Re: [Tutor] create an xls file using data from a txt file

2011-05-12 Thread Peter Otten
Steve Willoughby wrote:

 On 11-May-11 15:54, Prasad, Ramit wrote:
 Core windows commands don't generally accept it, including native
 Windows applications (although sometimes they're lenient in what they
 accept).  It'll work for command-line Python script usage because it's
 *python* that allows them, not *windows*.

 They work in *Windows* command prompt natively.
 
 Respectfully, I think you aren't clear on how command line execution
 works.  Hopefully I can help a little (yes, there are enough cases where
 it'll bite you that it's good to know this).
 
 Some apps do not work well that is true, but the reason that theywork
 like this with Python is NOT because Python allows it but because
 Windows does. I highly doubt Python checks for / and converts it to
 \\ (or does any complicated checking of file strings). YMMV for apps,
 but I have never had a problem with '/' on the command prompt. It is an
 important caveat to note that this behavior is not Guaranteed.
 
 Actually, yes, that's exactly what Python (or actually the underlying
 file handling libraries it's built with) is doing on Windows.  There is
 a decades-long tradition of C compilers (et al) doing this conversion
 for the sake of all the ported Unix C programs that people wanted to run
 on Windows (or, at the time, MSDOS).
 
 If Windows natively supported it, then you could do this:
 
 C:\ DIR /users/fred/desktop
 C:\ DEL /temp/myfile
 
 Or try running your Python program like
 
 C:\ /python27/python.exe scriptname.py
 
 That doesn't work either, because Windows is NOT in any way at all
 interpreting the / characters.
 
 So why does this work:
 
 C:\ myscript.py /temp/myfile /users/fred/desktop
 
 or even
 
 C:\ \python27\python.exe myscript.py /temp/myfile
 
 That works because Windows hands ALL of the argument strings, as-is,
 with NO interpretation, to the application to deal with.  In this case,
 the application is Python, and Python is going to the extra work to
 interpret the / characters as \ characters when you try to use them in
 open() calls and the like.
 

The following suggests otherwise:


Note  File I/O functions in the Windows API convert / to \ as part of 
converting the name to an NT-style name, except when using the \\?\ prefix 
as detailed in the following sections.


(Found at http://msdn.microsoft.com/en-us/library/aa365247(VS.85).aspx )


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Re: [Tutor] create an xls file using data from a txt file

2011-05-12 Thread Tim Golden

To confirm: Python does *nothing* to convert automatically
from one form of path separator to another. Windows from
very early on, has accepted /-slashes as path separators
to API calls. Where they don't work is: at the command shell
itself presumably since slashes are commonly used to introduce
options; and, sometimes, the Windows Shell API although I can't
lay my hands on an example at the moment.

If you were to write something in C to call CreateFile and
pass a path such as c:/temp/temp.txt it would work without
a problem because the Windows API accepts those kinds of
paths.

TJG
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[Tutor] Just Joined!

2011-05-12 Thread Alex Smith
Hi All,

I just joined this list and am really new to python. I have an assignment to 
create a function with (a_string, width) which returns the a_string with all 
the lower case characters changed to upper case characters and vice versa and 
centered; was wondering if someone could point me in the right direction. I am 
not just asking for the answer but just need a few tips to get started. So far 
I do know I should use the dir(str)
and do not quite understand what the width option is used for


 help(dir)
Help on built-in function dir in module __builtin__:

dir(...)
    dir([object]) - list of strings
    
    Return an alphabetized list of names comprising (some of) the attributes
    of the given object, and of attributes reachable from it:
    
    No argument:  the names in the current scope.
    Module object:  the module attributes.
    Type or class object:  its attributes, and recursively the attributes of
        its bases.
    Otherwise:  its attributes, its class's attributes, and recursively the
        attributes of its class's base classes.


def SwapcaseAndCenter(dir,??)



Thanks for any advice!
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Re: [Tutor] Just Joined!

