Rob Wolfe wrote:
> Hari Sekhon wrote:
>
>>I am writing a wrapper to a binary command to run it and then do
>>something with the xml output from it.
>>
>>What is the best way of making sure that the command is installed on the
>>system before I try to execute it, like the python equivalent of the
>>unix command "which"?
>>
>>Otherwise I'd have to do something like:
>>
>>if os.system('which somecommand') != 0:
>> print "you don't have %s installed" % somecommand
>> sys.exit(1)
>>
>>I know that isn't portable which is why a python solution would be
>>better (although this will run on unix anyway, but it'd be nice if it
>>ran on windows too).
>
>
> IMHO this is pretty portable:
>
>
>>>>def is_on_path(fname):
>
> .... for p in os.environ['PATH'].split(os.pathsep):
> .... if os.path.isfile(os.path.join(p, fname)):
> .... return True
> .... return False
>
Except that the fname will then have to be a ".exe" on Windows and not
on Unix.
regards
Steve
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