1. python是解释性语言，c语言是编译性语言

脚本解释性语言的内部机制
在运行脚本语言之前，得到结果之后
1.python先将脚本编译成字节码文件（pyc,pyo）
2.python虚拟机解释并运行字节码文件

编译性语言的内部机制
1.先将源代码编译成机器码（就是机器能读懂的代码），生成可执行文件
2.运行可执行文件

这就是为什么编译语言执行比解释性语言有效率

1. python（字节码）
2. 动态语义
3. 缩进

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!