蟒蛇nonetype错误

-3

import random 

min_num = 1 
max_num = input("Pick your maximum number: ") 
used_num = [] 

def rndnum(used_num): 
    a = random.randint(min_num,max_num) 
    b = random.randint(min_num,max_num) 
    num_string = str(a) + "," + str(b) 
    if num_string not in used_num: 
     return a,b,num_string 
    else: 
     rndnum(used_num) 

def to_continue(used_num): 
    d = raw_input("Press [Enter] to Continue") 
    ask(used_num) 

def finished(): 
    print "Congratulations, you are finished!" 

def ask(used_num): 
    a,b,num_string = rndnum(used_num) 
    c = input(str(len(used_num)+1) + ". What is " + str(a) + " times " + str(b) + "? ") 
    if c == a*b: 
     used_num.append(num_string) 
     print "That is correct! Only " + str(max_num**2 - len(used_num)) + " remaining!" 
     if len(used_num) == max_num**2: 
      finished() 
     else: 
     to_continue(used_num) 
    else: 
     print "That is incorrect." 
     to_continue(used_num) 

ask(used_num)

，这是正在显示的错误：

Traceback (most recent call last): 
    File "/home/philip/Documents/Aptana Studio 3 Workspace/Eli Tests/helloworld.py", line 37, in <module> 
    ask(used_num) 
    File "/home/philip/Documents/Aptana Studio 3 Workspace/Eli Tests/helloworld.py", line 32, in ask 
    to_continue(used_num) 
    File "/home/philip/Documents/Aptana Studio 3 Workspace/Eli Tests/helloworld.py", line 18, in to_continue 
    ask(used_num) 
    File "/home/philip/Documents/Aptana Studio 3 Workspace/Eli Tests/helloworld.py", line 32, in ask 
    to_continue(used_num) 
    File "/home/philip/Documents/Aptana Studio 3 Workspace/Eli Tests/helloworld.py", line 18, in to_continue 
    ask(used_num) 
    File "/home/philip/Documents/Aptana Studio 3 Workspace/Eli Tests/helloworld.py", line 32, in ask 
    to_continue(used_num) 
    File "/home/philip/Documents/Aptana Studio 3 Workspace/Eli Tests/helloworld.py", line 18, in to_continue 
    ask(used_num) 
    File "/home/philip/Documents/Aptana Studio 3 Workspace/Eli Tests/helloworld.py", line 32, in ask 
    to_continue(used_num) 
    File "/home/philip/Documents/Aptana Studio 3 Workspace/Eli Tests/helloworld.py", line 18, in to_continue 
    ask(used_num) 
    File "/home/philip/Documents/Aptana Studio 3 Workspace/Eli Tests/helloworld.py", line 24, in ask 
    a,b,num_string = rndnum(used_num) 
TypeError: 'NoneType' object is not iterable

到底哪里出问题了？谢谢！

来源

2013-01-13 eatonphil

你在最后追溯你的最重要的一行。请包括它。 –

发布实际异常会有所帮助 - 我想问题在于你忘记了'rndnum'函数的其他情况下的'return'。因此它返回'None'，但你打电话给它期待一个三元组元组。 – l4mpi

对不起，忘了我错过了，现在发布。 – eatonphil

您在rndnum函数的最后一行忘记了return。它不会返回值，而是隐含返回None。下面的固定代码。

def rndnum(used_num): 
    a = random.randint(min_num,max_num) 
    b = random.randint(min_num,max_num) 
    num_string = str(a) + "," + str(b) 
    if num_string not in used_num: 
     return a,b,num_string 
    else: 
     return rndnum(used_num)

来源

2013-01-13 22:42:29 Tim

蟒蛇nonetype错误

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