pyjack 0.0.1

A way to hijack python methods and functions and attach callbacks or alter functionality.

The pyjack contains two basic functions – pyjack.connect and pyjack.disconnect – which allow you to connect to other functions and methods. This can be used to:

• attach observers or callbacks to functions/methods: Connect a callback ‘observer’ functions to be called whenever the pyjacked function is called. The callback is called with both the original arguments and the pyjacked function.

• filter function/method arguments: A filter function can be provided which is used to alter the arguments passed to the function.

• entirely replace existing function/method with your own function/method: pyjack allows you to ‘block’ the original function being called. In essence, this allows you to use pyjack to replace a function with your own callback (or filter) function.

Simple Example: Adding Callbacks To Functions

pyjack can be used to connect callbacks to functions:

import pyjack

def max_callback(input, pyjack_org_fn):
    print 'Someone is trying to max ' + str(input)
    print 'Also got some pyjack_org_fn ' + str(pyjack_org_fn)

pyjack.connect(max, callback = max_callback, filter = None, block = False)

print max([10, 20])

# When you are done, disconnect and everything is back to normal ...
pyjack.disconnect(max, callback = max_callback, filter = None, block = False)

More Uses

For more information …