Python继承__init__混乱

Question

I am using python 2.7 and confused about inheritance concept.

I want to make a script that can download from various manga (japanese comic site)

Every manga site uses a different method to save their file. So i have a "Manga_site" class and class called "mangacanblog" (this is a website manga).

Every manga site has a: homepage,collection,page,etc. and it's all different for each site. my question is. is this script correct to store those homepage,collection_page,etc variable? or should I use self.homepage in mangacanblog class and not in the Manga_site class?

class Manga_site:

    def __init__(self,homepage,collection_page,base_manga_page,manga_title = ""):
        self.homepage = homepage
        self.collection_page = collection_page
        self.base_manga_page = base_manga_page
        self.manga_title = manga_title


class Mangacanblog(Manga_site):

    def __init__(self,manga_title):
        homepage = bloglink
        collection_page = collectionpagelink
        manga_title = manga_title.lower()
        base_manga_page = basepagelink

Answer 1

In your Mangacanblog 's __init__() function you are just setting local variables homepage , collection_page , etc, not instance variables, to make them instance variables you have to use self. , and this needs to be used in both super class as well as subclass.

But a better thing to do would be to call super(Manga_site).__init__() to let the super class handle its initialization, and then you can initialize sub class just the way you want to.

But for this, you would need to define Manga_site as a new style class, by inheriting from object class. Example -

class Manga_site(object):

    def __init__(self,homepage,collection_page,base_manga_page,manga_title = ""):
        self.homepage = homepage
        self.collection_page = collection_page
        self.base_manga_page = base_manga_page
        self.manga_title = manga_title


class Mangacanblog(Manga_site):

    def __init__(self,manga_title):
        super(Mangacanblog, self).__init__(bloglink, collectionpagelink, basepagelink, manga_title.lower())

I have guessing you would define bloglink and collectionpagelink , before you use them in the subclass.

---

But this given, from the example you have given, what you are trying to achieve may be to use objects of class, and not inheritence.

Inheritence is used when the subclass has extra attributes/properties and extra methods.

You create different objects of same class if you want to store different data in them. Example -

class Manga_site:

    def __init__(self,homepage,collection_page,base_manga_page,manga_title = ""):
        self.homepage = homepage
        self.collection_page = collection_page
        self.base_manga_page = base_manga_page
        self.manga_title = manga_title

mangacanblog = Manga_site('<homepage url>','<collection_page>',....)
anothermangasite = Manga_site('<another url>',....)

Then you can use these objects anyway you want to.