Search for a string in binary files

[hokieghal99]

François Pinard wrote:
> import glob
> for name in glob.glob('*.xls'):
>     if file(name, 'rb').read().find('Microsoft Excel') >= 0:
>         print "Found in", name
> 

Thanks for the example guys. One last question: does grep actually open 
files when it searches them? And, would it be more efficent (faster) to 
just call grep from python to do the searching?