class a:
	call = lambda x,y: x + y
	def hey(self):
		a().call(2,4)
a().hey()

Traceback (most recent call last):
  File "hs.py", line 10, in <module>
    a().hey()
  File "hs.py", line 9, in hey
    a().call(2,4)
TypeError: <lambda>() takes exactly 2 arguments (3 given)