.copy (backupdir1, backupdir2)
  File C:\Python27\lib\shutil.py, line 116, in copy
copyfile(src, dst)
  File C:\Python27\lib\shutil.py, line 81, in copyfile
with open(src, 'rb') as fsrc:
IOError: [Errno 13] Permission denied: 'C:\\Users\\jon\\backup'
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Re: homedir, file copy

[rantingrick]

On Jan 30, 5:43 pm, ecu_jon hayesjd...@yahoo.com wrote:
 ok now i get permission denied

[...]

 shutil.copy (backupdir1, backupdir2)

I must stress the importance of proper testing before ever running
code that manipulates files! So many things can go wrong. Of course
you are just copying files here and not deleting them however you must
always be in the habit of treating files like explosives. And frankly
you're being quite nonchalant with this very naive approach to coding
and complete lack of testing.

When handling files always test, test, test. Never actually move,
copy, or delete until you are *absolutely* sure no failures will
occur. I will always do test runs that print out the action but DO NOT
actually DO the action, like...

Copying files:
 -- from: C:\\somefile1
  to: C:\\blah\\somefile1
 -- from: C:\\somefile2
  to: C:\\blah\\somefile2
 -- from: C:\\somefile3
  to: C:\\blah\\somefile3
 -- etc...

Once my test runs are bug free i can try to move or delete *one* file
from some test set. Once that is bug free then i will try the code on
many files of a test set, and ONLY THEN on the real thing. I guarantee
if you keep manipulating files in such a haphazard way you will live
to regret it!



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Re: homedir, file copy

[ecu_jon]

On Jan 30, 7:34 pm, rantingrick rantingr...@gmail.com wrote:
 On Jan 30, 5:43 pm, ecu_jon hayesjd...@yahoo.com wrote:

  ok now i get permission denied

 [...]

  shutil.copy (backupdir1, backupdir2)

 I must stress the importance of proper testing before ever running
 code that manipulates files! So many things can go wrong. Of course
 you are just copying files here and not deleting them however you must
 always be in the habit of treating files like explosives. And frankly
 you're being quite nonchalant with this very naive approach to coding
 and complete lack of testing.

 When handling files always test, test, test. Never actually move,
 copy, or delete until you are *absolutely* sure no failures will
 occur. I will always do test runs that print out the action but DO NOT
 actually DO the action, like...

 Copying files:
  -- from: C:\\somefile1
       to: C:\\blah\\somefile1
  -- from: C:\\somefile2
       to: C:\\blah\\somefile2
  -- from: C:\\somefile3
       to: C:\\blah\\somefile3
  -- etc...

 Once my test runs are bug free i can try to move or delete *one* file
 from some test set. Once that is bug free then i will try the code on
 many files of a test set, and ONLY THEN on the real thing. I guarantee
 if you keep manipulating files in such a haphazard way you will live
 to regret it!

not nonchalant.
i know i will ned to do testing and whatnot.
just personally, i like to build stuff one concept at a time.
for example, i had a problem with the homedir and peopel here helped
me with that.
now i have permissions problem, and an swer will likely meeerge.
once i know how to copy a file, ill work on testing. like isfile and
permissions.
i know that has to be done. i guess its that you want tests before
moves , and thats fine.
since i have only ever had 1 python class, and basically learning this
whole thing from scratch, i need to do things 1 step at a time.
so now any thoughts on why i cannot write to my own homedir?
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Re: homedir, file copy

[Westley Martínez]

It seems like you are trying to copy directories with shutil.copy. Use
shutil.copytree instead.

On Sun, 2011-01-30 at 16:43 -0800, ecu_jon wrote:

 On Jan 30, 7:34 pm, rantingrick rantingr...@gmail.com wrote:
  On Jan 30, 5:43 pm, ecu_jon hayesjd...@yahoo.com wrote:
 
   ok now i get permission denied
 
  [...]
 
   shutil.copy (backupdir1, backupdir2)
 
  I must stress the importance of proper testing before ever running
  code that manipulates files! So many things can go wrong. Of course
  you are just copying files here and not deleting them however you must
  always be in the habit of treating files like explosives. And frankly
  you're being quite nonchalant with this very naive approach to coding
  and complete lack of testing.
 
  When handling files always test, test, test. Never actually move,
  copy, or delete until you are *absolutely* sure no failures will
  occur. I will always do test runs that print out the action but DO NOT
  actually DO the action, like...
 
  Copying files:
   -- from: C:\\somefile1
to: C:\\blah\\somefile1
   -- from: C:\\somefile2
to: C:\\blah\\somefile2
   -- from: C:\\somefile3
to: C:\\blah\\somefile3
   -- etc...
 
  Once my test runs are bug free i can try to move or delete *one* file
  from some test set. Once that is bug free then i will try the code on
  many files of a test set, and ONLY THEN on the real thing. I guarantee
  if you keep manipulating files in such a haphazard way you will live
  to regret it!
 
 not nonchalant.
 i know i will ned to do testing and whatnot.
 just personally, i like to build stuff one concept at a time.
 for example, i had a problem with the homedir and peopel here helped
 me with that.
 now i have permissions problem, and an swer will likely meeerge.
 once i know how to copy a file, ill work on testing. like isfile and
 permissions.
 i know that has to be done. i guess its that you want tests before
 moves , and thats fine.
 since i have only ever had 1 python class, and basically learning this
 whole thing from scratch, i need to do things 1 step at a time.
 so now any thoughts on why i cannot write to my own homedir?


