Python stands to lose its GIL, and gain a lot of speed(infoworld.com)

  for foo in iter(partial(data.get, "foo"), None):
      handle_foo(foo)

    import random
    def foo():
        return random.randrange(2)
    def bar():
        global w
        w = return random.randrange(20)
        return w
        
    while foo() or (bar() < 10):
        print(w)

    import re
    def parse_str(s):
        def m(pattern):  # I <3 Perl!
            nonlocal _
            _ = re.match(pattern, s)
            return _ is not None

        if m("Name: (.*)$"):
            return ("name", _[1])
        if m("State: (..) City: (.*)$"):
            return ("city", (_[2], _[1]))
        if m(r"ZIP: (\d{5})(-(\d{4}))?$"):
            return ("zip", _[1] + (_[2] if _[2] else ""))

        return ("Unknown", s)
        del _  # Remove this line and the function isn't valid Python(!)

    for line in (
            "Name: Ernest Hemingway",
            "State: FL City: Key West",
            "ZIP: 33040",
            ):
        print(parse_str(line))