TypeError: 'class' object is not callable

An SSCCE could look like

umm.py:

class UMM(object):
    def login(self):
        print("login()")

    def read_information(self):
        print("read_info() 1")
        UMM.login()
        print("read_info() 2")

main script:

import umm
umm = umm.UMM()
umm.read_information()

I didn't test it, but I imagine that this would yield exactly the following exception

TypeError: unbound method login() must be called with UMM instance as first argument (got nothing instead)

The reason is that UMM.login() is a method which expects to be called via an instance of the object.

Inside read_information(), you have self as a concrete object instance. So you could replace the call

UMM.login()

with

self.login()

in order to fulfill all dependencies.

A call to UMM.login() would try to call login() without a object instance to work on. This would work with a @staticmethod or a @classmethod, but not with a regular bound method.

This is how I do it:

# Module Code
class MyClass(object):
    def foo(self):
        print "Foo"


# Client Code
from MyClass import MyClass
inst = MyClass()
inst.foo()