The dataset file in assets$/$grades$.$txt contains a line separated list of people with their grade in a class. Create a regex to generate a list of just those students who received a B in the course.

In $[]$ :

import re

def grades$()$:

with open $("$assets$/$grades$.$txt$","$r$")$ as file:

grades $=$ file.read$()$

# YOUR CODE HERE

raise NotImplementedError$()$

In $[]$ : assert len$($grades$())==16$