Tail call optimizer

Hey /prog/
Check out my tail call decorator for Python.

def tailcall(f):
    '''Decorator that implements tail call optimization.
    Supports cooperative tail call - even when only one of the functions
    is decorated, and all exceptions pass through it. You can tell the
    functions that have been tail optimized because they have "tco" before
    them in the stack frame.
    The only caveat is that if you attempt to decorate a function that
    isn't called in a tail recursive fashion from another decorated
    function, you'll get wrong results.'''
   
    tdata = [False] #[Optimizing?]
    DO_CALL = object() #Call marker
    def tco(*a, **aa):
        if tdata[0]:
            return DO_CALL, a, aa
        else:
            tdata[0] = True
            ret = f(*a, **aa)
            while type(ret) is tuple and ret and ret[0] is DO_CALL:
                ret = f(*ret[1], **ret[2])
            tdata[0] = False
            return ret
    tco.__doc__ = f.__doc__
    return tco

ONE WORD, FORCED INDENTATION OF THE CODE, THREAD OVER

@tailcall is a meme now?

>>1
Lol, my code is already being distributed, it's a success!

>>4
You should post this on programming.reddit.

O^® EN

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