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Re: homedir, file copy

[MRAB]

On 31/01/2011 00:18, ecu_jon wrote:

On Jan 30, 7:09 pm, MRABpyt...@mrabarnett.plus.com  wrote:

On 30/01/2011 23:43, ecu_jon wrote:


ok now i get permission denied



import os
homedir = os.path.expanduser('~')
try:
  from win32com.shell import shellcon, shell
  homedir = shell.SHGetFolderPath(0, shellcon.CSIDL_APPDATA, 0, 0)



except ImportError:
  homedir = os.path.expanduser(~)
print homedir
print os.listdir(homedir+\\backup\\)
#homedir.replace( , \\)
#print homedir
backupdir1 = os.path.join(homedir, backup)
backupdir2 = os.path.join(homedir, backup2)
shutil.copy (backupdir1, backupdir2)


shutil.copy(...) copies files, not directories. You should use
shutil.copytree(...) instead.


i will, closer towards the end.
just wanted to get past the naming stuff, the problem above.
right now i just want to see it move files from 1 place to another.
i had copytree in before, and will go back to that for final version.
im working on a backup program, and copytree looks yummy.

still no idea why getting permission denied.


The path given by backupdir1 is a directory, so you're trying to use
shutil.copy(...) to copy a directory.

The reason that it's complaining about permissions is that shutil.copy
is trying to open the source file (look at the traceback) so that it
can copy the file's contents, but it's not a file, it's a directory.

CPython is written in C, so it's probably the underlying C library
which is reporting it as a permissions problem instead of a that's not
a file! problem. :-)
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Re: Is it possible to pass CSV Reader Object As Argument to another Python File ???

[rusi]

On Jan 30, 10:35 pm, rusi rustompm...@gmail.com wrote:
 On Jan 30, 6:31 pm, bansi mail2ba...@gmail.com wrote:
  Isn't it possible to implement your suggestion without installing
  Visual C++ 2008 .

 http://code.google.com/p/pyodbc/wiki/Building#Windows

Well... This is what the official site says...
On second thoughts I wonder: Would it not be possible to compile python
+pyodbc from source and use gcc/ming for that? Someone who knows more
of the windows build process may say something about the issues
involved.
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Limit on entries in dictionary data structure

[Shruti Sanadhya]

Hi,

I am running a script that uses dictionaries on Python 2.6.4 on Ubuntu 9.10.
I notice that my script crashes with a MemoryError when my dictionary
reaches 44739243th entry. My system has 3GB RAM (32-bit). I noticed that
changing the key or value types also did not help my code. For simplicity I
tried running this:

#BEGIN:python code
import sys
f={}
lsize=0
try:
for k in range(0,4*44739243):
f[k]=k
if sys.getsizeof(f)  lsize:
lsize = sys.getsizeof(f)
print k, lsize
except:
print k, lsize
raise
#END:python code

The code terminates with:
Traceback (most recent call last):
  File pydict-limit.py, line 6, in module
f[k]=k
MemoryError

I have also tried running this on Ubuntu 9.10 with Python 2.6.6 with 3.5GB
RAM(32-bit) and a 64-bit LINUX cluster machine with 62GB RAM and Python 2.4.
On both these machines it crashed at entry 44739243. The size of the data
structure grows to 1.5GB. On another 64-bit cluster machine with 32GB RAM
and Python 2.6.6 it crashed at entry 178956970. In this case the size of the
data structure grew to 6GB.

Has anybody encountered this before? Can somebody suggest any fix for this?
I am trying to read some 10GB network traces into a hash table(hence
dictionary) and need constant time lookup. Clearly increasing the machine
RAM does not work. Any suggestions would be greatly appreciated.

Thanks,
Shruti
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Re: homedir, file copy

[ecu_jon]

On Jan 30, 8:25 pm, MRAB pyt...@mrabarnett.plus.com wrote:
 On 31/01/2011 00:18, ecu_jon wrote:



  On Jan 30, 7:09 pm, MRABpyt...@mrabarnett.plus.com  wrote:
  On 30/01/2011 23:43, ecu_jon wrote:

  ok now i get permission denied

  import os
  homedir = os.path.expanduser('~')
  try:
        from win32com.shell import shellcon, shell
        homedir = shell.SHGetFolderPath(0, shellcon.CSIDL_APPDATA, 0, 0)

  except ImportError:
        homedir = os.path.expanduser(~)
  print homedir
  print os.listdir(homedir+\\backup\\)
  #homedir.replace( , \\)
  #print homedir
  backupdir1 = os.path.join(homedir, backup)
  backupdir2 = os.path.join(homedir, backup2)
  shutil.copy (backupdir1, backupdir2)

  shutil.copy(...) copies files, not directories. You should use
  shutil.copytree(...) instead.

  i will, closer towards the end.
  just wanted to get past the naming stuff, the problem above.
  right now i just want to see it move files from 1 place to another.
  i had copytree in before, and will go back to that for final version.
  im working on a backup program, and copytree looks yummy.

  still no idea why getting permission denied.

 The path given by backupdir1 is a directory, so you're trying to use
 shutil.copy(...) to copy a directory.

 The reason that it's complaining about permissions is that shutil.copy
 is trying to open the source file (look at the traceback) so that it
 can copy the file's contents, but it's not a file, it's a directory.

 CPython is written in C, so it's probably the underlying C library
 which is reporting it as a permissions problem instead of a that's not
 a file! problem. :-)

as for testing i was planning on using something like this
http://docs.python.org/library/shutil.html
scroll down to 10.10.1.1
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Re: Style question: Nicknames for deeply nested objects

[Stephen Hansen]

On 1/30/11 1:13 PM, rantingrick wrote:
 On Jan 30, 12:53 pm, Stephen Hansen me+list/pyt...@ixokai.io wrote:
 OH MY GOD. How can someone be expected to understand what a function does!
 
