[issue20710] Make pydoc consistent about bound methods

[Larry Hastings]

Larry Hastings added the comment:

A slight tweak to the patch.  Previously I was just using truth testing on the value I got from "__self__", but that's wrong if the object is considered false (e.g. ''.zfill).  (Yury got this right in #20711, and I copied from him!)

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Added file: http://bugs.python.org/file34166/larry.fix.help.on.bound.methods.4.diff

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