Poor man's nailgun, for when some imports are stupid slow

nailgun.py

# Other code goes here
def run():
    pass
    # ...

def main():
    global nailgun

    while True:
        try:
            nailgun = importlib.reload(nailgun)
        except ImportError as e:
            print("ImportError: {}".format(e))
            print("Hit enter to reload")
            input()
            continue

        try:
            nailgun.run()
        except Exception as e:
            print(repr(e))
            print("Caught exception in run: {}".format(e))
        print("Hit enter to reload/rerun")
        input()


if __name__ == "__main__":
    main()