如何将字符串转换为变量名? [英] How to convert string to variable name?

问题描述

我想知道如何将字符串输入转换为变量名以用于 Python 代码.一个具体的例子:

I would like to know how to convert a string input into a variable name to use into Python code. A concrete example:

def insrospect(foo, bar):
    requested_module = makestringvariable(foo)
    requested_object = makestringvariable(bar)
    import requested_module
    for item in inspect.getmemebers(requested_module.requested_object):
        member = makestringvariable(item[0])
        if callable(requested_object.member):
           print item

if __name__ == '__main__':
    introspect(somemodule, someobject)

所以在上面，因为我不知道在启动前要内省哪个模块，我需要将字符串转换为可用的模块名称，并且因为 getmembers() 将成员作为字符串返回，我也需要将它们转换为可用的变量名称以检查它们是否可调用.

So here above, because i do not know which module to introspect before launching, i need to convert the string to a usable module name and because getmembers() returns the members as strings, i also need them to be converted into usable variable names to check if they are callable.

有没有这样的makestringvariable()函数?

推荐答案

with the __import__ 函数和 getattr 魔法，你将能够直接写这个:

with the __import__ function and the getattr magic, you will be able to directly write this :

import importlib
def introspect(foo, bar):
    imported_module = importlib.import_module(foo)
    imported_object = getattr(imported_module, bar)
    for item in inspect.getmembers(imported_object):
        if callable(getattr(imported_object, item[0]):
           print item

if __name__ == '__main__':
    introspect(somemodule, someobject)

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