base64編碼規則:
24bit的二進制數
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分成4組,不足補\x00
每組編碼成1個位元組(用64個ASCII碼中的字元表示),總共4個位元組,不足補=
import base64
a = base64.b64encode(b'12Abc')
print (a)
print (str(a, 'utf-8'))
b = base64.b64decode(a)
print(b)
print (str(b, 'utf-8'))
運作結果:
b'MTJBYmM='
MTJBYmM=
b'12Abc'
12Abc
import base64
a = 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))
b'abcd++//'
b'abcd--__'
b'i\xb7\x1d\xfb\xef\xff'