初入 python

Posted 2020-11-09 yaoyuanecho

       python之道  优雅  明确  简单

英国发音：/?pa?θ?n/ 美国发音：/?pa?θɑ?n/）, 是一种面向对象的解释型计算机程序设计语言，由荷兰人Guido van Rossum于1989年发明，第一个公开发行版发行于1991年

import this 

Beautiful is better than ugly.
Explicit is better than implicit.
Simple is better than complex.
Complex is better than complicated.
Flat is better than nested.
Sparse is better than dense.
Readability counts.
Special cases aren‘t special enough to break the rules.
Although practicality beats purity.
Errors should never pass silently.
Unless explicitly silenced.
In the face of ambiguity, refuse the temptation to guess.
There should be one-- and preferably only one --obvious way to do it.
Although that way may not be obvious at first unless you‘re Dutch.
Now is better than never.
Although never is often better than *right* now.
If the implementation is hard to explain, it‘s a bad idea.
If the implementation is easy to explain, it may be a good idea.
Namespaces are one honking great idea -- let‘s do more of those!

1.编译型语言与解释型语言

 

 

            交互式命令行IDE

命名规则：变量名只能是 字母、数字或下划线的任意组合 第一个字符不能是数字

1. 变量名的长度不受限制，但其中的字符必须是字母、数字、或者下划线（_），而不能使用空格、连字符、标点符号、引号或其他字符。

2.变量名的第一个字符不能是数字，而必须是字母或下划线。

3.Python区分大小写。

4.不能将Python关键字用作变量名。

Python有五个标准的数据类型：

• Numbers（数字）
   
   
• String（字符串）
• List（列表）
• Tuple（元组）
• Dictionary（字典

 

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