Python：Base64編碼解碼

import base64

s_raw = "中國人a"
b_raw = s_raw.encode() # S.encode(encoding='utf-8', errors='strict') -> bytes

b64 = base64.b64encode(b_raw)
print("b64", b64)
s64 = b64.decode()
print("s64", s64)


b = base64.b64decode(s64)
print("b", b)
s = b.decode("utf-8") 
print("s", s)

#輸出
""" b64 b'5Lit5Zu95Lq6YQ==' s64 5Lit5Zu95Lq6YQ== b b'\xe4\xb8\xad\xe5\x9b\xbd\xe4\xba\xbaa' s 中國人a """

b64encode和b64decode接收參數為bytes或ascii碼字符串，返回值為bytes。
字符串和bytes互相轉換有encode和decode方法，默認編碼為utf-8。