Tim Rowe wrote:
.... But even without going to a full database solution it might
be possible to make use of the flat file structure. For example, does
the "LF01" have to appear at a specific position in the input line? If
so, there's no need to search for it in the complete line. *If* there
is any such structure then a compiled regexp search is likely to be
faster than just 'if "LF01" in line', and (provided it's properly
designed) provides a bit of extra insurance against false positives.
Clearly this is someone who regularly uses grep or perl. If you
know the structure, like the position in a line, something like
the following should be fast:
with open(somename) as source:
for n, line in enumerate(source):
if n % 5 == 3 and line[5 : 9] == 'LF01':
print ('Found on line %s: %s' % (1 + n, line.rstrip())
Be careful with your assertion that a regex is faster, it is certainly
not always true. Measure speed, don't take mantras as gospel.
--Scott David Daniels
scott.dani...@acm.org
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