在Python上使用app.route循环

Question

I'm trying to create several URLs on my serv thanks to a loop . The issue is that each function I create in a app.route can't have the same name than the others . And I don't know how to create different function names ... Here is the code :

json_tweets = []

for line in open('C:\Users\Benjamin\Desktop\DashboardProject\last_rated_set.json',"r"):
    json_tweets.append(json.loads(line,"ISO-8859-1"))

cashtag_tab = []  

for tweet in json_tweets:
    if not(tweet['cashtag'] in cashtag_tab) :
        cashtag_tab.append(tweet['cashtag'])        

for i in range(0,(len(cashtag_tab)-1)) :
    var=cashtag_tab[i]
    @app.route("/"+var)
    def company(var) :
        finance=Share(var)
        datas =  finance.get_historical('2014-01-01', '2014-12-31')
        datas = json.dumps(datas, default=json_util.default)    
        return datas

I'm getting the error AssertionError : View function mapping is overwritting an existing endpoint function : company

Answer 1

This fails because Flask derives the endpoint name from the function by default, but it would anyway fail later because the function company requires an argument var and the route is not parameterised. The simplest option would be just checking the value inside the handler:

@api.route('/<var>')
def company(var):
    if var not in cashtag_tab:
        abort(404)

If you want all the routes to be in the routing map for any reason, I once needed a similar thing and came up with something like this:

def url_family(source, methods=('GET',)):
    def decorator(f):
        for entry in source:
            # create a handler that delegates to your function
            def view_func(entry=entry, **kwargs):
                return f(entry, **kwargs)

            endpoint = '{0}_{1}'.format(f.__name__, entry)
            url = '/{0}'.format(entry)

            api.add_url_rule(url, 
                             methods=methods,
                             endpoint=endpoint,
                             view_func=view_func)

    return decorator

Then you register the handlers as:

@url_family(cashtag_tab)
def company(var):
    ...

Answer 2

Assuming that you are using flask now, you should consider Custom URL Converter. Check links below

http://flask.pocoo.org/docs/0.10/api/#flask.Flask.url_map - url_map UrlConverter API https://exploreflask.com/views.html#url-converters - example url converter https://stackoverflow.com/a/5872904/3451543 - RegexConverter by Philip Southam

Anyway, specifying more details on your question is always helpful to get accurate answer :)