Re: [Tutor] for vs while

2007-09-28 Thread Joshua Simpson 
On 9/28/07, James <[EMAIL PROTECTED]> wrote:
>
>
> # doesn't work
> for i in len( stuff ):
> os.system( stuff[ i ] )
> j = i + 1
> print stuff[ j ]
>
>
> Traceback (most recent call last):
>File "", line 1, in 
> TypeError: 'int' object is not iterable
>
> What precisely causes this error?  I come from a C background, and
> while and for loops can be molded to do precisely the same thing; it
> doesn't seem like this is the case in this scenario.


You don't want to iterate through the length of the object (stuff), you want
to iterate through the object itself.

for i, j in stuff:
 os.system(i)
print j

and stuff would look like:

stuff = [("cat /etc/passwd", "viewed /etc/passwd")]

insert the pairs in tuples, rather than a list.

cheers
Josh
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Re: [Tutor] for vs while

2007-09-28 Thread Joshua Simpson 
On 9/28/07, Kent Johnson <[EMAIL PROTECTED]> wrote:
>
>
> It's worth your time learning about Python data structures and for
> loops. They are very powerful and useful and unlike anything built-in to
> C. With a background in C you should find the official tutorial pretty
> easy to read:
> http://docs.python.org/tut/tut.html


I found Dive Into Python (http://www.diveintopython.org) helpful as well
coming from a primarily C background.

cheers

Josh
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Re: [Tutor] Check if root

2007-09-29 Thread Joshua Simpson 
On 9/28/07, Robert Jackson <[EMAIL PROTECTED]> wrote:
>
> I'm trying to write a function that checks to see if the user that
> is running the python script is 'root' (I'm obviously running this
> Python program on Linux).


Why not just use os.geteuid() ?

import os

if os.geteuid() != 0:
  print "You must be root to run this script."
  sys.exit(1)
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Re: [Tutor] Bound To Be A Typo

2007-12-17 Thread Joshua Simpson 
On Dec 17, 2007 12:16 PM, earlylight publishing <
[EMAIL PROTECTED]> wrote:

>
> class Critter(object):
> """A virtual pet"""
> def ___init___(self, name):
> print "A new critter has been born!"
>
>

You're using 3 underscores before and after 'init'.  The constructor for
Python classes is '__init__' not '___init___'


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-
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Re: [Tutor] Handling MySQLdb exceptions

2007-12-19 Thread Joshua Simpson 
On Dec 19, 2007 10:14 AM, Paul Schewietzek <[EMAIL PROTECTED]> wrote:

>
> Is there any way to handle this exception? As you can see, I already
> tried it with _mysql_exceptions.OperationalError (the lines that are
> commented out), but _mysql_exceptions is not defined to Python
>
>
"OperationalError" is contained in the MySQLdb module and thus namespace, so
you'll have to reference it like so:

except MySQLdb.OperationalError:


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Re: [Tutor] Getting the type of a variable

2006-10-27 Thread Joshua Simpson 

 

On 10/27/06, Etrade Griffiths
<[EMAIL PROTECTED]>
wrote: 


Hi

I want to check the type of a variable so that I know which format to
use

for printing egAlternatively, you could just cast it as a string.  
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