 Yes, and also how decorators word and generators work, and ...
 
 Be serious! You can't expect that of them.
 
 I don't. I don't expect anyone to write 10 lines of obfuscation code
 when just two will suffice. Maybe you should join the perl group as
 they would proud!

Riiight.

suffice doesn't mean what you think it means. Generally, if something
suffices -- it actually, you know, ... works.

My four lines of setup can get put into a library and treated as a
recipe if they don't want to get into understanding generators or
decorators: then its two lines to use, and those two lines are exactly
like your two lines except for two little details:

  1. They add a function call to the syntax.
  2. They actually work.

The OP doesn't have to understand decorators or generators if he doesn't
want to: though I encourage him to do so, as they are beautiful and
elegant tools that can very clearly and concisely help solve a lot of
problems.

Now, me? I wouldn't use the recipe, as I originally said in my response.
I'd just use a local variable. But the OP didn't like that, and he
wanted some indenting and whitespace to clearly demarcate where he
intended to use the local. So I gave him a way to do that.

You gave him... uh, what was it again?

Oh, right.

Nothing.

As usual.

-- 

   Stephen Hansen
   ... Also: Ixokai
   ... Mail: me+list/python (AT) ixokai (DOT) io
   ... Blog: http://meh.ixokai.io/



signature.asc
Description: OpenPGP digital signature
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Re: homedir, file copy

[Dave Angel]

On 01/-10/-28163 02:59 PM, ecu_jon wrote:

On Jan 30, 7:19 pm, Dave Angelda...@ieee.org  wrote:

On 01/-10/-28163 02:59 PM, ecu_jon wrote:


ok now i get permission denied



import os
homedir =s.path.expanduser('~')
try:
  from win32com.shell import shellcon, shell
  homedir =hell.SHGetFolderPath(0, shellcon.CSIDL_APPDATA, 0, 0)



except ImportError:
  homedir =s.path.expanduser(~)
print homedir
print os.listdir(homedir+\\backup\\)
#homedir.replace( , \\)
#print homedir
backupdir1 =s.path.join(homedir, backup)
backupdir2 =s.path.join(homedir, backup2)
shutil.copy (backupdir1, backupdir2)


You forgot to include the error traceback.

So, is homedir/backup a file, or is it a directory?  If you're trying to
copy whole directories, you might want to look at copytree instead.

If you're not sure, you could use
  os.isfile()

to check.  If that's false, then shutil.copy() can't work.  Similarly,
if the destination is a readonly file, you'd get some error.

DaveA


today's date is :  30
week chosen is :  4
C:\Users\jon
['test1.txt', 'test2.txt']

Traceback (most recent call last):
   File D:\spring 11\capstone-project\date.py, line 45, inmodule
 shutil.copy (backupdir1, backupdir2)
   File C:\Python27\lib\shutil.py, line 116, in copy
 copyfile(src, dst)
   File C:\Python27\lib\shutil.py, line 81, in copyfile
 with open(src, 'rb') as fsrc:
IOError: [Errno 13] Permission denied: 'C:\\Users\\jon\\backup'



Good job, reading the first part of my message.  Now, why are you saying 
in other messages that it can't write to your home directory?  The error 
doesn't refer to your home directory, it refers to a file 
C:\Users\jon\backup which it can't read.


But as your program demonstrates, that's a directory not a file.  It's 
fine to use shutil.copy, but then you have to give it a source file to copy.


For example, C:\Users\jon\backup\test1.txt

DaveA
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Re: multiple values for keyword argument

[Patty]

Well - this is all timely email.  I just spent the day configuring my HP mini 
netbook running Windows 7 with all the right software based on recomendations 
from folks on this list, from the Python Tutor list and an email group of 
former colleagues where I spelled out exactly all the programming languages and 
stuff I ideally wanted.  It has been very enlightening and actually not so 
difficult!  Asking pays off!  And I made a few realizations - I had some 
misperceptions about some software packages and -- I had been thinking about 
this 'self' business since yesterday.  And you and Ethan and Ben Finney from 
yesterday (the last email msg I read last night, might know) are right -- I was 
being stubborn and wanting to do things *my* way and I was telling myself that 
when it comes time to do this for a future employer, well I will just change my 
code in the appropriate places to 'self' and will start using 'self' when I 
start working for them.  And a little thought  in the back of my head ... I 
wonder if the employer would be a little annoyed by that  :) 

OK - I need my hand slapped sometimes and I see that you all are trying to 
prevent me from developing a bad habit.  A few comments below:


Steven D'Aprano steve+comp.lang.pyt...@pearwood.info wrote in message 
news:4d453127$0$29965$c3e8da3$54964...@news.astraweb.com...
 On Sat, 29 Jan 2011 10:39:49 -0800, patty wrote:
 
 I am glad you said this.  I have been avoiding understanding this
 'self', just accepting it :}  For the time being, since my programs I am
 creating are for my own use, I think I will make my own names up, that
 are descriptive to me as the programmer, it's all going to be
 interpreted anyway.  And the other email equating to C's argv, etc. -
 now I get it.
 
 
 That's a shame, because `self` is actually very simple once you 
 understand the basic principles of object-oriented programming.
 
 What names would you choose? Unless you're writing descriptors, or using 
 class methods, both of which should be considered advanced usage (highly 
 advanced for descriptors, moderately so for class methods), it's not like 
 every method needs a different descriptive first argument. In English, 
 self, this, me or instance would be good names. What else would 
 you use?

