NameError:名称“一个"未定义python 3.4错误 [英] NameError: name 'one' is not defined python 3.4 error

问题描述

a=str(input("Enter num To Start FunctionOne"))
if(a == '1'):
    one()



elif (a == '2'):
    tow()




def one():
    print('Good')

def tow():
    print('Very Good')

错误

Enter numper To Start FunctionOne1
Traceback (most recent call last):
  File "C:/Users/Hacker/Desktop/complex program.py", line 3, in <module>
    one()
NameError: name 'one' is not defined

推荐答案

您需要先定义函数，然后再调用它们:

You need to define the functions before calling them:

def one():
    print('Good')

def tow():
    print('Very Good')

a=str(input("Enter num To Start FunctionOne"))
if(a == '1'):
    one()



elif (a == '2'):
    tow()

如果您调用一个函数但该函数在其下定义，则它将无法正常工作，因为Python尚不知道该函数调用应该做什么.

If you call a function but the function is defined below it then it won't work because Python doesn't know yet what that function call is supposed to do.

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