Python中如何使变量赋值与if条件判断正常工作？

两个核心错误修正： #

1. 字符串比较未加引号
   代码第7行的m是未定义的变量，而用户输入的sex是字符串类型，必须和字符串'm'做比较。将if sex == m:改为if sex == 'm':。

2. 输入未转换为整数
   第5行中，input()返回的是字符串，直接和整数52相乘会触发类型错误，需要先把输入转换为整数：
   原代码：ca = input("What is your current age in years? ") * 52
   修改为：ca = int(input("What is your current age in years? ")) * 52

修正后的完整代码： #

# This works until line 7
sex = input("Are you male(m) or female(f)? ")
me = 75 * 52
fe = 80 * 52
ca = int(input("What is your current age in years? ")) * 52
print(sex)  # This is returning the input from the first line.
if sex == 'm':
    print(f"You have approximately {me - ca} weeks to live. ")
else:
    print(f"You have approximately {fe - ca} weeks to live. ")

内容的提问来源于stack exchange，提问作者eyeclick