That is the thing, I can get quite creative.  I envisioned myself giving it a 
name something like 'instancecalledfrommain'  probably scrunched up to 
'instfrmmain'
Weird descriptive names like that.  I keep thinking of it as a variable, so I 
keep thinking of what it is used for underlying its name.  Back to the 
I-can-do-anything-I-want
mindset.  

I have saved the messages in this thread and other ones from the last month or 
so about 'self' so I think I will gather them together and read them more 
carefully including your very good explanations below.


 
 
 The idea of method syntax is that you start with an instance of some 
 class:
 
 mystring = hello world  # an instance of the str class
 
 In procedural languages like C or Pascal, you would call a function and 
 give the string as an argument. Python supports this programming model, 
 and uses it for built-ins like len:
 
 len(mystring)
 = returns 11
 
 

And I am more comfortable in the C and Pascal worlds as a base so I see why I 
go this direction.  



 Object oriented programming uses a different syntax. Instead of 
 
 function(instance)
 
 as above, we take the instance argument outside the brackets. For example:
 
 mystring.upper()  # instead of upper(mystring)
 = returns HELLO WORLD
 
 If there are any extra arguments needed, they go inside the brackets as 
 normal.
 
 So far, this is just a change of syntax. It's like saying The cat of my 
 brother's vs. my brother's cat -- the meaning is the same, but the 
 syntax differs. 

And I am a linguist so now you are Really talking ;)



The real advantages of object oriented programming and 
 methods come elsewhere (e.g. encapsulation and inheritance).
 
[Aside: when I was learning this, the hardest part I found was
remembering which things were functions, and which were methods. 
I kept writing (wrongly!) things like:
 
hello world.len()
upper(hello world)
 
Unfortunately there is no easy way to recognise what will be a
function like len, and which are methods like upper. That will 
come with experience.

Oh!  I do this!  I seem to use this syntax interchangably.  I really need to 
memorize this carefully.


 
 Back to function/procedural syntax versus object oriented syntax... 
 
 One difference, though, is when you write a method definition. Because 
 the method you write starts off life as an ordinary function, you need to 
 write it *as if* it were a function you call like len() above. Here's how 
 you might write a method in a class:
 
 class MyClass:
def method(self, extra):
pass
 
 When you then call the method:
 
 instance = MyClass()
 instance.method(something extra)
 
 Python automatically changes the 

Re: Understanding def foo(*args)

[rusi]

On Jan 31, 12:35 am, rantingrick rantingr...@gmail.com wrote:
  Also, can the terms method and function be used interchangeably?

 Can the terms cars and truck be used interchangeably?

Oooff! A load of meaning in that one line -- I wonder though if the OP
will understand...
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Useing the processor clock, or get time in Femptoseconds

[Garland Fulton]

Does anyone have any suggestions?
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Re: Limit on entries in dictionary data structure

[MRAB]

On 31/01/2011 02:43, Shruti Sanadhya wrote:

Hi,

I am running a script that uses dictionaries on Python 2.6.4 on Ubuntu
9.10. I notice that my script crashes with a MemoryError when my
dictionary reaches 44739243th entry. My system has 3GB RAM (32-bit). I
noticed that changing the key or value types also did not help my code.
For simplicity I tried running this:

#BEGIN:python code
import sys
f={}
lsize=0
try:
 for k in range(0,4*44739243):
 f[k]=k
 if sys.getsizeof(f)  lsize:
 lsize = sys.getsizeof(f)
 print k, lsize
except:
 print k, lsize
 raise
#END:python code

The code terminates with:
Traceback (most recent call last):
   File pydict-limit.py, line 6, in module
 f[k]=k
MemoryError

I have also tried running this on Ubuntu 9.10 with Python 2.6.6 with
3.5GB RAM(32-bit) and a 64-bit LINUX cluster machine with 62GB RAM and
Python 2.4. On both these machines it crashed at entry 44739243. The
size of the data structure grows to 1.5GB. On another 64-bit cluster
machine with 32GB RAM and Python 2.6.6 it crashed at entry 178956970. In
this case the size of the data structure grew to 6GB.

Has anybody encountered this before? Can somebody suggest any fix for
this? I am trying to read some 10GB network traces into a hash
table(hence dictionary) and need constant time lookup. Clearly
increasing the machine RAM does not work. Any suggestions would be
greatly appreciated.


sys.getsizeof(...) returns the size of an object itself, not the size
of an object plus any others which that object references.

The dict in your example code occupied 1.5GB, but that didn't include
the size of the int keys and values, only the references to them.

As for the 64-bit Linux cluster machine, did you run a 32-bit or a
64-bit build of Python? A 32-bit build can't use more than 4GB (2**32).
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Re: Useing the processor clock, or get time in Femptoseconds

[Littlefield, Tyler]

If you are on windows, you can use high-resolution timers. What you are 
trying is physically impossible though: lets say you have a processor 
that runs at 2.5 GHz. that's 2.5 billion cycles per second, give or take 
a few. So, the lowest you can go is nanoseconds. You're trying to time 
like 10x the processor's actual speed, and you're not going to get 
timing that good. so, lower your bar a bit; the highest you will get is 
nanoseconds with high-res timers. (I'm not sure what the equivalent of 
this is on *nix, or whether or not python supports it on either 
platform. I think you'll end up making a DLL call, though I could be wrong).


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Re: WxPython versus Tkinter.

