“模块名称”的含义

点击 here . 在代码的latt中。我无法理解“module\u name”。它从哪里来?“模块名称”的含义是什么?

def add_routes(app, module_name):
    n = module_name.rfind('.')
    if n == (-1):
        mod = __import__(module_name, globals(), locals())
    else:
        name = module_name[n+1:]
        mod = getattr(__import__(module_name[:n], globals(), locals(), [name]), name)
    for attr in dir(mod):
        if attr.startswith('_'):
            continue
        fn = getattr(mod, attr)
        if callable(fn):
            method = getattr(fn, '__method__', None)
            path = getattr(fn, '__route__', None)
            if method and path:
                add_route(app, fn)

class RequestHandler . 但我不知道这意味着什么。它让 类RequestHandler 变成一个模子?像这样的?

import RequestHandler