method_invocation.py

class Printer(object):
    def __call__(*args):
        print 'call', args
    def __get__(*args):
        print 'get', args
        return args[0]

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

"""
Prints:
(<__main__.Bar object at 0x10f3f6b10>,)
get (<__main__.Printer object at 0x10f3f6ad0>, <__main__.Bar object at 0x10f3f6b10>, <class '__main__.Bar'>)
call (<__main__.Printer object at 0x10f3f6ad0>,)
(<__main__.Bar object at 0x10f3f6b90>,)
"""