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Events

from decorated import event

upload_event = event(('filename', 'data'))

@upload_event
def upload(filename, data):
    print('saving ...')
    
@upload_event.before
def before_upload(data):
    print('received %d bytes' % len(data))
    
@upload_event.after
def after_upload(filename):
    print('saved as %s' % filename)
    
upload('aaa.txt', '!@#$%^&*()')

In a large system, the functions are usually defined in different modules and loosely coupled by events. If functions are located in different modules, make sure you load those modules before calling the upload function. Alternatively, you can call events.init('your_package_name') to do this for you.