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动态进口和制造班级
原标题:Dynamically import and create class instance
  • 时间:2011-11-14 10:01:21
  •  标签:
  • python

我在申请发言后,有40个单元(类别),其中有一部分文本的斜体。 在我的职能中,我只想对某个单元进行修饰和使用。 这些均在数据库中进行分类。

现在,我知道我的教官,并且有我想要进口和制造的假名和阶级。

然而......。 你们实际上如何在晚上这样做?

指称;

file_name =  lex_parser 
class_name =  LexParser 

how can I do....

from {file_name} import {class_name}
Parser = {class_name}()

Follow what I mean?

最佳回答

为此:

file_name =  lex_parser 
class_name =  LexParser 

Parser = getattr(__import__(file_name), class_name)

注:file_name/code> 不得包含<代码>py

如果该模块属于一揽子计划,那么该模块就会赢得一定的工作,因为-import__将回到顶级一揽子计划。 在这种情况下,你可以这样做:

import sys

file_name =  parsers.lex_parser 
class_name =  LexParser 

__import__(file_name)
Parser = getattr(sys.modules[file_name], class_name)

This will work in both cases and is recommeded by the __import__ function documentation.

在两个例子中,<代码>Parser是你通常必须做的一类:

parser = Parser()
问题回答

如何做这样的事情:

module = __import__( my_module )
if hasattr(module,  ClassName ):
    ClassName = module.ClassName
    my_object = ClassName()




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