[issue20293] pydoc fails with the "unspecified" default value

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

Seems this is related issue:

>>> import zlib, inspect
>>> zlib.compressobj.__text_signature__
'(level=Z_DEFAULT_COMPRESSION, method=DEFLATED, wbits=MAX_WBITS, memLevel=DEF_MEM_LEVEL, strategy=Z_DEFAULT_STRATEGY, zdict=None)'
>>> str(inspect.signature(zlib.compressobj))
'(level=-1, method=8, wbits=15, memLevel=8, strategy=0, zdict=None)'

help(zlib.compress) shows the '(bytes, level=-1)' signature.

inspect.signature() evaluates default values and instead of expected named constant it outputs numeric value which is often implementation detail.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue20293>
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