Object of type 'map' has no len() in Python 3

Question

I have a problem with Python 3. I got Python 2.7 code and at the moment I am trying to update it. I get the error:

TypeError: object of type \'map\' h

Answer 1

In Python 3, map returns a map object not a list:

>>> L = map(str, range(10))
>>> print(L)

You can convert it into a list then get the length from there:

>>> print(len(list(L)))
10