Python - 需要一个缩进 block

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只是 Python 的初学者，试图将 GPA 计算器作为一个基本项目，但语法错误:“预期有缩进 block ”

import keyword

classes = int(input("How many classes do you need to calculate?: "))

gpa = 0.0

if classes == 1:

    credits = int(input("Please enter the amount of credit hours of the class: "))
    grade = input("What was the grade you have earned?: ")

    letter_points = letterGradeConversion()

    print(letter_points)

elif classes == 2:

    credits = int(input("Please enter the amount of credit hours of the first class: "))
    grade = input("What was the grade you have earned?: ")

    credits = int(input("Please enter the amount of credit hours of the  second class: "))
    grade = input("What was the grade you have earned?: ")


elif classes == 3:

    credits = int(input("Please enter the amount of credit hours of the first class: "))
    grade = input("What was the grade you have earned?: ")

    credits = int(input("Please enter the amount of credit hours of the second class: "))
    grade = input("What was the grade you have earned?: ")

    credits = int(input("Please enter the amount of credit hours of the third class: "))
    grade = input("What was the grade you have earned?: ")

elif classes == 4:
    credits = int(input("Please enter the amount of credit hours of the first class: "))
    grade = input("What was the grade you have earned?: ")

    credits = int(input("Please enter the amount of credit hours of the second class: "))
    grade = input("What was the grade you have earned?: ")

    credits = int(input("Please enter the amount of credit hours of the third class: "))
    grade = input("What was the grade you have earned?: ")    

    credits = int(input("Please enter the amount of credit hours of the fourth class: "))
    grade = input("What was the grade you have earned?: ")

else:
    print("The max number of classes on this application is currently 4")

def letterGradeConversion():
if grade == A:
    gpa = gpa + 4    
elif grade == B:
    gpa = gpa + 3
elif grade == C:
    gpa = gpa + 2
elif grade == D:
    gpa = gpa + 1
elif grade == F:
    gpa = gpa + 0
else:
    print("That is not a valid letter grade")

不在代码中:

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Answer 1

您的函数定义(def ... : 之后的所有内容)必须缩进。

所以

def letterGradeConversion():
    if grade == A:
        gpa = gpa + 4 
    ...

代替

def letterGradeConversion():
if grade == A:
    gpa = gpa + 4 
...