[Python-Dev] Use for enumerate()
Raymond Hettinger
python@rcn.com
2002年4月27日 12:52:08 -0400
> > > Challenge 3: do it faster and with less code.
> it should work even if the file is too large
> to fit in memory (as long as each individual line fits in memory).
def getline(filename, lineno): # Second attempt
if lineno < 1:
return ''
f = open(filename)
reduce(lambda x,y: f.readline(), xrange(lineno-1), None)
return (f.readline(), f.close())[0]
Arghh, must resist lambda.
Must not use reduce.
Must avoid tuple tricks.
...
GvR's code is too powerful
I can't resist
Raymond Hettinger