Question

以下程序有效，但在给出结果时，后跟“无”。如何删除该效果？感谢。

def grades(score):
if score > 1.0:
    print("Error, please enter numeric input between 0 and 1.0.")
elif score >= 0.9:
    print("The score is: A.")
elif score >= 0.8:
    print("The score is: B.")
elif score >= 0.7:
    print("The score is: C.")
elif score >= 0.6:
    print("The score is: D.")
elif score >= 0:
    print("The score is: F.")
else:
    print("Error, please enter numeric input between 0 and 1.0.")

try:
    score1 = float(input("Enter Score: "))
    x = grades(score1)
    print(x)
except:
    print("Error, please enter numeric input between 0 and 1.0.")

Answer 1

最后不要print(x)。 x是grades函数的返回值，由于您从不使用return，因此默认值为None。所以就这样做

try:
    score1 = float(input("Enter Score: "))
    grades(score1)
except:
    ...

Answer 2

你没有从功能中返回任何东西。而不是使用print，使用return并使用相同的代码。它不会打印。否则你可以删除print（x）。下面应该工作

def grades(score):
        if score > 1.0:
            print("Error, please enter numeric input between 0 and 1.0.")
        elif score >= 0.9:
            print("The score is: A.")
        elif score >= 0.8:
            print("The score is: B.")
        elif score >= 0.7:
            print("The score is: C.")
        elif score >= 0.6:
            print("The score is: D.")
        elif score >= 0:
            print("The score is: F.")
        else:
            print("Error, please enter numeric input between 0 and 1.0.")

try:
    score1 = float(input("Enter Score: "))
    x = grades(score1)
    #print(x)
except:
    print("Error, please enter numeric input between 0 and 1.0.")

Answer 3

您不会从properties.setProperty("mail.smtp.host", host); properties.setProperty("mail.smtp.port", port);返回任何内容，因此grades()为x

Answer 4

成绩是一个不返回任何东西的函数所以当你写作

x = grades(score1)

x未获得任何值集

因为成绩函数不会返回任何内容

so, print(x) prints None

删除

 x = grades(score1)
 print(x)

并将其替换为

 grades(score1)

你不会得到无

或者如果您想存储成绩的值，然后打印它将成绩函数更改为

def grades(score):
if score > 1.0:
    return "Error, please enter numeric input between 0 and 1.0."
elif score >= 0.9:
    return "The score is: A."
elif score >= 0.8:
    return "The score is: B."
elif score >= 0.7:
    return "The score is: C."
elif score >= 0.6:
    return "The score is: D."
elif score >= 0:
    return "The score is: F."
else:
    return "Error, please enter numeric input between 0 and 1.0."
elif score >= 0:
    return "The score is: F."
else:
    return "Error, please enter numeric input between 0 and 1.0."

输入分数以获得Python成绩

4 个答案: