每天动动脑，有利于身心健康！！！

import base64

def safe_base64_decode(s): s0=s s1=b'=' if(len(s)%4==0): n=0 else: n=4-len(s)%4 while(n): s0+=s1 n=n-1 print('%s==safe_base64_decode(%s)'%(s,base64.b64decode(s0)))

if name=='main': safe_base64_decode(b'YWJjZA==') safe_base64_decode(b'YWJjZA')