Question

print ("\n" * 100)
def weight_rep():
    rep = 0
    try:
        rep = int(input("How many times would you like to enter a weight?\n"))
        return rep
    except ValueError:
        print ("\n" * 100)
        print("*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*")
        print("You must enter a valid number that is:\n1) Whole\n2) Positive")
        print("*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*")
        weight_rep()
        return rep

rep = weight_rep()

weight = []

for i in range (0, (rep)):
    weightn = int(input("Please input weight " + str(i+1) +":\n"))
    weight.append(weightn)
    print (weight[i])
mean = sum(weight)/int(len(weight))
print("The average weight of these fruits is {0:.2f}g".format(mean))

如果我在第一阶段输入正确的数字，这个简单的代码会按预期进行，但是，当我输入重复weight_rep（）函数然后输入内容的东西时，该函数返回nonetype

Answer 1

这些行：

weight_rep()
return rep

应该成为：

return weight_rep()

虽然我不建议你做过递归调用，但上面的内容将解决你当前的问题。

Python验证函数返回非类型

1 个答案: