Python Object Errors

Overview

A collection of common errors experienced when working with Python objects.

Example Class

class Foo:
    def Bar(self):
        return 'Baz'

TypeError: unbound method Bar()

Incorrect syntax

print Foo.Bar()
# OR # 
F = Foo
print F.Bar()

Throws exception:

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

Correct syntax

print Foo().Bar() # Prints "Baz"
# OR #
F = Foo()
print F.Bar()