def reload(module, exclude=['sys', 'os.path', '__builtin__', '__main__']):
    """Recursively reload all modules used in the given module.  Optionally
    takes a list of modules to exclude from reloading.  The default exclude
    list contains sys, __main__, and __builtin__, to prevent, e.g., resetting
    display, exception, and io hooks.
    """
    global found_now
    for i in exclude:
        found_now[i] = 1
    try:
        with replace_import_hook(deep_import_hook):
            ret = deep_reload_hook(module)
    finally:
        found_now = {}
    return ret