[已解决]已经转换整型，为什么输入小数后报错

PS2020

import random
secret = random.randint(1,10)
print('-------我爱python----------')
temp = input("猜数字:")
guess = int(temp)
while guess != secret:
    temp = input("错了，继续:")
    guess = int(temp)
    if guess == secret:
        print("我艹！！！")
        print("哼")
    else:
        if guess > secret:
            print("你大了")
        else:
            print("你小了")
print("无聊，不玩了")

最佳答案

月排行榜 / 总排行榜

昨非

2020-10-27 22:13:35

input返回值是字符型，含有小数点时，强制转换为int时会报错
语法规则
用eval

1. secret = random.randint(1,10)
   
2. print('-------我爱python----------')
   
3. temp = eval(input("猜数字:"))
   
4. guess = int(temp)
   
5. while guess != secret:
   
6.     temp = eval(input("错了，继续:"))
   
7.     guess = int(temp)
   
8.     if guess == secret:
   
9.         print("我艹！！！")
   
10.         print("哼")
    
11.     else:
    
12.         if guess > secret:
    
13.             print("你大了")
    
14.         else:
    
15.             print("你小了")
    
16. print("无聊，不玩了")

复制代码

跳转到最佳答案楼层

昨非

input返回值是字符型，含有小数点时，强制转换为int时会报错
语法规则
用eval

1. secret = random.randint(1,10)
   
2. print('-------我爱python----------')
   
3. temp = eval(input("猜数字:"))
   
4. guess = int(temp)
   
5. while guess != secret:
   
6.     temp = eval(input("错了，继续:"))
   
7.     guess = int(temp)
   
8.     if guess == secret:
   
9.         print("我艹！！！")
   
10.         print("哼")
    
11.     else:
    
12.         if guess > secret:
    
13.             print("你大了")
    
14.         else:
    
15.             print("你小了")
    
16. print("无聊，不玩了")

复制代码

笨鸟学飞

>>> help(input)
Help on built-in function input in module builtins:

input(prompt=None, /)
    Read a string from standard input.  The trailing newline is stripped.
   
    The prompt string, if given, is printed to standard output without a
    trailing newline before reading input.
   
    If the user hits EOF (*nix: Ctrl-D, Windows: Ctrl-Z+Return), raise EOFError.
    On *nix systems, readline is used if available.
=======input()函数是获取并返回用户输入的字符串，返回值类型是字符串===========
>>> help(int)
Help on class int in module builtins:

class int(object)
|  int([x]) -> integer
|  int(x, base=10) -> integer
|  
|  Convert a number or string to an integer, or return 0 if no arguments
|  are given.  If x is a number, return x.__int__().  For floating point
|  numbers, this truncates towards zero.
|  
|  If x is not a number or if base is given, then x must be a string,
|  bytes, or bytearray instance representing an integer literal in the
|  given base.  The literal can be preceded by '+' or '-' and be surrounded
|  by whitespace.  The base defaults to 10.  Valid bases are 0 and 2-36.
|  Base 0 means to interpret the base from the string as an integer literal.
==========int()函数说明文档已经写的很清楚了，字符串只接受‘+’‘—’号和纯数字==========
>>> int('-3')
-3
>>> int('+3')
3
>>> int('1.2')
Traceback (most recent call last):
  File "<pyshell#20>", line 1, in <module>
    int('1.2')
ValueError: invalid literal for int() with base 10: '1.2'

因此报错，错误在参数字符串型‘1.2’