[issue2786] Names in traceback should have class names, if they're methods

[Daniil Bondarev]

Daniil Bondarev added the comment:

Made a straightforward patch for this. Probably not that pretty, so suggestions are welcome.

Note that some function names will become pretty long in exceptions:

>>> class A:
...     def __init__(self):
...         def f():
...             pass
...         f(1,2,3)
...
>>> A()
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "<stdin>", line 5, in __init__
TypeError: A.__init__.<locals>.f() takes 0 positional arguments but 3 were given

Passing UTs from lastest snapshot.

----------
keywords: +patch
nosy: +xonatius
Added file: http://bugs.python.org/file37994/full_names.patch

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<http://bugs.python.org/issue2786>
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