2011-05-12 Thread Walter Prins
On 12 May 2011 12:34, Alex Smith alexsmith24...@yahoo.com wrote:

 Hi All,

 I just joined this list and am really new to python. I have an assignment
 to create a function with (a_string, width) which returns the a_string with
 all the lower case characters changed to upper case characters and vice
 versa and centered; was wondering if someone could point me in the right
 direction. I am not just asking for the answer but just need a few tips to
 get started. So far I do know I should use the dir(str)
 and do not quite understand what the width option is used for

 I think you're missing the point about the suggestion to use dir() -- as
per the help you yourself retrieved, dir returns an alphabetized list of
names comprising (some of) the attributes of the given object, and of
attributes reachable from it...  The suggestion to do dir(str) was intended
as a way to learn about how string objects work in Python, not that it
should be used directly in the source code of your solution.

For example, dir(str) lists an interesting attribute (in this case a
method) called swapcase... now investigating this by doing
help(str.swapcase) you get:
 help(str.swapcase)
Help on method_descriptor:

swapcase(...)
S.swapcase() - string

Return a copy of the string S with uppercase characters
converted to lowercase and vice versa.

Sounds relevant to your goals. ;)

As for the width question, think about the requirement to center the
string.  Centered with reference to what?  How are you going to center
something if you don't know how wide the thing you're centering on, is?

Walter
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Re: [Tutor] Just Joined!

2011-05-12 Thread Wayne Werner
On Thu, May 12, 2011 at 6:34 AM, Alex Smith alexsmith24...@yahoo.comwrote:

 Hi All,



I just joined this list and am really new to python.


Hi! Welcome to the Python tutor list, and Python!


 I have an assignment to create a function with (a_string, width) which
 returns the a_string with all the lower case characters changed to upper
 case characters and vice versa and centered; was wondering if someone could
 point me in the right direction. I am not just asking for the answer but
 just need a few tips to get started.


That's good, because that's our policy here ;)


  So far I do know I should use the dir(str)


I think you might be a little confused as to what dir actually does, or
maybe what your assignment is really asking!


 and do not quite understand what the width option is used for


Since you said the text is supposed to be centered, I suspect it means the
final width of the string...


  help(dir)
 snip

Return an alphabetized list of names comprising (some of) the attributes
 of the given object, and of attributes reachable from it:snip


So dir gives you the attributes of an object. In this case since you're
playing with a string you want to take a look at string objects. What
happens when you run dir(str)? What happens when you run dir('this is a
string')?



 def SwapcaseAndCenter(dir,??)


The best way to understand what an assignment is asking is usually to have
an example - and if you don't have an example, make one up!

So I suspect your teacher might want something like this: (I'm replacing
spaces with 'x' so you can see them. It's a good thing to do while you're
testing)

 SwapcaseAndCenter('a', 3)
'xAx'
 SwapcaseAndCenter('hello', 10)
'xxHELLOxxx'
 SwapcaseAndCenter('WeIrD', 12)
'xxxwEiRd'

I suspect if you look carefully at the output of the `dir` commands that I
mentioned above, you will find some help.

HTH,
Wayne
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Re: [Tutor] Just Joined!

2011-05-12 Thread Alex Smith
Thank you both for the quick replies! So I understand now dir is just used to 
assist in finding relevant strings. wapcaseAndCenter('hello', 10) I don't 
understand how from your example you get an output from 
: SwapcaseAndCenter('hello', 10) I get the below error:

Traceback (most recent call last):
  File pyshell#24, line 1, in module
    SwapcaseAndCenter('hello', 10)
NameError: name 'SwapcaseAndCenter' is not defined

So i started thinking the string used is swapcase and center although I 
still get an error with that input:

 swapcase.center('hello',10)

Traceback (most recent call last):
  File pyshell#28, line 1, in module
    swapcase.center('hello',10)
TypeError: an integer is required










From: Wayne Werner waynejwer...@gmail.com
To: Alex Smith alexsmith24...@yahoo.com
Cc: tutor@python.org tutor@python.org
Sent: Thursday, 12 May 2011, 5:05
Subject: Re: [Tutor] Just Joined!


On Thu, May 12, 2011 at 6:34 AM, Alex Smith alexsmith24...@yahoo.com wrote:

Hi All, 
 
I just joined this list and am really new to python. 

Hi! Welcome to the Python tutor list, and Python!
 
I have an assignment to create a function with (a_string, width) which returns 
the a_string with all the lower case characters changed to upper case 
characters and vice versa and centered; was wondering if someone could point me 
in the right direction. I am not just asking for the answer but just need a few 
tips to get started.

