Bruno Desthuilliers a écrit :
Henning_Thornblad a écrit :
What can be the cause of the large difference between re.search and
grep?
This script takes about 5 min to run on my computer:
#!/usr/bin/env python
import re
row=""
for a in range(156000):
row+="a"
print re.search('[^ "=]*/',row)
While doing a simple grep:
grep '[^ "=]*/' input (input contains 156.000 a in
one row)
doesn't even take a second.
Is this a bug in python?
Please re-read carefully your python code. Don't you think there's a
subtle difference between reading a file and buildin 156000 string
objects ?
Mmm... This set aside, after testing it (building the string in a
somewhat more efficient way), the call to re.search effectively takes
ages to return. Please forget my previous post.
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