Error installing pygame

I'm trying to install pygame in my python 2.7. I do it in this python because for some reason if I try to install pip in python 3.7 it will not let me. From the terminal I entered:

sudo pip install pygame

And supposedly installed it well, but when I try to do the import it says:

Traceback (most recent call last):
  File "ejemplo.py", line 1, in <module>
    import pygame
ImportError: No module named pygame

If I try to do again sudo pip install pygame says:

Requirement already satisfied: pygame in /home/cesar/.local/lib/python2.7/site-packages (1.9.4)

Also, if I try to run pip list and look for pygame I get installed:

pygame                        1.9.4   

What may be happening? Why do you tell me that the requirement is already met if you are not able to import the module?