Python类型错误：字符串与浮点数无法执行-=运算问题求助

错误原因 #

触发TypeError: unsupported operand type(s) for -=: 'str' and 'float'的核心问题是：answer2从input()获取后一直是字符串类型，哪怕你用int(answer2)做了大小判断，但并没有把answer2本身转为数值类型，后续执行answer2 -= x时，字符串和数值无法进行减法运算，直接报错。

修正方案 #

1. 确认输入是有效数字后，立即将answer2转换为整数类型
2. 循环中对x的除法改用整数除法//，避免x变成浮点数，同时符合二进制位判断的逻辑

修正后的完整代码 #

import math

x = 4096
y = ""
z = 10
q = 1
final_answer = 0

answer1 = input("Do you want to convert decimal into binary (1) or binary into decimal (2)?")
if answer1 == "1":
    answer2 = input("What number do you want to convert to binary? It can't be larger than 4096")
    p = answer2.isdigit()
    if p:
        # 转换为整数类型
        answer2 = int(answer2)
        for i in range(13):
            if answer2 >= x:
                y += "1"
                answer2 -= x
            else:
                y += "0"
            # 使用整数除法，保持x为整数
            x = x // 2
        print(y)
    else:
        print("That's not a number")

内容的提问来源于stack exchange，提问作者BenDeagle