That's good, because that's our policy here ;)
 
So far I do know I should use the dir(str)

I think you might be a little confused as to what dir actually does, or maybe 
what your assignment is really asking! 
 
and do not quite understand what the width option is used for

Since you said the text is supposed to be centered, I suspect it means the 
final width of the string...
 
 help(dir)
snip 
   Return an alphabetized list of names comprising (some of) the attributes
    of the given object, and of attributes reachable from it:snip

So dir gives you the attributes of an object. In this case since you're playing 
with a string you want to take a look at string objects. What happens when you 
run dir(str)? What happens when you run dir('this is a string')?
 


def SwapcaseAndCenter(dir,??)

The best way to understand what an assignment is asking is usually to have an 
example - and if you don't have an example, make one up!

So I suspect your teacher might want something like this: (I'm replacing spaces 
with 'x' so you can see them. It's a good thing to do while you're testing)

 SwapcaseAndCenter('a', 3)
'xAx'
 SwapcaseAndCenter('hello', 10)
'xxHELLOxxx'
 SwapcaseAndCenter('WeIrD', 12)
'xxxwEiRd'

I suspect if you look carefully at the output of the `dir` commands that I 
mentioned above, you will find some help.

HTH,
Wayne___
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[Tutor] cpython

2011-05-12 Thread tee chwee liong

hi all,
 
i just started python but i'm hearing there is cpython. what is it different 
from python? is there any tutorials i can refer. 
 
thanks
tcl   ___
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Re: [Tutor] cpython

2011-05-12 Thread Tim Golden

On 12/05/2011 14:10, tee chwee liong wrote:

hi all,

i just started python but i'm hearing there is cpython. what is it
different from python? is there any tutorials i can refer.


CPython is just the most common version of Python, so-called because
it's written in C: the one you download from python.org.

It's normally only called Cpython to distinguish it if needed from 
other implementations, such as Jython (Java-based), IronPython 
(.NET-based), PyPy (Python-based) and others.


TJG
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Re: [Tutor] cpython

2011-05-12 Thread Izz ad-Din Ruhulessin
Hi,

CPython is the C implementation of Python. You can read the tutorial in the
Python docs.

It is a rather advanced topic, however. If you nevertheless want to delve
into it, it might be a good idea to check out www.cython.org first.

2011/5/12 tee chwee liong tc...@hotmail.com

  hi all,

 i just started python but i'm hearing there is cpython. what is it
 different from python? is there any tutorials i can refer.

 thanks
 tcl

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Re: [Tutor] cpython

2011-05-12 Thread tee chwee liong

thanks for your advice. let me check it out. 
 


Date: Thu, 12 May 2011 15:18:40 +0200
Subject: Re: [Tutor] cpython
From: izzaddin.ruhules...@gmail.com
To: tc...@hotmail.com
CC: tutor@python.org

Hi,


CPython is the C implementation of Python. You can read the tutorial in the 
Python docs.


It is a rather advanced topic, however. If you nevertheless want to delve into 
it, it might be a good idea to check out www.cython.org first.


2011/5/12 tee chwee liong tc...@hotmail.com


hi all,
 
i just started python but i'm hearing there is cpython. what is it different 
from python? is there any tutorials i can refer. 
 
thanks
tcl

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Re: [Tutor] create an xls file using data from a txt file

2011-05-12 Thread Prasad, Ramit
Respectfully, I think you aren't clear on how command line execution 
works.  Hopefully I can help a little (yes, there are enough cases where 
it'll bite you that it's good to know this).

True

If Windows natively supported it, then you could do this:
C:\ DIR /users/fred/desktop
C:\ DEL /temp/myfile
Or try running your Python program like
C:\ /python27/python.exe scriptname.py
That doesn't work either, because Windows is NOT in any way at all 
interpreting the / characters.
 C:\ /python27/python.exe scriptname.py

Oh, really? Works for me. 
C:\/Python31/python.exe /temp/test.py
  File /temp/test.py, line 1
print 'Hello World'
  ^
SyntaxError: invalid syntax


True that does not work for dir and del because both use '/' as the argument 
passing prefix, but that does not mean that Windows cannot handle it.

