Python类别-Set&删除方法？ [英] Python class - Set & Delete methods?

问题描述

首先，我想提一下，我是Python的新手，我发现从C ++过渡有点困难。

First I'd like to mention that I am completely new to Python and I've found it a bit difficult to transition from C++. I apologize if my question comes off as elementary.

我有一个针对歌曲的类，对此我进行了以下初始化。它从包含歌曲ID，名称，流派等文件的文件中获取数据，所有文件均由 :: 分隔。

I have a class for 'songs' which I have initialized as following. It takes in data from a file that contains a song's ID, name, genre etc. all separated by ::.

    def __init__(self):
            self.song_names = dict()
            self.song_genres = dict()

    def load_songs(self,  song_id):
            f = open(song_id)
            for line in f:
                    line = line.rstrip()
                    component = line.split("::")
                    sid = components[0]
                    same= components[1]
                    sgenre=components[2]
            self.song_names[mid] = sname
            self.song_genres[mid] = sgenre
            f.close()

该程序还从文件中获取数据带有用户信息，以
UserID :: Gender :: Age :: Occupation :: Zip 等分隔，并带有 ratings文件。

The program also takes in data from a file with 'users' information, separated as UserID::Gender::Age::Occupation::Zip etc. and a file with 'ratings'.

我会实现一个功能，例如 def set_song（sid，list（（title，genres）））
等等 delete_song（sid）吗？

I would I implement a function like def set_song(sid, list((title,genres))) and something like delete_song(sid) ?

我将不得不完成更多其他功能，但是如果有人可以帮助我这两个-至少对结构和语法有更好的了解-处理其他应该更容易。

I'm going to have to wind up doing a ton more other functions, but if someone could help me with those two - at least to have a better idea of structure and syntax - handling the others should be easier.

推荐答案

为什么不只是从字典继承并使用其接口？这样，您可以使用Python的标准映射操作来代替自己滚动：

Why not just inherit from dict and use its interface? That way you can use Python's standard mapping operations instead of rolling your own:

class Songs(dict):

    def load(self, song_id):
        with open(song_id, 'r') as f:
            for line in f:
                sid, name, genre = line.rstrip().split('::')[:3]
                self[sid] = [name, genre]

mysongs = Songs()
mysongs.load('barnes_and_barnes__fish_heads')
mysongs['barnes_and_barnes__fish_heads'] = ['roly poly', 'strange']  # set
del mysongs['barnes_and_barnes__fish_heads']                         # delete

这篇关于Python类别-Set&删除方法？的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！