关于Python：Python – TypeError：/：’int’和’NoneType’不支持的操作数类型

Python - TypeError: unsupported operand type(s) for /: 'int' and 'NoneType'

问题

我正在制定一个能告诉你成绩的计划。我已经得到了所有的用户输入，现在我需要做一些计算。当调用计算加权平均值时，我的问题就出现了。它将参数作为整数(至少我认为它是这样的：我要求它向print(x, y, z)输入，它会打印两次，一次是x、y、z的正确输入，另一次是x的正确输入，但它会打印y和z作为无)，但它拒绝执行我要求它执行的数学操作。函数是否应该能够接受参数并执行这个简单的操作：( x + y ) * z？所以出于某种原因Y和Z变为"无"，这就是我需要解决的问题！

代码

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def main():
tests = get_initial_input("tests")
assignments = get_initial_input("assignments")
exercises = get_initial_input("exercises")
labs = get_initial_input("labs")
finals = get_initial_input("finals")
testsp = get_percents(tests ,"tests")
assignmentsp = get_percents(assignments,"assignments")
exercisesp = get_percents(exercises,"exercises")
labsp = get_percents(labs,"labs")
finalsp = get_percents(finals,"finals")
testst = get_totals(tests,"tests")
assignmentst = get_totals(assignments,"assignments")
exercisest = get_totals(exercises,"exercises")
labst = get_totals(labs,"labs")
finalst = get_totals(finals,"finals")
testss = get_scores(tests,"tests")
assignmentss = get_scores(assignments,"assignments")
exercisess = get_scores(exercises,"exercises")
labss = get_scores(labs,"labs")
finalss = get_scores(finals,"finals")
testsz = calculate_weighted_average(testss, testst, testsp)
assignmentsz = calculate_weighted_average(assignmentss, assignmentst, assignmentsp)
exercisesz = calculate_weighted_average(exercisess, exercisest, exercisesp)
labsz = calculate_weighted_average(labss, labst, labsp)
finalsz = calculate_weighted_average(finalss, finalst, finalsp)
def get_initial_input(x):
val = int(input("How many"+ x +" were there? "))
return val

def get_percents(x, string):
if x > 0:
xp = int(input("What percentage are"+ string +" weighted? "))
return xp

def get_totals(x, string):
if x > 0:
xt = int(input("How many total points available in the"+ string +" category? "))
return xt

def get_scores(x, string):
total = 0
for y in range(x):
xs = int(input("Scores for"+ string +" ?: "))
total = total + xs
return total
def calculate_weighted_average(x, y, z):
print(x, y, z)
this = ( x / y ) * z
return this

main()

追溯

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How many tests were there? 2
How many assignments were there? 0
How many exercises were there? 0
How many labs were there? 0
How many finals were there? 0
What percentage are tests weighted? 20
How many total points available in the tests category? 20
Scores for tests ?: 20
Scores for tests ?: 20
40 20 20
0 None None
Traceback (most recent call last):
File"assignment7.py", line 61, in <module>
main()
File"assignment7.py", line 23, in main
assignmentsz = calculate_weighted_average(assignmentss, assignmentst, assignmentsp)
File"assignment7.py", line 49, in calculate_weighted_average
this = ( x / y ) * z
TypeError: unsupported operand type(s) for /: 'int' and 'NoneType'

号

提前谢谢你