pipes like perl

[max(01)*]

max(01)* wrote:
> infidel wrote:
> 
>> Here's one technique I use to run an external command in a particular
>> module:
>>
>>         stdin, stdout, stderr = os.popen3(cmd)
>>         stdin.close()
>>         results = stdout.readlines()
>>         stdout.close()
>>         errors = stderr.readlines()
>>         stderr.close()
>>         if errors:
>>             raise Exception(''.join(errors))
>>
>> Maybe this will get you going in a better direction?
>>
> 
> yeah thanks!
> 
> i translated as:
> 
> .....
> import os
> .....
> CMD_STDIN, CMD_STDOUT, CMD_STDERR = \
>   os.popen3("*some_system_command*", "r")
> if not CMD_STDERR.readlines():
>   ...
>   *do_something*
>   ...
>   for answer in CMD_STDOUT:
>     print answer,
>   ...
>   *do_something_more*
>   ...
> else:
>   ...
>   *do_something_else*
>   ...
> CMD_STDIN.close()
> CMD_STDOUT.close()
> CMD_STDERR.close()
> .....

but... i see it doesn't work for some commands, like "man python" (it 
gets stuck on the "if" line)...

how come?