Python策略模式：动态导入类文件

Question

I am trying to build a software package that fixes arbitrary data inconsistencies in one of my databases. My design includes two classes - Problem and Fix .

The problems are SQL queries stored as .cfg files (eg problem_001.cfg ), and the fixers are stored as Python files (eg fix_001.py ). The query config file has a reference to the Python file name. Each fixer has a single class Fix , which inherits from a base class BaseFix .

`-- problems
    |-- problem_100.cfg
    |-- problem_200.cfg
    |-- problem_300.cfg
    `-- ...
`-- fixer
    |-- __init__.py
    |   |-- fixers
    |   |   |-- fix_100.py
    |   |   |-- fix_200.py
    |   |   |-- fix_300.py
    |   |   |-- ...
    |   `-- ...
    `-- ...

I would like to instantiate Problem files and supply them with Fix objects in a clean way. Is there a way to do it without keepping all the fixers in the same file?

UPDATE:

This is the final code that worked (thanks, @Space_C0wb0y):

    fixer_name='fix_100'
    self.fixer=__import__('fixer.fixers', globals(), locals(), 
                 [fixer_name]).__dict__[fixer_name].Fix() 

Answer 1

You can dynamically import modules using the builtin __import__ , which takes the module-name as string-argument (see here ). The modules do have to be in the module search path .