[alex23]

rantingrick rantingr...@gmail.com wrote:
 To be honest, i would sacrifice all the functionality of
 wxWidgets if we could get pyGUI into the stdlib. Why? Well because
 pyGUI would be under OUR complete control.

You would need to contribute something other than bullshit and
vitriol in order to be able to use the word our in the way you do
here.

 *if* the community saw the potential that i see with pyGUI
 and wanted to seriously do some development to bring it into 3.0
 compliance i'll bet Greg *would* be interested

You can't even generate your _own_ code for this idea and yet you
somehow mystically know how other people will respond? Have you _ever_
been even _close_ to being able to do this? You seem genuinely angry
and shocked at times that we haven't embraced you as some kind of
messianic firebrand, which doesn't really say a lot for your ability
to gauge the responses  desires of others.

Maybe Greg's not a complete egotist like yourself, needing the
attention and constant fluffing you seem to demand before you'll even
begin to consider coding. Maybe pyGUI as is scratches his itch,
because rather than spending YEARS trying to offload work onto the
community he just coded up what he needed to actually get something
_done_, something other than masturbating over a library for its own
sake. Maybe he has no interest in 3.x but has no concern with
community submitted patches.

A patch - I should probably explain for your sake, rick - is a diff of
changes to a body of code allowing the project maintainer to integrate
user submitted bug fixes and feature additions. Pretty much most
project maintainers will accept them sans manifesto too.

This isn't about getting  your ego stroked. This isn't about which
language's dick is the longest because it has its own GUI. This is
about people with lives of their own making small contributions born
of necessity culminating in the further growth  evolution of a useful
piece of code.
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Re: Limit on entries in dictionary data structure

[Dan Stromberg]

On Sun, Jan 30, 2011 at 6:43 PM, Shruti Sanadhya s.sanad...@gmail.com wrote:
 Hi,
 I am running a script that uses dictionaries on Python 2.6.4 on Ubuntu 9.10.
 I notice that my script crashes with a MemoryError when my dictionary
 reaches 44739243th entry. My system has 3GB RAM (32-bit). I noticed that
 changing the key or value types also did not help my code. For simplicity I
 tried running this:
 #BEGIN:python code
 import sys
 f={}
 lsize=0
 try:
     for k in range(0,4*44739243):
         f[k]=k
         if sys.getsizeof(f)  lsize:
             lsize = sys.getsizeof(f)
             print k, lsize
 except:
     print k, lsize
     raise
 #END:python code
 The code terminates with:
 Traceback (most recent call last):
   File pydict-limit.py, line 6, in module
     f[k]=k
 MemoryError
 I have also tried running this on Ubuntu 9.10 with Python 2.6.6 with 3.5GB
 RAM(32-bit) and a 64-bit LINUX cluster machine with 62GB RAM and Python 2.4.
 On both these machines it crashed at entry 44739243. The size of the data
 structure grows to 1.5GB. On another 64-bit cluster machine with 32GB RAM
 and Python 2.6.6 it crashed at entry 178956970. In this case the size of the
 data structure grew to 6GB.
 Has anybody encountered this before? Can somebody suggest any fix for this?
 I am trying to read some 10GB network traces into a hash table(hence
 dictionary) and need constant time lookup. Clearly increasing the machine
 RAM does not work. Any suggestions would be greatly appreciated.
 Thanks,
 Shruti

If you need strict controls over how much memory is used, you might be
better off with C or something.  Or Cython would give you a Pythonic
syntax with C's datastructures (as well as Python-style
datastructures, but that gets back into memory unpredictability).  On
an Ubuntu system, you can probably man hcreate to get some info on a
hash table accessible from C.

If you need a huge dictionary, then using something like gdbm or
bsddb might be good, though I doubt these are constant time - they're
more like single-table databases, where the keys and values must all
be strings or serialized non-strings.  However, they should be fine
with huge dictionaries.  They have the advantage of providing a pretty
dictionary-like interface.  This almost certainly would not bump into
any memory limits, as they are disk-based.

If you really do need to keep things in RAM (VM), you might try this
module: http://stromberg.dnsalias.org/~strombrg/treap/ on one of your
64 bit systems, preferably with a recent cpython like 2.6 or 2.7 built
with a 64 bit compiler.  It too is not constant time, but it is
O(c*log(n)) with a small c, at the expense of a higher standard
deviation in write times compared to something like a red/black tree
(better average performance though).  This provides a very
dictionary-like interface.  It would implicitly store things sorted by
key, incidentally, though that may be unimportant in your application.
 This may or may not have the same memory issues as the dictionary -
and I'd be very interested in hearing whether they do or not.

You might also be able to read everything into a big list, then sort
it.  Then use the bisect module to do log(n) time lookups.  This does
not give a dictionary-like interface or constant time, but it doesn't
require anything outside of CPython's standard library.  It may or may
not have the same memory issues you were seeing with dictionaries.

Here's something based on your code above, that works with the
mentioned treap module.  I found that it required about 1 gig for each
10% of the numbers the code was trying to save - on a 32 bit, Ubuntu
10.10 system.  However, I have only 3 gig of RAM, so I terminated it
before it got to a memory error:

#!/usr/bin/python

import sys
import treap
f = treap.treap()
top = 4*44739243
try:
for k in xrange(0, top):
sys.stdout.write('%d %f%%\r' % (k, k * 100.0 / top))
f[k]=k
print
except:
print
raise
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Re: Useing the processor clock, or get time in Femptoseconds

[John Nagle]

On 1/30/2011 8:14 PM, Littlefield, Tyler wrote:

If you are on windows, you can use high-resolution timers. What you are
trying is physically impossible though: lets say you have a processor
that runs at 2.5 GHz. that's 2.5 billion cycles per second, give or take
a few. So, the lowest you can go is nanoseconds. You're trying to time
like 10x the processor's actual speed, and you're not going to get
timing that good. so, lower your bar a bit; the highest you will get is
nanoseconds with high-res timers. (I'm not sure what the equivalent of
this is on *nix, or whether or not python supports it on either
platform. I think you'll end up making a DLL call, though I could be
wrong).


