python中的base64模块

base64模块，不是加密算法，是用来将非ascll字符的数据转换成ascll字符的一种方法

A-Z，a-z，0-9，+ / 一共64个符号

import base64

var = b"This is the only way to the python peak road..."
var_encode = base64.b64encode(var)          #对二进制数据进行base64编码
print(var_encode,len(var_encode))


var_decode = base64.b64decode(var_encode)       #对编码过后的二进制数据进行解码，但是只能是同一种格式
print(var_decode)



var1 = b'https://translate.google.cn/#view=home&op=translate&sl=auto&tl=zh-CN&text=a%20bytes-like%20object%20is%20required%2C%20not%20'
url_encode = base64.urlsafe_b64encode(var1)         #对url进行bs64编码
print(url_encode)


url_decode = base64.urlsafe_b64decode(url_encode)       #对url进行bs64解码
print(url_decode)

运行结果

b'VGhpcyBpcyB0aGUgb25seSB3YXkgdG8gdGhlIHB5dGhvbiBwZWFrIHJvYWQuLi4=' 64
b'This is the only way to the python peak road...'
b'aHR0cHM6Ly90cmFuc2xhdGUuZ29vZ2xlLmNuLyN2aWV3PWhvbWUmb3A9dHJhbnNsYXRlJnNsPWF1dG8mdGw9emgtQ04mdGV4dD1hJTIwYnl0ZXMtbGlrZSUyMG9iamVjdCUyMGlzJTIwcmVxdWlyZWQlMkMlMjBub3QlMjA='
b'https://translate.google.cn/#view=home&op=translate&sl=auto&tl=zh-CN&text=a%20bytes-like%20object%20is%20required%2C%20not%20'

可以看到后面有等号=，这是上面原因，

数据长度%3 == 0,无

数据长度%3 == 1,2个==

数据长度%3 == 2,1个=

编码，解码，接收的是字节数据，返回的是字节数据