Question

I’m new to Python. I have a method that begins:

def foo(self, list):
    length = len(list)

I’ve called len() successfully in other cases, but here I get:

TypeError: object of type 'type' has no len()

How do I convince Python that this object passed in is a list? What am I missing?

Answer 1

Because list is the name of the list type.

Use a different name.

def foo(self, lst):
    length = len(lst)

And make sure you didn’t call foo like this:

Foo.foo(list)