如何在python中取消缓存导入的模块？

Question

This is really freaking me out. My project looks like this

.
|-- main.py
|-- classes
|   |-- __init__.py
|   |-- exceptions.py

In those exceptions.py , I initally created one exception called SecurityError :

class SecurityError(Exception):
    pass   

I included the file in main.py using from classes.exceptions import * and SecurityError normally works when I just raise it.

Afterwards, I also added FilesystemError , but whenever using it, I get:

global name 'FilesystemError' is not defined

I tried to delete *.pyc files in classes directory but it has no effect. Any changes to the exceptions.py take no effect, including any ridiculous ones that make the file invalid:

class FileFOO BAR BAZ systemError(Exception):
    pass

class SecurityErr foo bar bazor(Exception):
    pass    

The program still behaves as if the file never changed since the first run. I don't think this behaviour has anything to do with intuitive programming - if there's cache, it should be in that directory.

I am running the python directly from command line:

C:\programing\python\MyProject>py -2 main.py

Answer 1

Confusing errors of the form global name 'XXX' is not defined typically mean that you are shadowing a standard library module. You must rename your exceptions module.