将字符串转换为 Python 类对象? [英] Convert string to Python class object?

问题描述

给定一个字符串作为 Python 函数的用户输入，如果当前定义的命名空间中有一个具有该名称的类，我想从中获取一个类对象.本质上，我想要一个会产生这种结果的函数的实现:

 Foo 类:经过str_to_class("Foo")==><class __main__.Foo at 0x69ba0>

这可能吗?

解决方案

警告:eval() 可用于执行任意 Python 代码.您应该永远将 eval() 用于不受信任的字符串.(请参阅Python 的 eval() 在不受信任的字符串上的安全性?)

这看起来最简单.

<预><代码>>>>类 Foo(对象):... 经过...>>>评估(富")<class '__main__.Foo'>

Given a string as user input to a Python function, I'd like to get a class object out of it if there's a class with that name in the currently defined namespace. Essentially, I want the implementation for a function which will produce this kind of result:

class Foo:
    pass

str_to_class("Foo")
==> <class __main__.Foo at 0x69ba0>

Is this, at all, possible?

解决方案

Warning: eval() can be used to execute arbitrary Python code. You should never use eval() with untrusted strings. (See Security of Python's eval() on untrusted strings?)

This seems simplest.

>>> class Foo(object):
...     pass
... 
>>> eval("Foo")
<class '__main__.Foo'>

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