Question

美好的一天，我有以下片段：

#! /usr/bin/python
#! /usr/bin/python3

from sys import version_info
import logging

py3 = version_info[0] > 2 

if py3:
    name = input('What is your name?: ')
    verify_user(name)
else:
    name = raw_input('What is your name?: ')
    verify_user(name)


def verify_user(name):
    if name is not 'My Admin':
        logging.warning('What the hell are you doing in here ???')
    else:
        logging.info('Welcome Dear Admin')

当我在shell中执行：./ log.py时，我收到以下错误：

verify_user is not define.

不确定发生了什么。我已经定义了verify_user（）。任何帮助都将非常感激。

Answer 1

您在定义之前调用verify_user。将verify_user功能移到文件顶部。

#! /usr/bin/python 
#! /usr/bin/python3

from sys import version_info
import logging

def verify_user(name):
    if name is not 'My Admin':
        logging.warning('What the hell are you doing in here ???')
    else:
        logging.info('Welcome Dear Admin')

py3 = version_info[0] > 2 

if py3:
    name = input('What is your name?: ')
    verify_user(name)
else:
    name = raw_input('What is your name?: ')
    verify_user(name)

Answer 2

Python是dynamic language，因此您需要先定义函数然后再使用它。

解决方案：在使用之前输入整个函数定义。

#! /usr/bin/python
#! /usr/bin/python3

from sys import version_info
import logging

def verify_user(name):
    if name is not 'My Admin':
        logging.warning('What the hell are you doing in here ???')
    else:
        logging.info('Welcome Dear Admin')

py3 = version_info[0] > 2 

if py3:
    name = input('What is your name?: ')
    verify_user(name)
else:
    name = raw_input('What is your name?: ')
    verify_user(name)

如何克服这个问题：python中没有定义函数。

2 个答案: