John Nagle wrote:
'_sre.SRE_Pattern' is what "re.compile" returns.
Is that a mutable object, with state that changes
during the parse, or is it an immutable constant? Can
two threads use the same '_sre.SRE_Pattern' at the same time?
(I'm writing something to find race conditions in existing code,
which is why all these obscure introspection-related questions.)
A compiled pattern instance is immutable and threadsafe.
BTW, its methods don't release the GIL, so even if it wasn't threadsafe,
it would still be safe. :-)
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