   On x86 CPUs since the Pentium, you can read the CPU's cycle counter,
which is incrementing once for each clock cycle, maybe every 300ps
or so on a current generation CPU.
See http://en.wikipedia.org/wiki/Time_Stamp_Counter;

   You do not want to do this.  First, you're in Python, which is
interpreted; picosecond level timing resolution is orders of magnitude
finer than is meaningful at the Python source level. Second,
on multiprocessors, each CPU has its own cycle clock, and they're not
synchronized.  Third, on superscalar CPUs, reading of the clock may
occur out of order and be meaningless.

   In Python, just call time.time(), which gets you a floating point
number with about 1ms resolution.

John Nagle


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Re: Bugs/issues in tkinter.simpledialog!!

[alex23]

rantingrick rantingr...@gmail.com wrote:
 Actually i see you point but there is a good reason behind me bringing
 this up here. I want to bring to the attention of everyone how little
 interest there is for Tkinter.

Right. You have no interest in resolving this issue and instead want
to use it as more ammunition in your ongoing crusade. You even have
the gall to act _offended_ at Giampaolo's suggestion that you log the
bug, dumping your usual bullshit and vitriol on someone WHO HAS
ACTUALLY DONE THE SORT OF WORK YOU CONSTANTLY CLAIM YOU'RE GOING TO,
even though your every intention was to parade this issue around as if
it somehow validates your personal blend of crazy.

You're a class act, that's for sure.

 Agreed. However i would rather just write a patch, send it to some
 email and be done. Or just commit the changes myself.  This bug
 tracker is just bureaucracy at it's worst. You are making this process
 too hard and people are not going to get involved when they have to
 jump through 20 hoops just to patch three lines of freaking code!

Because complex distributed coding projects should be treated like
Wikipedia?

It must suck being such a genius and yet be unable to grapple with a
simple bug tracker...
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[issue10845] test_multiprocessing failure under Windows

[Georg Brandl]

Changes by Georg Brandl ge...@python.org:


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[issue11069] IDLE crashes when Stack Viewer opened

[Georg Brandl]

Georg Brandl ge...@python.org added the comment:

Thanks, applied in r88258.

--
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status: open - closed

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[issue10961] Pydoc touchups in new browser for 3.2

[Georg Brandl]

Georg Brandl ge...@python.org added the comment:

I fixed two instances of missing HTML escaping and committed as r88261.  The 
code should be checked thoroughly for more such missing escaping.

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[issue11051] system calls per import

[Nadeem Vawda]

Changes by Nadeem Vawda nadeem.va...@gmail.com:


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[issue11051] system calls per import

[Martin v . Löwis]

Martin v. Löwis mar...@v.loewis.de added the comment:

 Something has gone out of control here. Why do we need to check so many 
 alternative locations?

What change do you propose?

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[issue11051] system calls per import

[Raymond Hettinger]

Changes by Raymond Hettinger rhettin...@users.sourceforge.net:


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[issue11051] system calls per import

[Georg Brandl]

Changes by Georg Brandl ge...@python.org:


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[issue11051] system calls per import

[Antoine Pitrou]

Antoine Pitrou pit...@free.fr added the comment:

  Something has gone out of control here. Why do we need to check so many 
  alternative locations?
 
 What change do you propose?

First, I don't understand why we need to check both foo.so and
foomodule.so. Second, I don't understand why we need to check both
foo.cpython32.so and foo.so. If you fix both these, the number of
stat() calls per would-be extension module goes down from 6 to 2 per
directory path.

Then there seems to be a couple of redundant stat/fstat calls on some
files.

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[issue10680] argparse: titles and add_mutually_exclusive_group don't mix (even with workaround)

[Steven Bethard]

Steven Bethard steven.beth...@gmail.com added the comment:

Looks great, thanks. I've updated the patch so it applies okay to both 
release27-maint and py3k. All tests pass on both branches.

It's a one line fix and the test case looks good, so there should be no problem 
applying this to release27-maint.

For 3.2, the py3k branch is frozen for rc2, and Georg has said that he hopes 
for zero commits between rc2 and final. If anyone feels very strongly about 
this getting into 3.2, please ask Georg for permission.

--
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stage: unit test needed - patch review
Added file: http://bugs.python.org/file20617/issue10680_withTestcase.patch

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[issue10680] argparse: titles and add_mutually_exclusive_group don't mix (even with workaround)

[Steven Bethard]

Changes by Steven Bethard steven.beth...@gmail.com:


Removed file: http://bugs.python.org/file20548/issue10680_withTestcase.patch

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[issue10680] argparse: titles and add_mutually_exclusive_group don't mix (even with workaround)

[Steven Bethard]

Changes by Steven Bethard steven.beth...@gmail.com:


Removed file: http://bugs.python.org/file20114/argparse.diff

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[issue10680] argparse: titles and add_mutually_exclusive_group don't mix (even with workaround)

[Georg Brandl]

Georg Brandl ge...@python.org added the comment:

I haven't started yet actually releasing, so this got in as r88263.

