"sf" <[EMAIL PROTECTED]> wrote:
> I have files A, and B each containing say 100,000 lines (each line=one
> string without any space)
>
> I want to do
>
> " A - (A intersection B) "
>
> Essentially, want to do efficient grep, i..e from A remove those lines which
> are also present in file B.
that's an unusual definition of "grep", but the following seems to
do what you want:
afile = "a.txt"
bfile = "b.txt"
bdict = dict.fromkeys(open(bfile).readlines())
for line in open(afile):
if line not in bdict:
print line,
</F>
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