Python: static variable decorator

Question

I\'d like to create a decorator like below, but I can\'t seem to think of an implementation that works. I\'m starting to think it\'s not possible, but thought I would ask yo

Answer 1

You could do something like that (but I haven't tested this extensively; used CPython 2.6):

import types

def static(**dict):
    def doWrap(func):
        scope = func.func_globals
        scope.update(dict)
        return types.FunctionType(func.func_code, scope)
    return doWrap

# if foo() prints 43, then it's wrong
x = 42

@static(x = 0)
def foo():
   global x
   x += 1
   print(x)

foo() # => 1
foo() # => 2

It requires declaring those variables as global and shadows top-level global variables, but otherwise should work. Not sure about performance, though.