python课堂上太多自我 [英] python too many self in class

问题描述

我正在学习Python OOP，并试图将Java类转换为Python类

I'm learning Python OOP and trying to convert a Java class to a Python class

有关Java代码，请参见此PDF文档的第15页google doc 链接

See page 15 in this PDF for Java code google doc link

class QuickFindUF:
        """docstring for QuickFindUF"""


    def __init__(self, n):
            self.id = []
            for e in range(n):
                    self.id.append(e)


    def connected(self,p,q):
            return self.id[p]==self.id[q]

    def union(self,p,q):
            self.pid = self.id[p]
            self.qid = self.id[q]
            for i in range(len(self.id)):
                    if(self.id[i]==self.pid):
                            self.id[i]=self.qid


quf = QuickFindUF(9)
quf.union(3,4)
print quf.connected(3,4)

此类中有16个 self 关键字.有没有更好的方法编写此类?

There are 16 self keywords in this class. Is there a better way to write this class?

推荐答案

是的，您不想将这些变量分配给 self ，这些是局部变量:

Yea, you don't want to assign these variables to self, these are local variables:

def union(self,p,q):
        self.pid = self.id[p]
        self.qid = self.id[q]
        for i in range(len(self.id)):
                if(self.id[i]==self.pid):
                        self.id[i]=self.qid

应该是:

def union(self,p,q):
    pid = self.id[p]
    qid = self.id[q]
    for i in range(len(self.id)):
        if self.id[i] == pid:
            self.id[i] = qid

仅在引用实例变量时使用 self ，而不是方法内部的任何变量.

You only use self when referring to instance variables, not to any variable inside of a method.

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