import base64
def safe_base64_decode(s):
if len(s)%4!=0:
s=s+(4-len(s)%4)*"="
return base64.b64decode(s)
原来字符串还可以用乘法，学习了。
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木马
import base64
def safe_base64_decode(s):
if len(s)%4!=0:
s=s+(4-len(s)%4)*"="
return base64.b64decode(s)