Query regarding grep!!

[johnzenger at gmail.com]

You could also use itertools:

import itertools
import re

find = re.compile("pattern")
for line in itertools.ifilter(lambda x: find.search(x),
file(filepath)):
    print line

Fredrik Lundh wrote:
> bhavya sg wrote:
>
> >  I saw in PEP4 of python 2.5 that grep module has gone
> > obsolete in perl 2.5. But I am not able to find an
> > alternative for that.
>
> the grep module has been deprecated for ages (it's been in the lib-old
> non-standard library since at least Python 2.1).  The old grep module
> depends on the regex module, which has been deprecated since Python 1.6,
> and which was finally removed in Python 2.5.
>
>  > My doubt is "are the other forms of grep like egrep and ggrep be used
>  > instead"?
>
> there are no such modules in Python, afaik.
>
> (and that's a question, not a doubt, right?)
>
> if you have Python code that uses the grep module, you can replace it
> with something like:
>
>      import re
>
>      def simple_grep(filename, pattern):
>          find = re.compile(pattern).search
>          for index, line in open(filename):
>              if find(line):
>                  print filename, index, line[:-1]
>
> where pattern is an RE-style pattern, not a REGEX-style pattern (see the
> RE documentation for details).
> 
> </F>