如何从python解码编码消息答案

【问题标题】：How to decode encoded message from python如何从python解码编码消息
【发布时间】：2014-03-17 13:01:51
【问题描述】：

import base64
name = base64.b64decode('---boundary_177909_1c62465c-ca94-430f-95cb-04824165d0cf\r\nContent-Type: text/html; charset=utf-8\r\nContent-Transfer-Encoding: base64\r\n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\r\nCi9TaXplIDIwDQo+Pg0KDQpzdGFydHhyZWYNCjUwMTc1DQolJUVPRg0K\r\n\r\n----boundary_177910_c457e629-613b-4137-8d93-cf90400beda1--\r\n\r\n----boundary_177909_1c62465c-ca94-430f-95cb-04824165d0cf--\r\n\r\n\r\n')
print name

从 Python 中，我正在阅读我的 gmail 并获得像上面这样的编码消息。之后，我打算将其解码为普通的 HTML 或普通的文本。如果我在上面运行代码，那么我会收到类似TypeError: Incorrect padding 的错误不修改我的字符串（用 ( ) 括起来）如何获得结果。

谢谢，拉梅什。

【问题讨论】：

标签： base64 decode encode

【解决方案1】：

您不应该对收到的整个响应进行解码，因为它似乎包含发出---boundary_177909_... 的请求的边界。您需要解码的只是请求的主体，您需要先清理输入：

import base64


data = '---boundary_177909_1c62465c-ca94-430f-95cb-04824165d0cf\r\nContent-Type: text/html; charset=utf-8\r\nContent-Transfer-Encoding: base64\r\n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\r\nCi9TaXplIDIwDQo+Pg0KDQpzdGFydHhyZWYNCjUwMTc1DQolJUVPRg0K\r\n\r\n----boundary_177910_c457e629-613b-4137-8d93-cf90400beda1--\r\n\r\n----boundary_177909_1c62465c-ca94-430f-95cb-04824165d0cf--\r\n\r\n\r\n'

# Remove all characters until the start of the actual data
# 1. find the index in the string at which the 'base64' encodeing appears
index = data.find("base64")
# 2. remove all characters up to "base64"
data = data[index + len("base64"):]

# Remove all characters after the boundaries
index = data.find("-")
data = data[:index]

# Remove all new line/caret return characters
data = data.replace("\r\n", "").replace("\r\\n", "")

# Now that the data is cleaned we can decode it but first it needs to be padded
# see https://en.wikipedia.org/wiki/Base64#Output_padding for more details
# and https://stackoverflow.com/a/49459036/2003420 for the implementation
print base64.b64decode(data + b'=' * (-len(data) % 4))

【讨论】：