用于脚本转换的Python即时功能

Question

Is there a reasonably natural way of converting python function to standalone scripts? Something like:

def f(): 
    # some long and involved computation

script = function_to_script(f) # now script is some sort of closure, 
                               # which can be run in a separate process
                               # or even shipped over the network to a 
                               # different host

and NOT like:

script = open("script.py", "wt")
script.write("#!/usr/bin/env python")
...

Answer 1

You can turn any "object" into a function by defining the __call__ method on it (see here .) Hence, if you want to compartmentalize some state with the computations, as long as what you've provided from the very top to the bottom of a class can be pickled, then that object can be pickled.

class MyPickledFunction(object):
    def __init__(self, *state):
        self.__state = state

    def __call__(self, *args, **kwargs):
        #stuff in here

That's the easy cheater way. Why pickling? Anything that can be pickled can be sent to another process without fear. You're forming a "poor man's closure" by using an object like this.

(There's a nice post about the "marshal" library here on SO if you want to truly pickle a function.)