Re: calling command line programs?

2005-09-11 Thread chriss 
Grant Edwards wrote:

 On 2005-09-10, chriss [EMAIL PROTECTED] wrote:
 
 Take a look at os.popen, os.spawn, or the popen2, and
 subprocess modules.
 
 That last one seems to be gaining popularity.

 The suggested modules and functions have been deprecated according to the
 python 2.4 docs. The doc suggests to use the functions in the
 'subprocess' module.
 
 The subprocess module is depricated?
 
no, the subrocess module intends to replace modules and functions such as:
os.system
os.spawn*
os.popen*
popen2.*
commands.*

have a look at http://python.org/doc/2.4.1/lib/module-subprocess.html


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class 'Exception', unable to use 'super' to call superclass initializer

2005-09-10 Thread chriss 
Hi,

environment: Python 2.4, GNU/Linux, kernel 2.6.12.2

having subclassed 'Exception' I'm trying to call the initialiser
__init__(...) of the superclass Exception with 'super(..).__init__(..)' .
However, trying to do so results in a
'TypeError: super() argument 1 must be type, not classobj'.

Now, if I use 'Exception.__init__(..)' instad of super(..)... ,everything
works just as one would expect.

Why does 'super(..).__init__(..)' fail?


thank you for any suggestions
chriss



Here is some example code to illustrate the point:


class WorkingException(Exception):

def __init__(self, message):
# works as I would expect
Exception.__init__(self, message)


class BrokenException(Exception):

def __init__(self, message):
# fails with a typeError
super(BrokenException, self).__init__(self, message)


# - case 1 -
try:
raise WorkingException(Hello WorkingException)

except WorkingException, e:
print e


# - case 3 -
 
try:
raise BrokenException(Hello BrokenException)


except BrokenException, e:
print e



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Re: calling command line programs?

2005-09-10 Thread chriss 
Grant Edwards wrote:

 On 2005-09-11, Yevgeniy (Eugene) Medynskiy [EMAIL PROTECTED] wrote:
 
 This is probably a very newbie question, but after searching
 google and docs @ python.org I can't find an answer, so maybe
 someone would be able to help?

 I'd like to call command-line functions from my python script
 (like you would in perl using backticks)... Is there a way of
 doing this? And if so, how does the environment get treated (I
 have some variables in my env that the programs I'd be calling
 need to see).
 
 Take a look at os.popen, os.spawn, or the popen2, and
 subprocess modules.
 
 That last one seems to be gaining popularity.
 

The suggested modules and functions have been deprecated according to the
python 2.4 docs. The doc suggests to use the functions in the 'subprocess'
module.

chriss
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Re: class 'Exception', unable to use 'super' to call superclass initializer

2005-09-10 Thread chriss 
Peter Hansen wrote:

 chriss wrote:
 Hi,
 
 environment: Python 2.4, GNU/Linux, kernel 2.6.12.2
 
 having subclassed 'Exception' I'm trying to call the initialiser
 __init__(...) of the superclass Exception with 'super(..).__init__(..)' .
 However, trying to do so results in a
 'TypeError: super() argument 1 must be type, not classobj'.
 
 Now, if I use 'Exception.__init__(..)' instad of super(..)... ,everything
 works just as one would expect.
 
 Why does 'super(..).__init__(..)' fail?
 
 Exceptions do not inherit from 'object'; they are old-style classes.
 
 super() can be used only with new-style classes (which subclass 'object').
 
 -Peter

That explains it all right. 
Thank you very much for your answer.

chriss
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