Ramit



Ramit Prasad | JPMorgan Chase Investment Bank | Currencies Technology
712 Main Street | Houston, TX 77002
work phone: 713 - 216 - 5423

-Original Message-
From: Steve Willoughby [mailto:st...@alchemy.com] 
Sent: Wednesday, May 11, 2011 6:24 PM
To: Prasad, Ramit; tutor@python.org
Subject: Re: [Tutor] create an xls file using data from a txt file

On 11-May-11 15:54, Prasad, Ramit wrote:
 Core windows commands don't generally accept it, including native
 Windows applications (although sometimes they're lenient in what they
 accept).  It'll work for command-line Python script usage because it's
 *python* that allows them, not *windows*.

 They work in *Windows* command prompt natively.

 Some apps do not work well that is true, but the reason that theywork like 
 this with Python is NOT because Python allows it but because 
Windows does. I highly doubt Python checks for / and converts it to 
\\ (or does any complicated checking of file strings). YMMV for apps, 
but I have never had a problem with '/' on the command prompt. It is an 
important caveat to note that this behavior is not Guaranteed.

Actually, yes, that's exactly what Python (or actually the underlying 
file handling libraries it's built with) is doing on Windows.  There is 
a decades-long tradition of C compilers (et al) doing this conversion 
for the sake of all the ported Unix C programs that people wanted to run 
on Windows (or, at the time, MSDOS).

If Windows natively supported it, then you could do this:

C:\ DIR /users/fred/desktop
C:\ DEL /temp/myfile

Or try running your Python program like

C:\ /python27/python.exe scriptname.py

That doesn't work either, because Windows is NOT in any way at all 
interpreting the / characters.

So why does this work:

C:\ myscript.py /temp/myfile /users/fred/desktop

or even

C:\ \python27\python.exe myscript.py /temp/myfile

That works because Windows hands ALL of the argument strings, as-is, 
with NO interpretation, to the application to deal with.  In this case, 
the application is Python, and Python is going to the extra work to 
interpret the / characters as \ characters when you try to use them in 
open() calls and the like.

-- 
Steve Willoughby / st...@alchemy.com
A ship in harbor is safe, but that is not what ships are built for.
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Re: [Tutor] cpython

2011-05-12 Thread Chris Fuller
CPython refers to the main implementation, which is written in C.  There are a 
bunch of different implementations, such as IronPython for .NET or Jython for 
the Java Virtual Machine.

There's also Cython (subtle spelling difference), which you can use to combine 
C and Python code.  It isn't quite an implementation in the same sense, but 
it's close.

Most folk use CPython, and it's what we discuss on this list, unless otherwise 
specified.

http://www.python.org/getit/
http://cython.org/

Cheers

On Thursday 12 May 2011, tee chwee liong wrote:
 hi all,
 
 i just started python but i'm hearing there is cpython. what is it
 different from python? is there any tutorials i can refer.
 
 thanks
 tcl

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[Tutor] ImportError: Module use of python25.dll conflicts with this version of Python.

2011-05-12 Thread Susana Iraiis Delgado Rodriguez
Hello list!

I just started working with a dll fro geospatial data, it uses Python to
analyze data, this package is OSGeo4W; when I run the script and got the
next error:
 import mapnik
Traceback (most recent call last):
  File stdin, line 1, in module
  File C:\OSGeo4W\apps\Python25\lib\site-packages\mapnik\__init__.py, line
42,
 in module
from _mapnik import *
ImportError: Module use of python25.dll conflicts with this version of
Python.

I'm using Python 2.6
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Re: [Tutor] create an xls file using data from a txt file

2011-05-12 Thread Steve Willoughby
Maybe we're splitting hairs over semantics then.  I thought there was 
confusion about what the CLI shell was doing with file separators as 
opposed to just handing the arguments as-is to the applications (which 
is true... the CLI doesn't really process them much, it's up to the 
application.  Where in the application, though, this is dealt with is 
not where I think we disagree.  In my original response, I clarified 
that, although as a short parenthetical note:



On 12-May-11 02:25, Peter Otten wrote:

Steve Willoughby wrote:

Actually, yes, that's exactly what Python (or actually the underlying
file handling libraries it's built with) is doing on Windows.  There is


the underlying file handling libraries would be the API calls.  But 
that's not the CLI shell's doing.  Although maybe that's what you meant 
all along.


There are enough difference between the way the Windows CLI shell and 
Unix-derived command shells function in the handling of files and option 
handling that there's often confusion there which I thought was what was 
happening here too, that the OP was saying the CLI was somehow doing the 
translation.


