>>> import inspect
>>> class Foo:
...  def __init__(self, bar):
...   pass
... 
>>> inspect.signature(Foo)
<Signature (bar)>
>>> class T(typing.Generic[typing.TypeVar("T2")]):
...  pass
... 
>>> class Foo(T[str]):
...  def __init__(self, bar):
...   pass
... 
>>> inspect.signature(Foo)
<Signature (*args, **kwds)>