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      Python变量是指针吗?否则,它们是什么?

      Are Python variables pointers? Or else, what are they?(Python变量是指针吗?否则,它们是什么?)
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              1. 本文介绍了Python变量是指针吗?否则,它们是什么?的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着跟版网的小编来一起学习吧!

                问题描述

                据我所知,Python中的变量只是指针。

                根据此规则,我可以假定此代码片段的结果为:

                i = 5
                j = i
                j = 3
                print(i)
                

                将是3

                但是我得到了一个意外的结果,结果是5

                此外,我的Python书确实介绍了这个示例:

                i = [1,2,3]
                j = i
                i[0] = 5
                print(j)
                

                结果将是[5,2,3]

                我理解错误的地方是什么?

                推荐答案

                我们称它们为引用。他们是这样工作的

                i = 5     # create int(5) instance, bind it to i
                j = i     # bind j to the same int as i
                j = 3     # create int(3) instance, bind it to j
                print i   # i still bound to the int(5), j bound to the int(3)
                

                小整数被扣留,但这对此解释并不重要

                i = [1,2,3]   # create the list instance, and bind it to i
                j = i         # bind j to the same list as i
                i[0] = 5      # change the first item of i
                print j       # j is still bound to the same list as i
                

                这篇关于Python变量是指针吗?否则,它们是什么?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跟版网!

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