如何在当前模块上调用setattr()? [英] How do I call setattr() on the current module?

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问题描述

作为第一个参数 object 传递给函数 setattr(object,name,value),在当前模块上设置变量?



例如:

  setattr(object,SOME_CONSTANT,42); 

效果如下:



<$ p包含这些行的模块中的$ p> SOME_CONSTANT = 42

正确的 object )。



我在模块级动态地生成了几个值,在模块级别定义 __ getattr __ ,这是我的后备。

解决方案

 import sys 

thismodule = sys.modules [__ name__]

setattr(thismodule,name,value)

或者不使用 setattr (它打破问题的字母,但满足 - ):

pre code $ globals()[name] = value

注意:在模块范围内,后者相当于:

  vars()[name] = value 

其中是更简洁一点,但不起作用从一个函数中( vars())给出了调用范围的变量:在全局范围调用时的模块变量,然后使用它的R / W ,但函数的变量在函数中调用时,必须将其视为R / O - Python在线文档可能会对这种特定的区别有点混淆)。


What do I pass as the first parameter "object" to the function setattr(object, name, value), to set variables on the current module?

For example:

setattr(object, "SOME_CONSTANT", 42);

giving the same effect as:

SOME_CONSTANT = 42

within the module containing these lines (with the correct object).

I'm generate several values at the module level dynamically, and as I can't define __getattr__ at the module level, this is my fallback.

解决方案

import sys

thismodule = sys.modules[__name__]

setattr(thismodule, name, value)

or, without using setattr (which breaks the letter of the question but satisfies the same practical purposes;-):

globals()[name] = value

Note: at module scope, the latter is equivalent to:

vars()[name] = value

which is a bit more concise, but doesn't work from within a function (vars() gives the variables of the scope it's called at: the module's variables when called at global scope, and then it's OK to use it R/W, but the function's variables when called in a function, and then it must be treated as R/O -- the Python online docs can be a bit confusing about this specific distinction).

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