Python built-in module: base64

Base64 Encoding Rules:

Binary number of 24bit

|

Divided into 4 groups, insufficient to complement \x00

|

Each group is encoded in 1 bytes (denoted by a character in 64 ASCII codes), a total of 4 bytes, and insufficient compensation =

import base64a = base64.b64encode (b ' 12ABC ') print  (a) print  (str (a,  ' utf-8 ')) b  = base64.b64decode (a) print (b) print  (str (b,  ' utf-8 ')) 

Operation Result:

B ' mtjbymm= ' mtjbymm=b ' 12ABC ' 12ABC

However, there may be a ' + ' or ' \ ' number after encoding, which is not allowed in the URL, so it needs to be converted via the URL safe: +----_

Import base64a = Base64.b64encode (b ' I\xb7\x1d\xfb\xef\xff ') print (a) c = Base64.urlsafe_b64encode (b ' i\xb7\x1d\xfb\xef \xff ') print (c) Print (Base64.urlsafe_b64decode (c))

Operation Result:

B ' abcd++//' B ' abcd--__ ' B ' i\xb7\x1d\xfb\xef\xff '

Python built-in module: base64