如何满足我的（多个）条件？答案

【问题标题】：How do I get my (multiple) conditions to be met?如何满足我的（多个）条件？
【发布时间】：2021-10-12 05:06:51
【问题描述】：

所以最近我刚刚使用 if else 语句进行了一项调查，并遇到了我的条件未完全满足的问题。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，当我在（2 到 10）中输入任何内容时，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）在什么情况下工作得很好我需要

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

我觉得我错过了什么，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!")

【问题讨论】：

标签： if-statement python-3.9 multiple-conditions

【解决方案1】：

您已输入字符串并将其与str(18) 进行比较。这是比较两个字符串而不是两个数字。因此，当您执行"9" < "18" 之类的操作时，您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!")

【讨论】：