从外部模块调用类会导致NameError，在IDLE它工作正常 [英] calling class from an external module causes NameError, in IDLE it works fine

问题描述

我在模块中有以下代码：code_database.py

i have the following code in a module called code_database.py

class Entry():
    def enter_data(self):
        self.title = input('enter a title: ')
        print('enter the code, press ctrl-d to end: ')
        self.code = sys.stdin.readlines()
        self.tags = input('enter tags: ')

    def save_data(self):
        with open('entry.pickle2', 'ab') as f:
            pickle.dump(self, f)

类定义的方法工作正常：

in idle the class-defined methods work fine:

>>> import code_database
>>> entry = code_database.Entry()
>>> entry.enter_data()
enter a title: a
enter the code, press ctrl-d to end: 
benter tags: c
>>> entry.title
'a'
>>> entry.code
['b']
>>> entry.tags
'c'
>>> 

然而，如果我从外部程序调用模块并尝试调用方法， ：

however if i call the module from an external program and try to call the methods, they raise a NameError:

import code_database

    entry = code_database.Entry()
    entry.enter_data()
    entry.save_data()

会在终端中导致此情况：

causes this in the terminal:

$python testclass.py 
enter a title: mo
Traceback (most recent call last):
  File "testclass.py", line 6, in <module>
    entry.enter_data()
  File "/home/mo/python/projects/code_database/code_database.py", line 8, in enter_data
    self.title = input('enter a title: ')
  File "<string>", line 1, in <module>
NameError: name 'mo' is not defined

推荐答案

当您运行 testclass.py 文件时，您正在使用python-2.x。然而，你的代码，似乎是为python-3.x版本。在python-2.x中，你需要使用 raw_input 函数来达到相同的目的，你可以在python-3中使用 input 。X。您可以运行

You're using python-2.x when running your testclass.py file. Your code, however, seems to be written for python-3.x version. In python-2.x you need to use raw_input functions for the same purpose you would use input in python-3.x. You could run

$ python --version

要确定默认使用的是什么版本。

To find out what exactly version you're using by default.

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