Never do this

Here’s a snippet of code to sneak into someone’s .pythonrc if you want them to hate you:

    import sys
    from numpy import *

    class Evil:
        size = array(1).itemsize
        __array_interface__ = {
            'shape' : (1,),
            'typestr' : '<i%d'%size,
            'data' : (id(1)+2*size, 0) }

    asarray(Evil())[0] = 2
    assert 1 == 2

It’s even platform independent! (Note: it will be less innocuous if the class isn’t named Evil.)