fastest way to test file for string?

Steven D'Aprano steve at
Fri Jun 5 22:19:45 EDT 2009

On Fri, 05 Jun 2009 17:37:25 +0200, Hendrik van Rooyen wrote:

> "kj" < at> wrote:
>> Hi.  I need to implement, within a Python script, the same
>> functionality as that of Unix's
>>    grep -rl some_string some_directory
>> I.e. find all the files under some_directory that contain the string
>> "some_string".
>> I imagine that I can always resort to the shell for this, but is there
>> an efficient way of doing it within Python?
>> (BTW, portability is not high on my list here; this will run on a Unix
>> system, and non-portable Unix-specific solutions are fine with me.)
> Use grep. You will not beat it's performance.

What makes you think that performance of the find itself is the only, or 
even the main, consideration?


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