Re: [Tutor] creating a regularly placed fields in a line

[Wayne Werner]

On Wed, 25 Apr 2012, Prasad, Ramit wrote:

 Useful to
know both though, since lots of people swear by % substitution.


And % formatting is slightly faster - if you end out doing tons of 
formatting and you find your script isn't fast enough, it's worth taking a 
look there.


-Wayne
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[Tutor] Python equivalent of "kill -0 PID"

[Sean Carolan]

In bash you can do this to see if a process is running:

[scarolan@kurobox:~/bin]$ kill -0 24275
[scarolan@kurobox:~/bin]$ echo $?
0

Is there a python equivalent?  I tried using os.kill() but did not see
any way to capture the output.
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Re: [Tutor] Python equivalent of "kill -0 PID"

[Joel Goldstick]

On Thu, Apr 26, 2012 at 3:24 PM, Sean Carolan  wrote:
> In bash you can do this to see if a process is running:
>
> [scarolan@kurobox:~/bin]$ kill -0 24275
> [scarolan@kurobox:~/bin]$ echo $?
> 0
>
> Is there a python equivalent?  I tried using os.kill() but did not see
> any way to capture the output.
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I don't know the answer to your question, but I googled this article:

http://www.ibm.com/developerworks/aix/library/au-python/

It talks about various sys admin things you can do with python.  It
might get you started

-- 
Joel Goldstick
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Re: [Tutor] Python equivalent of "kill -0 PID"

[Martin Walsh]

On 04/26/2012 02:24 PM, Sean Carolan wrote:
> In bash you can do this to see if a process is running:
> 
> [scarolan@kurobox:~/bin]$ kill -0 24275
> [scarolan@kurobox:~/bin]$ echo $?
> 0
> 
> Is there a python equivalent?  I tried using os.kill() but did not see
> any way to capture the output.

You might start with something like this ...

# python2.x
try:
os.kill(24275, 0)
except OSError, e:
if e.errno != 3: # 3 = No such process
raise
# process is not running, do something
else:
# process is running, do something

It would seem os.kill returns nothing if the signal is sent
successfully, and will raise an exception if not.

HTH!
Marty
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[Tutor] tkinter question

[Khalid Al-Ghamdi]

hi everyone,

I'm usting python 3.2 on windows, and I'm doing these GUI exercises using
tkinter.

I've created this simple window with two widgets (a label and a button) the
button is supposed to  exit the root window, but the problem is it doesn't
seem to, for some reason. It looks like it is "trying to", but the window
persists for some reason and becomes unresponsive. I'm NOT doing this in
IDLE as i know there are issues with this. so is it an issue the Windows?
or What?


   1. import tkinter
   2. top=tkinter.Tk()
   3.
   4. salam = tkinter.Label(top,text='salam')
   5. salam.pack()
   6.
   7. quit= tkinter.Button(top, text='quit', command=top.quit,bg='red',fg=
   'white')
   8. *
   *
   9. quit.pack(fill=tkinter.X)
   10.
   11. tkinter.mainloop()
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[Tutor] PIL and converting an image to and from a string value

[Chris Hare]

Here is what I am trying to:

the application user chooses an image file.  I want to store the image data in 
a field in a sqlite database.  My understanding from the reading I have done is 
that I have to convert the image data into a string , which I can then store in 
the database.  Additionally, I need to be able to take the stored image data 
and convert it back to an image  so I can display it in a canvas widget.  I am 
using the python imaging library

I think I have the following parts correct:

image = Image.open("cover.jpg")
image = image.resize((150,150),Image.ANTIALIAS)
png = image.tostring("PNG")

I am taking the image data from the file, resizing the image, and then using 
the PNG coder to force it into a PNG format image and converting it to a string.

I am stuck however, in figuring out how to take the string data and converting 
it back to an image that I can put into the canvas widget.  Either I am not 
finding a good explanation of how to do this or I am just not understanding 
what I am finding:-)

Any ideas are appreciated!

Thanks,
Chris

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[Tutor] virtualenv

[Ivor Surveyor]

I recently asked the question how can I get graphic.py to work on my 
edition of Python which is 2.7.2

The problem was identified by Python tutor from my error messages as:


"What that error is telling you is that you have a version 
8.5.9 oftcl, but whatever you're trying to run is expecting _only_ 8.5.2


Sadly, probably, the way to "fix" this is by relaxing the 
requirements of the thing you're trying to run. Alternatively, look 
at  virtualenv to set up an environment your  code will work with."


My next question is where do I obtain an appropriate version of virtualenv?

My operating system is

OS Name Microsoft Windows 7 Professional
Version 6.1.7600 Build 7600 .

I would appreciate any help, kind regards


Ivor Surveyor
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