Here is my test program:
''' generic test '''
import functools
import inspect
def f():
'''I am f'''
pass
g = functools.partial(f)
g.__doc__ = '''I am g'''
g.__name__ = 'g'
def partial(func, *args, **keywords):
def newfunc(*fargs, **fkeywords):
newkeywords = keywords.copy()
newkeywords.update(fkeywords)
return func(*(args + fargs), **newkeywords)
newfunc.func = func
newfunc.args = args
newfunc.keywords = keywords
return newfunc
h = partial(f)
functools.update_wrapper(h, f)
h.__doc__ = '''I am h'''
h.__name__ = 'h'
print(type(g), g.__name__, inspect.getdoc(g))
print(type(h), h.__name__, inspect.getdoc(h))
help(g)
help(h)
The output is what I expect:
(devenv-3.5.1) dilbert@gtrojan> python x.py
<class 'functools.partial'> g I am g
<class 'function'> h I am h
However the help screens for h and g are different. help(h) is again what I
expect:
Help on function h in module __main__:
h()
I am h
But help(g) is (almost) identical to help(functools.partial), the doc
string disappears:
Help on partial object:
g = class partial(builtins.object)
| partial(func, *args, **keywords) - new function with partial application
| of the given arguments and keywords.
...
The module functools has partial() defined as above, then overrides the
definition by importing partial from _functools. That would explain the
above behaviour. My question is why?
George
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