Problem with importing and using collections module

[pythomdummy]

Greatings,

I am a new to python and actually whole concept of programming.

Since last one one month i have been working hard but getting stuck many times because training material i have are from instructors who made it on python 2.

I am learning to create a base file for my games references.

I have import collections module

import collections

then while creating vector i used it

class vector(collection.Sequence)

and now the problem start. whenever i tried using vector class for my game but i have error:

Traceback (most recent call last):
File "d:/pYtHON/Pythongames/base.py", line 18, in <module>
class vector(collection.Sequence):
NameError: name 'collection' is not defined

Please share resolution with little explanation to understand it for future reference. Thank You.