--
Steve Willoughby / st...@alchemy.com
A ship in harbor is safe, but that is not what ships are built for.
PGP Fingerprint 4615 3CCE 0F29 AE6C 8FF4 CA01 73FE 997A 765D 696C
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Re: [Tutor] Just Joined!

2011-05-12 Thread Alan Gauld


Alex Smith alexsmith24...@yahoo.com wrote
 SwapcaseAndCenter('hello', 10) I don't understand how from 
your example you get an output 
...I get the below error:


NameError: name 'SwapcaseAndCenter' is not defined


Wayne was showing how it should work. As Python says 
the function is not defined yet.


Defining the function so that is does do what Wayne showed 
is your homework! :-)


--
Alan Gauld
Author of the Learn to Program web site
http://www.alan-g.me.uk/




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Re: [Tutor] ImportError: Module use of python25.dll conflicts with this version of Python.

2011-05-12 Thread Alan Gauld


Susana Iraiis Delgado Rodriguez susana.delgad...@utzmg.edu.mx 
wrote



   from _mapnik import *
ImportError: Module use of python25.dll conflicts with this version 
of

Python.

I'm using Python 2.6


You will need to find a Python 2.6 version of the DLL or revert
your Python version to 2.5. This is always a risk when using
third party modules. Ther may not be an updated version to
match your Python.

If there isn't a 2.6 version you might try asking the maintainer
to create a new version, it may well just involve a rebuild for
them. But if the maintainer has lost interst, ior its a more
complex issue you might be out of luck and have to revert
to 2.5.

HTH,


--
Alan Gauld
Author of the Learn to Program web site
http://www.alan-g.me.uk/


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Re: [Tutor] cpython

2011-05-12 Thread Alan Gauld


tee chwee liong tc...@hotmail.com wrote

thanks for your advice. let me check it out. 


If you mean cython I wouldn't bother. 
Since you are just starting in Python reading 
about cython is more likely to confuse you than help.


Cython is great once you really know python 
(and at least a little C) but I doubt if it will help 
you get to grips with the basics.


--
Alan Gauld
Author of the Learn to Program web site
http://www.alan-g.me.uk/


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[Tutor] What is the trick ???!

2011-05-12 Thread Karim


Hello

See below, I was surprised about finding hidden function in module sys:

karim@Requiem4Dream: python2.7
Python 2.7.1rc1 (r271rc1:86455, Nov 16 2010, 21:53:40)
[GCC 4.4.3] on linux2
Type help, copyright, credits or license for more information.
 import sys
 sys.getdefaultencoding()
'ascii'
 sys.setdefaultencoding()
Traceback (most recent call last):
  File stdin, line 1, in module
AttributeError: 'module' object has no attribute 'setdefaultencoding'

karim@Requiem4Dream:~/build/OpenProcessManager/test$ python2.7
Python 2.7.1rc1 (r271rc1:86455, Nov 16 2010, 21:53:40)
[GCC 4.4.3] on linux2
Type help, copyright, credits or license for more information.
 import sys
 sys.getdefaultencoding()
'ascii'
 sys.setdefaultencoding('utf-8')
Traceback (most recent call last):
  File stdin, line 1, in module
AttributeError: 'module' object has no attribute 'setdefaultencoding'
 reload(sys)
module 'sys' (built-in)
 sys.setdefaultencoding('utf-8')
 sys.getdefaultencoding()
'utf-8'


:-\ ???
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Re: [Tutor] What is the trick ???!

2011-05-12 Thread Karim

On 05/12/11 21:24, Karim wrote:


Hello

See below, I was surprised about finding hidden function in module sys:

karim@Requiem4Dream: python2.7
Python 2.7.1rc1 (r271rc1:86455, Nov 16 2010, 21:53:40)
[GCC 4.4.3] on linux2
Type help, copyright, credits or license for more information.
 import sys
 sys.getdefaultencoding()
'ascii'
 sys.setdefaultencoding()
Traceback (most recent call last):
  File stdin, line 1, in module
AttributeError: 'module' object has no attribute 'setdefaultencoding'

karim@Requiem4Dream:~/build/OpenProcessManager/test$ python2.7
Python 2.7.1rc1 (r271rc1:86455, Nov 16 2010, 21:53:40)
[GCC 4.4.3] on linux2
Type help, copyright, credits or license for more information.
 import sys
 sys.getdefaultencoding()
'ascii'
 sys.setdefaultencoding('utf-8')
Traceback (most recent call last):
  File stdin, line 1, in module
AttributeError: 'module' object has no attribute 'setdefaultencoding'
 reload(sys)
module 'sys' (built-in)
 sys.setdefaultencoding('utf-8')
 sys.getdefaultencoding()
'utf-8'


