Code $vv$ Validate

Open in$...$

Python $3($ipykernel$)$

The dataset file in assets$/$grades$.$txt contains multiple lines of people along with their grades in a class. Fix the incorrect regex between ### FIX CODE BELOW and ### FIX CODE ABOVE to generate a list of just those students who received a B in the course $($e$.$g$.,[\text{'}$John Doe', 'Jane Doe'$].)$

$[22]$: def student$\_$grades$()$:

import re

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

grades $=$ file. read$()$

### FIX CODE BELOW

pattern $=r^{\text{'}}\frac{\frac{\frac{?}{?}}{w}\frac{+}{\frac{?}{?}}\frac{s}{\frac{?}{?}}w+}{\frac{?}{?}}s{B}^{\text{'}}$

matches $=$ re$.$findall $($pattern$,$ grades$)$

### FIX CODE ABOVE

# YOUR CODE HERE

return matches

$[20]$: assert len$($student$\_$grades $()$