[Python-Dev] Cost-Free Slice into FromString constructors--Long (original) (raw)
Runar Petursson runar at runar.net
Thu May 25 17:01:36 CEST 2006
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We've been talking this week about ideas for speeding up the parsing of Longs coming out of files or network. The use case is having a large string with embeded Long's and parsing them to real longs. One approach would be to use a simple slice: long(mystring[x:y])
an expensive operation in a tight loop. The proposed solution is to add further keyword arguments to Long (such as):
long(mystring, base=10, start=x, end=y)
The start/end would allow for negative indexes, as slices do, but otherwise simply limit the scope of the parsing. There are other solutions, using buffer-like objects and such, but this seems like a simple win for anyone parsing a lot of text. I implemented it in a branch runar-longslice-branch, but it would need to be updated with Tim's latest improvements to long. Then you may ask, why not do it for everything else parsing from string--to which I say it should. Thoughts?
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