Python资料之语言规则

变量定义的规则：
1、变量名只能是字母、数字或下划线的任意组合
2、变量名的第一个字符不能是数字
3、以下关键字不能声明为变量名：

["and","as","assert","break","class","continue","def","elif","else","except","exec","finally","for","from","global","if","import","in","ls","lambda","not","or","pass","print","raise","return","try","while","with","yield]

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python编码：
python2：声明字符集

# -*- coding:utf-8 -*-

python3：默认UTF-8处理

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python注释：

单行注释：使用#号注释

#注释信息

多行注释：使用三个单引号或者三个双引号

'''
 注释信息1
 注释信息2
 ... 
'''

"""
 注释信息1
 注释信息2
 ...
"""