Categories in Python

gistfile1.py

# categories.py

class category(object):
    def __init__(self, mainModule, override = True):
        self.mainModule = mainModule
        self.override = override
        
    def __call__(self, function):
        if self.override or function.__name__ not in dir(self.mainModule):
            setattr(self.mainModule, function.__name__, function)
            
def categorize(module, function):
    category(module).__call__(function)

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# categories_test.py

import this
from categories import category

@category(this)
def all():
    print "all things are this"
    
this.all()