/assign

A Black Magic for support obj.__assign__ method'

Primary LanguagePython

Assign

assign is a black magic module for supporting obj.__assign__:

How to use it:

1. magic patch

Suppose that there is a test.py

a = 1


class T():
    def __assign__(self, v):
        print('called with %s' % v)


b = T()
c = b

It just works as:

Python 3.6.0 (default, Mar  6 2017, 15:44:48)
[GCC 4.2.1 Compatible Apple LLVM 8.0.0 (clang-800.0.42.1)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>> import magic
>>> import test
called with c

2. manually patch

from assign.patch import patch_module
import test

patch_module(test)

Install

just:

pip install assign

Notes

  • Tested with Py2.7 and Py3.6

Known Issues

    1. Won't work under REPL
    1. May slow import operation.
    1. May failed when patch some modules like os and sys