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if-statement - 如何满足我的（多个）条件？

问题描述

所以最近我一直在用 if else 语句进行一项调查，并遇到了我的条件没有完全得到满足的问题。起初，我的代码似乎运行良好，但后来我意识到，在某些输入下，代码会崩溃或响应不同的条件。

我最大的问题是当我输入任何输入（2 到 10）时，它指的是只有在输入大于 18 时才可能出现的条件......但是数字（10 到 17）完全可以满足我的需要

同样，对于任何 100 及以上的数字，它都不是指 >18 代码，而是指小于 <18

我觉得我错过了一些东西，这是下面的代码，请帮助

print("Welcome user, today we will be evaluating if you need to sign up for selective service or not.\n"
      "DO NOT LIE!")
print("")
name = input("Please enter your name: ")
age = input("Please enter your age: ")
Male = "M".casefold()
Female = "F".casefold()
gender = input("Please enter an (M or F) for gender identity: ").casefold()

if age >= str(18) and gender == Male:
    print("Welcome {}, since you are a Male that is 18 or over please sign where directed for selective service".format(name))
    input("Name and DOB: ")
    print("You will get a letter/email if your service is ever required.")

if age < str(18)) and gender == Male:
    print("You are not required to signup for selective service yet {}, please return in {} years.".format(name, 18-int(age)))

else:
    if gender == Female:
        print("You do not meet the criteria to sign up, have a good day!")

标签： if-statementpython-3.9multiple-conditions

解决方案

您已获取字符串输入并将其与str(18). 这是比较两个字符串而不是两个数字。所以当你做类似的事情时"9" < "18"，你实际上是在比较它们的Unicode 值而不是数字本身。因此，将整数转换为字符串会将您的输入字符串转换为整数，因此您的代码应该是这样的：

print("Welcome user, today we will be evaluating if you need to sign up for selective service or not.\n"
      "DO NOT LIE!")
print("")
name = input("Please enter your name: ")
age = input("Please enter your age: ")
Male = "M".casefold()
Female = "F".casefold()
gender = input("Please enter an (M or F) for gender identity: ").casefold()

if int(age) >= 18 and gender == Male:
    print("Welcome {}, since you are a Male that is 18 or over please sign where directed for selective service".format(name))
    input("Name and DOB: ")
    print("You will get a letter/email if your service is ever required.")

if int(age) < 18 and gender == Male:
    print("You are not required to signup for selective service yet {}, please return in {} years.".format(name, 18-int(age)))

else:
    if gender == Female:
        print("You do not meet the criteria to sign up, have a good day!")

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