[pypy-issue] [issue1177] The empty string is a new object every time
Amaury Forgeot d Arc
tracker at bugs.pypy.org
Thu Jun 14 10:47:34 CEST 2012
Amaury Forgeot d Arc <amauryfa at gmail.com> added the comment:
This is not always true, even with CPython:
>>> x = u'\xe9'.encode('ascii', 'ignore')
>>> x == '', x is ''
The shared empty string is really an implementation detail, and not all functions use it.
(In this case, I found a function whose C implementation calls _PyString_Resize(&s, 0))
Now, PyPy could share the empty string for performance reasons.
We should make sure first that the *RPython* empty string is shared, otherwise gc
pressure would be similar.
Benchmarks, always benchmarks...
status: unread -> chatting
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