method_invocation.py

# Python method invocation is a strange beast
# Note difference between assigning a callable object that isn't a function
# and a callable object that is one

class Printer:
    def __call__(*args):
        print(args)

def print_stuff(*args):
    print(args)

class Bar:
    def print1(*args):
        print(args)
    print2 = Printer()
    print3 = print_stuff

Bar().print1()
Bar().print2()
Bar().print3()

"""
Prints:
    (<__main__.Bar instance at 0x7f109c35ecf8>,)
    (<__main__.Printer instance at 0x7f109c35ecb0>,)

    (<__main__.Bar instance at 0x7f0b32bd7dd0>,)
"""