:-\ ???
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Ok I found the trick at 
http://docs.python.org/library/sys.html#sys.setdefaultencoding.
The function is removed dynamically at startup when reload I get the 
nominal one

(the original).

Sorry for the disturb.
Cheers
Karim
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[Tutor] Tkinter progress bar not responding when moved

2011-05-12 Thread tax botsis
I am trying to use a progress bar for my application and used the following
code by Michael Lange (
http://tkinter.unpythonic.net/wiki/ProgressMeter?action=PackagePages).
However, the progress bar stops responding when I move it. I haven't
modified class declaration and _demo but created my own modified function
[]:

class Meter(Tkinter.Frame):
def __init__(self, master, width=300, height=20, bg='white',
fillcolor='orchid1',\
 value=0.0, text=None, font=None, textcolor='black', *args,
**kw):
Tkinter.Frame.__init__(self, master, bg=bg, width=width,
height=height, *args, **kw)
self._value = value

self._canv = Tkinter.Canvas(self, bg=self['bg'],
width=self['width'], height=self['height'],\
highlightthickness=0, relief='flat',
bd=0)
self._canv.pack(fill='both', expand=1)
self._rect = self._canv.create_rectangle(0, 0, 0,
self._canv.winfo_reqheight(), fill=fillcolor,\
 width=0)
self._text = self._canv.create_text(self._canv.winfo_reqwidth()/2,
self._canv.winfo_reqheight()/2,\
text='', fill=textcolor)
if font:
self._canv.itemconfigure(self._text, font=font)

self.set(value, text)
self.bind('Configure', self._update_coords)

def _update_coords(self, event):
'''Updates the position of the text and rectangle inside the canvas
when the size of
the widget gets changed.'''
# looks like we have to call update_idletasks() twice to make sure
# to get the results we expect
self._canv.update_idletasks()
self._canv.coords(self._text, self._canv.winfo_width()/2,
self._canv.winfo_height()/2)
self._canv.coords(self._rect, 0, 0,
self._canv.winfo_width()*self._value, self._canv.winfo_height())
self._canv.update_idletasks()

def get(self):
return self._value, self._canv.itemcget(self._text, 'text')

def set(self, value=0.0, text=None):
#make the value failsafe:
if value  0.0:
value = 0.0
elif value  1.0:
value = 1.0
self._value = value
if text == None:
#if no text is specified use the default percentage string:
text = str(int(round(100 * value))) + ' %'
self._canv.coords(self._rect, 0, 0, self._canv.winfo_width()*value,
self._canv.winfo_height())
self._canv.itemconfigure(self._text, text=text)
self._canv.update_idletasks()


def _demo(meter, value):
meter.set(value)
if value  1.0:
value = value + 0.005
meter.after(50, lambda: _demo(meter, value))
else:
meter.set(value, 'TM completed - Please close this window')

# this is where progress bar is loaded and where I have added my own stuff
def test():
if __name__ == '__main__':
root2 = Tkinter.Tk(className=' Text Mining Progress')
m = Meter(root2, relief='ridge', bd=3)
m.pack(fill='x')
i=0.0
for fileid in reader.fileids():
m.set(i, 'Processing will take a few minutes...')
i=i+1.000/len(reader.fileids()) # here I increment the colored
bar in each iteration
m.after(1000, lambda: _demo(m, i))
print str(fileid)[:-4],document_features(reader.raw(fileid))# I
call some other processes here
root2.withdraw()


Thanks
Tax
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[Tutor] Automatic updates for a program?

2011-05-12 Thread Lan Rogers
So I have a program I want to release, but it's still in early stages
without some of its planned functionality. I want to distribute
automatic updates. I'm working under the assumption that the easiest
way to do this is to just replace the old files with the new ones. My
questions is this: How do I replace a script that is running, with a
new version?
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