optimization

[Duncan Booth]

Steven D'Aprano <steve at REMOVE-THIS-cybersource.com.au> wrote:

> Which makes me wonder, is there anything we can do with that code object 
> from Python code? I can disassemble it:
> 
>>>> import dis
>>>> dis.dis(outer.func_code.co_consts[1])
>   3           0 LOAD_CONST               0 (None)
>               3 RETURN_VALUE
> 
> Anything else?

Provided it doesn't take any arguments you can run the code with exec or 
eval:

>>> def outer():
    def inner():
            print "inner called"
    return inner()

>>> eval(outer.func_code.co_consts[1])
inner called

More usefully you could use the code object to construct another function, 
e.g. if you wanted to change the values of some default arguments.

>>> types.FunctionType(outer.func_code.co_consts[1], globals())()
inner called


-- 
Duncan Booth http://kupuguy.blogspot.com