url编码 解码 百分号 %

from urllib.parse import quote,unquote

client_id = 'arn%3Aaws%3Aiam%3A%3A015428540659%3Auser%2Fs3'

client_id = unquote(client_id)
print(client_id)
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参考
https://www.csdn.net/tags/MtTaAgxsNDYyMTQ5LWJsb2cO0O0O.html