Python handles text a code optimization process

First, it's written.

Filter (lambda : True if keyword in. decode (' UTF8 ') else False, alls)

Run cost S, too slow
Change to see

Filter (lambda : True if keyword in. decode (' UTF8 ') Else False, Alls.read (). Split (' \ n '))

Not very good, is the list traversal too slow to change to a tuple

Filter (lambda : True if keyword in. decode (' UTF8 ') Else False, (. Strip () as in alls))

Still, it's not improving.
At this time saw Decode, is it the speed of the drag down? Do not think, because the system function call is not too slow it, change to see it

Filter (lambda : True if keyword in else False, Alls.read (). Decode (' UTF8 '). Split (' \ n '))

Fast, 8 S is over, and sure enough. The call function has a great effect on speed.

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Python handles text a code optimization process