Answer:
def GPAcalc(g):
if g == "a" or g == "A":
return 4
elif g == "B" or g == "b":
return 3
elif g == "C" or g == "c":
return 2
elif g == "D" or g == "d":
return 1
elif g == "F" or g == "f":
return 0
else:
return "Invalid"
grade = input("Enter your Letter Grade: ")
gpa = GPAcalc(grade)
print("Your GPA score is: " + str(gpa))
Step-by-step explanation: