[issue28727] Implement comparison (x==y and x!=y) for _sre.SRE_Pattern
STINNER Victor
report at bugs.python.org
Fri Nov 18 04:15:16 EST 2016
STINNER Victor added the comment:
Serhiy: "There is a problem with locale-depending flags. The same pattern may be compiled with the LOCALE flag to different pattern objects in different locales."
Oh, I didn't know and you are right.
"Perhaps we should compare the compiled code instead of pattern strings. Or both."
PatternObject contains many fields. I used the following two fields which come from re.compile():
* pattern
* flags
I considered that they were enough because pattern_repr() only displays these ones. Other fields:
* groups
* groupindex
* indexgroup
* weakreflist
* isbytes
* codesize, code
weakreflist can be skipped, isbytes is already tested in my patch.
Would it be possible to only compare code instead of pattern? What are groups, groupindex and indexgroup: should we also compare them?
Maybe I can start from pattern_compare-4.patch and only add a test comparing code?
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<http://bugs.python.org/issue28727>
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