[已解决]Type error 的问题

Someone000

1. def question(heads, legs):
   
2.     rabbit_number_max = legs // 4
   
3.     rabbit_number = 0
   
4.     while True:
   
5.         chicken_number = (legs - rabbit_number * 4) / 2
   
6.         if chicken_number == int(chicken_number) and rabbit_number + chicken_number == heads:
   
7.             return (chicken_number, rabbit_number)
   
8.         elif rabbit_number <= rabbit_number_max:
   
9.             rabbit_number += 1
   
10.         else:
    
11.             print('题目错误啦*_*！此题无解！')
    
12. 
    
13. def number(heads, legs):
    
14.     if heads <= 0 or heads != int(heads):
    
15.         print('头的参数错误T_T！请输入一个正整数！')
    
16.         heads = float(input('请重新输入头的个数：'))
    
17.       
    
18.     elif legs <= 0 or legs != int(legs):
    
19.         print('脚的参数错误T_T！请输入一个正整数！')
    
20.         legs = float(input('请重新输入：'))
    
21.       
    
22.     else:
    
23.         return(heads, legs)
    
24. 
    
25. heads = float(input('请输入头的个数：'))
    
26. legs = float(input('请输入脚的个数：'))
    
27. (true_heads, true_legs) = number(heads, legs)
    
28. (chicken_number, rabbit_number) = question(true_heads, true_legs)
    
29. print('鸡的个数是%d, 兔的个数是%d' % (int(chicken_number), int(rabbit_number)))
    

复制代码

请输入头的个数：34.5
请输入脚的个数：94
头的参数错误T_T！请输入一个正整数！
请重新输入头的个数：35
Traceback (most recent call last):
  File "C:/Users/Documents/学习/python/作业簿/鸡兔同笼.py", line 27, in <module>
    (true_heads, true_legs) = number(heads, legs)
TypeError: cannot unpack non-iterable NoneType object

最佳答案

月排行榜 / 总排行榜

txxcat

2020-3-25 19:47:04

几个错误，解释看代码里的注释：

1. def question(heads, legs):
   
2.     rabbit_number_max = legs // 4
   
3.     rabbit_number = 0
   
4.     while True:
   
5.         chicken_number = (legs - rabbit_number * 4) / 2
   
6.         if chicken_number == int(chicken_number) and rabbit_number + chicken_number == heads:
   
7.             return (chicken_number, rabbit_number)
   
8.         elif rabbit_number <= rabbit_number_max:
   
9.             rabbit_number += 1
   
10.         else:
    
11.             print('题目错误啦*_*！此题无解！')
    
12.             break           #无解就无限循环了，至少加个break吧，然后默认返回None
    
13. 
    
14. 
    
15. def number(heads, legs):
    
16.     if heads <= 0 or heads != int(heads):
    
17.         print('头的参数错误T_T！请输入一个正整数！')
    
18.         heads = float(input('请重新输入头的个数：'))
    
19. #没有返回呀，默认返回None      
    
20.     elif legs <= 0 or legs != int(legs):
    
21.         print('脚的参数错误T_T！请输入一个正整数！')
    
22.         legs = float(input('请重新输入：'))
    
23. #同上      
    
24. #    else:  这样改就有正常的返回了
    
25.     return(heads, legs)
    
26. 
    
27. heads = float(input('请输入头的个数：'))
    
28. legs = float(input('请输入脚的个数：'))
    
29. (true_heads, true_legs) = number(heads, legs)
    
30. if question(true_heads, true_legs)!=None:   #加个判断，不然无解还运行下面语句就报错
    
31.     (chicken_number, rabbit_number) = question(true_heads, true_legs)
    
32.     print('鸡的个数是%d, 兔的个数是%d' % (int(chicken_number), int(rabbit_number)))
    

复制代码

跳转到最佳答案楼层

永恒的蓝色梦想

1. def question(heads, legs):
   
2.     rabbit_number_max = legs // 4
   
3.     rabbit_number = 0
   
4.     while True:
   
5.         chicken_number = (legs - rabbit_number * 4) / 2
   
6.         if chicken_number == int(chicken_number) and rabbit_number + chicken_number == heads:
   
7.             return (chicken_number, rabbit_number)
   
8.         elif rabbit_number <= rabbit_number_max:
   
9.             rabbit_number += 1
   
10.         else:
    
11.             print('题目错误啦*_*！此题无解！')
    
12. 
    