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resolution:  - fixed

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[issue7502] All DocTestCase instances compare and hash equal to each other

[Cédric Krier]

Cédric Krier cedric.kr...@b2ck.com added the comment:

Here is a patch that defines __eq__ and __hash__ on DocTestCase.

--
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Added file: http://bugs.python.org/file20618/doctestcase_eq_hash.patch

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[issue11069] IDLE crashes when Stack Viewer opened

[Brian Curtin]

Brian Curtin cur...@acm.org added the comment:

This should be back-ported to the maintenance branch as well. I can take care 
of that if Georg is busy with release-related stuff.

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[issue10680] argparse: titles and add_mutually_exclusive_group don't mix (even with workaround)

[Steven Bethard]

Steven Bethard steven.beth...@gmail.com added the comment:

Awesome, thanks! Do you want to apply to 2.7 or should I?

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[issue11071] What's New review comments

[Nick Coghlan]

New submission from Nick Coghlan ncogh...@gmail.com:

Reviewing the What's New docs, this seemed like the easiest way to give Raymond 
a list of things I noticed:

- first sentence in the ast module section needs rewording (currently 
includes fragments from a couple of different phrasings)

- in the dis module section, dis.dis has also acquired the ability to 
disassemble source string directly, avoiding the need to compile them manually 
first (see issue 6507).

- in the dbm module section, there is another case of a sentence containing 
fragments from two different phrasings

- the new handler of last resort functionality in the logging module deserves 
a mention (see issue 10626 and the explanation at 
http://docs.python.org/dev/howto/logging.html#what-happens-if-no-configuration-is-provided)

- Vinay's rewrite of the logging module docs to be significantly more 
approachable (by splitting them into the raw logging API docs and the 
read-as-much-as-you-need-to logging HOWTO) is also a notable and welcome 
change.

--
assignee: rhettinger
components: Documentation
messages: 127529
nosy: ncoghlan, rhettinger
priority: normal
severity: normal
status: open
title: What's New review comments
versions: Python 3.2

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[issue11071] What's New review comments

[Nick Coghlan]

Nick Coghlan ncogh...@gmail.com added the comment:

A couple more in the Build and CAPI section:

- The is a new function should be There is a new function

- The PyUnicode_CompareWithASCIIString() now either needs to drop the The 
or add function before the now. 

It's fascinating to read all that and realise how much actually has been done 
since 3.1 came out.

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[issue10680] argparse: titles and add_mutually_exclusive_group don't mix (even with workaround)

[Georg Brandl]

Georg Brandl ge...@python.org added the comment:

Please do.

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[issue11069] IDLE crashes when Stack Viewer opened

[Georg Brandl]

Georg Brandl ge...@python.org added the comment:

Please do.

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[issue11023] pep 227 missing text

[Alan Isaac]

Alan Isaac alan.is...@gmail.com added the comment:

Bear with my confusion about your response.  Are you saying that CPython 
documentation bugs cannot be submitted here, or that this does not constitute a 
CPython documentation bug?  I assume the latter.  But then, can you tell me 
where to find the correct CPython documentation after I read the following 
quote from PEP 277?

http://www.python.org/dev/peps/pep-0227/
Implementation

XXX Jeremy, is this still the case?

The implementation for C Python uses flat closures [1].

In case you might care about a user confusion ...  Your reply left me puzzled 
that PEPs that have reached the standards track would not be considered part of 
the CPython documentation distribution.

Thank you,
Alan Isaac

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[issue10680] argparse: titles and add_mutually_exclusive_group don't mix (even with workaround)

[Steven Bethard]

Steven Bethard steven.beth...@gmail.com added the comment:

Done in r88268. Thanks again everyone!

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[issue11071] What's New review comments

[Nick Coghlan]

Nick Coghlan ncogh...@gmail.com added the comment:

Another significant logging change: the addition of the style parameter for 
Formatter objects (allowing the use of str.format and string.Template style 
substitution instead of percent formatting)

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[issue11071] What's New review comments

[Nick Coghlan]

Nick Coghlan ncogh...@gmail.com added the comment:

The last two logging changes potentially worth mentioning that I noticed:

- simple callables can now be supplied as logging filters (see the version 3.2 
note in http://docs.python.org/dev/library/logging#filter-objects)

- the logging API docs now include a section dedicated to the available 
attributes on LogRecord instances 
(http://docs.python.org/dev/library/logging#filter-objects). This makes it much 
easier to write Filter and Formatter objects that reference these attributes.

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[issue11071] What's New review comments

[Nick Coghlan]

Nick Coghlan ncogh...@gmail.com added the comment:

I was wrong, I found one more potentially notable logging change:
http://docs.python.org/dev/library/logging#logging.setLogRecordFactory

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[issue11071] What's New review comments

[Nick Coghlan]

Nick Coghlan ncogh...@gmail.com added the comment:

Adding Vinay, given the number of logging changes in 3.2 that don't appear to 
be in the What's New yet (the only logging change noted there at the moment is 
the inclusion of PEP 391)

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[issue11068] Python 2.7.1 Idle traceback on OS X (10.6.6)

[David Meier]

David Meier djme...@gmail.com added the comment:

Removing the 10.6 specific Python 2.7.1 installation (with the instructions 
provided by Ned) and reinstalling the 10.3-10.6 32bit installation fixed the 
aforementioned segfault.  Thanks for the information, however, I do think it 
should be noted on the download page that there are problems with the 10.6 
32/64-bit version and it is safer to go the 32-bit only installer unless there 
is a specific need.  I did not see any caveats mentioned when I went to 
download it.

