"inspect.getargspec(func) 
Get the names and default values of a function’s arguments. "
"inspect.getfullargspec(func) 
Get the names and default values of a function’s arguments."

'Function' must be a Python function (or a bound method wrapper
thereof). (Some posted this 'discovery' on python-list today, so it is
not obvious to everyone.)

Suggestion: insert 'Python' before "function's"
or rewrite as
"Get the names and default values of the arguments of a Python function
or bound method."

This is a different request from #1748064, which requested that the
limitation be removed.