howto load and unload a module

[Guy Robinson]

Hello,

I have a directory of python scripts that all (should) contain a number of 
attributes and methods of the same name.

I need to import each module, test for these items and unload the module. I have 
2 questions.

1.. How do unload an imported module?
2.. how do I test for the existance of a method in a module without running it?

TIA,

Guy