13. def number(heads, legs):
    
14.     if heads <= 0 or heads != int(heads):
    
15.         print('头的参数错误T_T！请输入一个正整数！')
    
16.         heads = float(input('请重新输入头的个数：'))
    
17.       
    
18.     elif legs <= 0 or legs != int(legs):
    
19.         print('脚的参数错误T_T！请输入一个正整数！')
    
20.         legs = float(input('请重新输入：'))
    
21.       
    
22.     return(heads, legs)
    
23. 
    
24. heads = float(input('请输入头的个数：'))
    
25. legs = float(input('请输入脚的个数：'))
    
26. (true_heads, true_legs) = number(heads, legs)
    
27. (chicken_number, rabbit_number) = question(true_heads, true_legs)
    
28. print('鸡的个数是%d, 兔的个数是%d' % (int(chicken_number), int(rabbit_number)))

复制代码

txxcat

几个错误，解释看代码里的注释：

1. def question(heads, legs):
   
2.     rabbit_number_max = legs // 4
   
3.     rabbit_number = 0
   
4.     while True:
   
5.         chicken_number = (legs - rabbit_number * 4) / 2
   
6.         if chicken_number == int(chicken_number) and rabbit_number + chicken_number == heads:
   
7.             return (chicken_number, rabbit_number)
   
8.         elif rabbit_number <= rabbit_number_max:
   
9.             rabbit_number += 1
   
10.         else:
    
11.             print('题目错误啦*_*！此题无解！')
    
12.             break           #无解就无限循环了，至少加个break吧，然后默认返回None
    
13. 
    
14. 
    
15. def number(heads, legs):
    
16.     if heads <= 0 or heads != int(heads):
    
17.         print('头的参数错误T_T！请输入一个正整数！')
    
18.         heads = float(input('请重新输入头的个数：'))
    
19. #没有返回呀，默认返回None      
    
20.     elif legs <= 0 or legs != int(legs):
    
21.         print('脚的参数错误T_T！请输入一个正整数！')
    
22.         legs = float(input('请重新输入：'))
    
23. #同上      
    
24. #    else:  这样改就有正常的返回了
    
25.     return(heads, legs)
    
26. 
    
27. heads = float(input('请输入头的个数：'))
    
28. legs = float(input('请输入脚的个数：'))
    
29. (true_heads, true_legs) = number(heads, legs)
    
30. if question(true_heads, true_legs)!=None:   #加个判断，不然无解还运行下面语句就报错
    
31.     (chicken_number, rabbit_number) = question(true_heads, true_legs)
    
32.     print('鸡的个数是%d, 兔的个数是%d' % (int(chicken_number), int(rabbit_number)))
    

复制代码

dlnb526

同意楼上两位的代码。（至少可以顺利执行）
出现错误的原因是当遇到其他情况时number函数并不会返回一个元组，这样就没有办法再把参数传入question函数。
在你的实验中，输出了

1. 头的参数错误T_T！请输入一个正整数！

复制代码

之后，会直接执行下一行代码

1. (chicken_number, rabbit_number) = question(true_heads, true_legs)

复制代码

因此return需要在任何条件都实现才可以继续进行。除了楼上的解决方式，你还可以：
1.在number函数中添加一个while循环以保证输入正确时才会跳出函数
2.在执行代码区使用try except语句避免报错

希望对你有所帮助