如何知道谁在python中导入我？ [英] How to know who is importing me in python?

问题描述

如何找出在python中导入特定文件的文件？

How can I find out what file is importing a particular file in python?

请考虑以下示例：

#a.py
import cmn
....

#b.py
import cmn
...

#cmn.py
#Here, I want to know which file (a.py or b.py)
#is importing this one.
#Is it possible to do this?
...

所有文件 a.py ， b.py 和 cmn.py 位于同一目录中。

All the files a.py, b.py and cmn.py are in the same directory.

为什么我要这样做？

在C / C ++中，它们具有包含功能。我想做的事情可以用C / C ++代码来说明。

Why do I want to do this?
In C/C++, they have include feature. What i want to do can illuminate by the C/C++ code.

//a.cpp
....
#define SOME_STUFF   ....
#include "cmn.h"

//b.cpp
...
#define SOME_STUFF   ....

#include "cmn.h"

//cmn.h
//Here, I'll define some functions/classes that will use the symbol define
//in the a.cpp or b.cpp
...
....code refer to the SOME_STUFF.....

在C / C ++中，我们可以使用此方法重用sourecode。

In C/C++, we can use this method to reuse sourecode.

现在返回我的python代码。

当a.py导入cmn.py时，我希望运行cmn.py并且cmn.py将引用a.py中定义的符号。

当b.py导入cmn.py时，我希望运行cmn.py，cmn.py将引用b.py中定义的符号。

Now return to my python code.
When a.py import cmn.py, i hope to run cmn.py and the cmn.py will refer to the symbol defined in the a.py.
When b.py import cmn.py, i hope to run cmn.py and the cmn.py will refer to the symbol defined in the b.py.

推荐答案

集合模块中的 namedtuple 代码有一个示例，说明如何（以及何时）执行此操作：

The namedtuple code in the collections module has an example of how (and when) to do this:

#cmn.py
import sys
print 'I am being imported by', sys._getframe(1).f_globals.get('__name__')

这种方法的一个限制是最外面的模块总是命名为 __ main __ 。如果是这种情况，可以从 sys.argv [0] 确定最外层模块的名称。

One limitation of this approach is that the outermost module is always named __main__. If that is the case, the name of the outermost module can be determined from sys.argv[0].

第二个限制是，如果使用sys._getframe的代码在模块范围内，则只在第一次导入cmn.py时执行。如果要监视模块的所有导入，则需要在导入后调用某种函数。

A second limitation is that if the code using sys._getframe is in the module scope it is only executed on the first import of cmn.py. You'd need to call a function of some sort after imports if you want to monitor all imports of the module.

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