Question

IN PYTHON

Write a function letter2number() that takes a letter grade (A, B, C, D, F, possibly with a ‘-’ or ‘+’) and returns the corresponding number grade. The numeric values for A, B, C, D, and F are 4, 3, 2, 1, 0. A ‘+’ increases the number grade value by 0.3 and a ‘-’ decreases it by 0.3.

>>> letter2number('A-')

3.7

>>> letter2number('C-')

1.7

>>> letter2number('A+')

4.3

>>> letter2number('B')

3.0

>>>

Answer 1

Here is code:

def letter2number(grade):

score = 0

if(grade[0] == 'A'):

score = 4

elif(grade[0] == 'B'):

score = 3

elif(grade[0] == 'C'):

score = 2

elif(grade[0] == 'D'):

score = 1

elif(grade[0] == 'F'):

score = 0

if(len(grade) > 1 and grade[1] == '+'):

score += 0.3

elif(len(grade) > 1 and grade[1] == '-'):

score -= 0.3

return "{:.1f}".format(score)

print(letter2number('A-'))

print(letter2number('C-'))

print(letter2number('A+'))

print(letter2number('B'))

Output: