Python 在AWS SES中从content type=application/zip和base64编码解析文本文件

在amazon SES上，我有一个规则将传入的电子邮件保存到S3存储桶。Amazon以MIME格式保存这些文件

这些电子邮件的附件中有一个

.txt

，它将在MIME文件中显示为

content type=text/plain

，

content Disposition=attachment。txt

，和

内容传输编码=引用的可打印
或
bases64

我能够使用python很好地解析它

当压缩
.txt
文件附件时（即
内容类型：application/zip
），我在解码该附件的内容时遇到问题，好像编码不是
base64

我的代码：

import base64
s = unicode(base64.b64decode(attachment_content), "utf-8")

抛出错误：

Traceback (most recent call last):
  File "<input>", line 796, in <module>
UnicodeDecodeError: 'utf8' codec can't decode byte 0xcf in position 10: invalid continuation byte

我也尝试过使用“latin-1”，但会胡言乱语。
问题是，转换后，我处理的是一个压缩文件的格式，如“
PK\x03\x04\X3C\Xa\x0c…
”，在转换为UTF-8 unicode之前，我需要将其解压缩

这个代码对我有用：

import email

# Parse results from email
received_email = email.message_from_string(email_text)
for part in received_email.walk():
    c_type = part.get_content_type()
    c_enco = part.get('Content-Transfer-Encoding')

    attachment_content = part.get_payload()

    if c_enco == 'base64':
        import base64
        decoded_file = base64.b64decode(attachment_content)
        print("File decoded from base64")

        if c_type == "application/zip":
            from cStringIO import StringIO
            import zipfile
            zfp = zipfile.ZipFile(StringIO(decoded_file), "r")
            unzipped_list = zfp.open(zfp.namelist()[0]).readlines()
            decoded_file = "".join(unzipped_list)
            print('And un-zipped')

    result = unicode(decoded_file, "utf-8")

import email

# Parse results from email
received_email = email.message_from_string(email_text)
for part in received_email.walk():
    c_type = part.get_content_type()
    c_enco = part.get('Content-Transfer-Encoding')

    attachment_content = part.get_payload()

    if c_enco == 'base64':
        import base64
        decoded_file = base64.b64decode(attachment_content)
        print("File decoded from base64")

        if c_type == "application/zip":
            from cStringIO import StringIO
            import zipfile
            zfp = zipfile.ZipFile(StringIO(decoded_file), "r")
            unzipped_list = zfp.open(zfp.namelist()[0]).readlines()
            decoded_file = "".join(unzipped_list)
            print('And un-zipped')

    result = unicode(decoded_file, "utf-8")