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[issue9527] Add aware local time support to datetime module

[Miki Tebeka]

Changes by Miki Tebeka miki.teb...@gmail.com:


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[issue11048] import ctypes causes segfault on read-only filesystem

[Marcin Bachry]

Marcin Bachry hegel...@gmail.com added the comment:

This patch fixes issue with unitialized variable which makes ctypes crash in 
error handler.

Note that for you it merely turns Segmentation fault into MemoryError 
exception.  Python ships with buggy version of libffi, which tries to allocate 
memory using mmap() over a temporary file (the one seen in strace output above) 
instead of just doing mmap(MAP_ANONYMOUS|MAP_PRIVATE).  The bug is fixed in 
this libffi commit:

  
https://github.com/atgreen/libffi/commit/eaf444eabc4c78703c0f98ac0197b1619c1b1bef

Until Python's libffi is updated, you can do mount -t tmpfs none /dev/shm.  
It's good to have tmpfs mounted anyway, just like proc and sysfs.

--
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nosy: +marcin.bachry
Added file: http://bugs.python.org/file20619/ctypes-erofs-crash.diff

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[issue11059] Mercurial fails on code.python.org repo

[Steffen Daode Nurpmeso]

Steffen Daode Nurpmeso sdao...@googlemail.com added the comment:

'Had to look on a sunday once again, and it is still impossible to clone 
branches/release2.7-maint.
In the meanwhile the Mercurial people from http://mercurial.selenic.com 
reacted - they play the ball back to python.org.
*However*: there are a lot of Issues at 
http://mercurial.selenic.com/bts/issueXY (try 2606, 2602, 2595, my 2239 and 
possibly others).

--
status: closed - open
title: code.python.org repo failures introduced! - Mercurial fails on 
code.python.org repo
versions: +Python 2.7

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[issue10716] Modernize pydoc to use CSS

[Ron Adam]

Ron Adam ron_a...@users.sourceforge.net added the comment:

A reminder: Check for instances where html.escape is not called on data 
inserted into the html pages.

I'll update the patch as the non-css (error handling) parts made it into python 
3.2.  :-)

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[issue11059] Mercurial fails on code.python.org repo

[Steffen Daode Nurpmeso]

Steffen Daode Nurpmeso sdao...@googlemail.com added the comment:

http://mercurial.selenic.com/bts/issue2595 says code.python.org/hg often 
seems unstable., so it seems to be a well known thing.  I leave this issue now 
open nevertheless, and let some experienced Python.org user  decide what to do 
with it.  (Antoine Pitrou, you are nosy, and it seems i have completely missed 
your hint (Works fine here did not count for me) - will you close that as 
approbiate?)

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[issue11059] Mercurial fails on code.python.org repo

[Antoine Pitrou]

Antoine Pitrou pit...@free.fr added the comment:

 'Had to look on a sunday once again, and it is still impossible to
 clone branches/release2.7-maint.

It failed here on one attempt and succeeded on others. hg verify ran fine 
too, including on the server.

I'm closing the issue again; in all likelihood, this is either a transient 
network issue, or a Mercurial bug - and certainly not a bug in Python itself 
which is what this tracker is for ;)

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[issue11048] import ctypes causes segfault on read-only filesystem

[Alexander Belopolsky]

Alexander Belopolsky belopol...@users.sourceforge.net added the comment:

It would be nice to add a unit test to this patch.  I don't think messing with 
read-only filesystems is feasible in regrtest, but it seems from reading 
_ctypes_alloc_callback() source that similar behavior can be triggered by 
passing a failing converters list to a ctypes function constructor.

A nit-pick: it would be easier to verify that all CThunkObject fields are 
initialized if initialization was done in the same order as declaration:


typedef struct {
PyObject_VAR_HEAD
...
PyObject *callable;
PyObject *restype;
SETFUNC setfunc;
ffi_type *ffi_restype;
ffi_type *atypes[1];
} CThunkObject;


In other words, p-restype = NULL; should go after p-callable = NULL;.

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[issue11071] What's New review comments

[Raymond Hettinger]

Raymond Hettinger rhettin...@users.sourceforge.net added the comment:

Nick, thanks for the read-through and comments.

Later this week, will get add a section of logging.

Other people are also welcome to use this tracker item for other comments.

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[issue6715] xz compressor support

[devurandom]

Changes by devurandom devuran...@gmx.net:


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[issue7502] All DocTestCase instances compare and hash equal to each other

[Antoine Pitrou]

Changes by Antoine Pitrou pit...@free.fr:


--
stage: needs patch - patch review
versions: +Python 3.3 -Python 2.6, Python 3.1

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[issue11069] IDLE crashes when Stack Viewer opened

[Brian Curtin]

Brian Curtin cur...@acm.org added the comment:

Fixed in release31-maint in r88269.

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stage:  - committed/rejected

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[issue10990] tests mutating sys.gettrace() w/o re-instating previous state

[Brett Cannon]

Changes by Brett Cannon br...@python.org:


Removed file: http://bugs.python.org/file20581/issue10990.diff

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[issue10990] tests mutating sys.gettrace() w/o re-instating previous state

[Brett Cannon]

Brett Cannon br...@python.org added the comment:

Sorry about that. New patch attached.

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Added file: http://bugs.python.org/file20620/issue_10990.diff

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[issue9931] test_ttk_guionly hangs on XP5

[Paul Moore]

Paul Moore p.f.mo...@gmail.com added the comment:

Patch looks good to me. Can this be applied? As a temporary workaround I have 
set my buildbot to run interactively. Once the fix is applied, I will switch 
back to running as a service.

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