$ python attr_origins.py stdio_mgr StdioManager
__abstractmethods__ :: frozenset()
__add__ :: <slot wrapper '__add__' of 'tuple' objects>
__class__ :: <class 'abc.ABCMeta'>
__contains__ :: <slot wrapper '__contains__' of 'tuple' objects>
__delattr__ :: <slot wrapper '__delattr__' of 'object' objects>
__dir__ :: <method '__dir__' of 'object' objects>
__enter__ :: <function StdioManager.__enter__>
__eq__ :: <slot wrapper '__eq__' of 'tuple' objects>
__exit__ :: <function StdioManager.__exit__>
__format__ :: <method '__format__' of 'object' objects>
__ge__ :: <slot wrapper '__ge__' of 'tuple' objects>
__getattribute__ :: <slot wrapper '__getattribute__' of 'tuple' objects>
__getitem__ :: <slot wrapper '__getitem__' of 'tuple' objects>
__getnewargs__ :: <method '__getnewargs__' of 'tuple' objects>
__gt__ :: <slot wrapper '__gt__' of 'tuple' objects>
__hash__ :: <slot wrapper '__hash__' of 'tuple' objects>
__init__ :: <slot wrapper '__init__' of 'object' objects>
__init_subclass__ :: <built-in method __init_subclass__ of ABCMeta object>
__iter__ :: <slot wrapper '__iter__' of 'tuple' objects>
__le__ :: <slot wrapper '__le__' of 'tuple' objects>
__len__ :: <slot wrapper '__len__' of 'tuple' objects>
__lt__ :: <slot wrapper '__lt__' of 'tuple' objects>
__module__ :: 'stdio_mgr.stdio_mgr'
__mul__ :: <slot wrapper '__mul__' of 'tuple' objects>
__ne__ :: <slot wrapper '__ne__' of 'tuple' objects>
__new__ :: <function StdioManager.__new__>
__reduce__ :: <method '__reduce__' of 'object' objects>
__reduce_ex__ :: <method '__reduce_ex__' of 'object' objects>
__repr__ :: <slot wrapper '__repr__' of 'tuple' objects>
__rmul__ :: <slot wrapper '__rmul__' of 'tuple' objects>
__setattr__ :: <slot wrapper '__setattr__' of 'object' objects>
__sizeof__ :: <method '__sizeof__' of 'object' objects>
__slots__ :: ()
__str__ :: <slot wrapper '__str__' of 'object' objects>
__subclasshook__ :: <bound method AbstractContextManager.__subclasshook__ of <class 'stdio_mgr.stdio_mgr.StdioManager'>>
__weakref__ :: <attribute '__weakref__' of 'AbstractContextManager' objects>
_abc_impl :: <_abc_data object>
count :: <method 'count' of 'tuple' objects>
index :: <method 'index' of 'tuple' objects>
stderr :: <property object of 'StdioManager' object>
stdin :: <property object of 'StdioManager' object>
stdout :: <property object of 'StdioManager' object>