monkeypatching - Overriding len in __init__.py - python -

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i assign function len in __init__.py file of package following way:

llen = len len = lambda x: llen(x) - 1

it works fine, in __init__.py file. how can make affect other modules in package?

when try load name not defined module-level global or function local, python looks in __builtin__(builtins in python 3) module. in both versions of python, module availabe __builtins__ in global scope. can modify module , this affect not code python code anywhere runs after code runs!!

import __builtin__ builtins # import builtins in python 3 llen = len builtins.len = lambda a:llen(a) - 1

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