Python3基础 tuple(list) 改变list元素的内容时,元组的id值不变

  • Python : 3.7.3
  • OS : Ubuntu 18.04.2 LTS
  • IDE : pycharm-community-2019.1.3
  • Conda : 4.7.5
  • *typesetting : Markdown

code

coder@ubuntu:~$ source activate py37
(py37) coder@ubuntu:~$ ipython
Python 3.7.3 (default, Mar 27 2019, 22:11:17)
Type 'copyright', 'credits' or 'license' for more information
IPython 7.5.0 -- An enhanced Interactive Python. Type '?' for help.

In [1]: a = (1, 2, [4, 5])  # index=2的元素是list类型

In [2]: type(a), id(a)
Out[2]: (tuple, 140524432415480)

In [3]: a[2].append(6)  # 改变index=2的list类型的元素的值

In [4]: a
Out[4]: (1, 2, [4, 5, 6])

In [5]: type(a), id(a)  # id(a)的值竟然无变化
Out[5]: (tuple, 140524432415480)

In [6]: exit
(py37) coder@ubuntu:~$ conda deactivate
coder@ubuntu:~$

source_code

def id(*args, **kwargs): # real signature unknown
"""
    Return the identity of an object.

    This is guaranteed to be unique among simultaneously existing objects.

    (CPython uses the object's memory address.)
"""
    pass

reference

resource

  • [文档 – English] docs.python.org/3
  • [文档 – 中文] docs.python.org/zh-cn/3
  • [规范] www.python.org/dev/peps/pep-0008
  • [规范] zh-google-styleguide.readthedocs.io/en/latest/google-python-styleguide/python_language_rules
  • [源码] www.python.org/downloads/source
  • [ PEP ] www.python.org/dev/peps
  • [平台] www.cnblogs.com
  • [平台] gitee.com

Python具有开源、跨平台、解释型、交互式等特性,值得学习。
Python的设计哲学:优雅,明确,简单。提倡用一种方法,最好是只有一种方法来做一件事。
代码的书写要遵守规范,这样有助于沟通和理解。
每种语言都有自己独特的思维,初学者需要转变思维、练习思维、坚持积累。

[En]

Each language has its own unique thinking, and beginners need to change their thinking, practice it and persist in accumulation.

Original: https://www.cnblogs.com/xingchuxin/p/11144149.html
Author: 行初心
Title: Python3基础 tuple(list) 改变list元素的内容时,元组的id值不变

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