在Python中base64编码/解码上有额外的新行吗？

Question

我编写了以下实用程序函数：

import base64

def der2str(der):
    return bin2str( base64.encodebytes(der) )

def str2der(str_):
    return base64.b64decode( str2bin(str_) )

def bin2str(binary):
    return binary.decode('utf8')

def str2bin(str_):
    return str_.encode('utf8')

我运行的程序是：

if __name__ == '__main__':
    test = 'MIIEowIBAAKCAQEA6cVU+6GZyr1jaxvJcLEdRb9cicL/4Soe/HqN+gE/UdM5C71aG6HhNSplj1qi\nX8Abffen'
    print(test)
    print(der2str(str2der(test)))

但结果是：

MIIEowIBAAKCAQEA6cVU+6GZyr1jaxvJcLEdRb9cicL/4Soe/HqN+gE/UdM5C71aG6HhNSplj1qi
X8Abffen
MIIEowIBAAKCAQEA6cVU+6GZyr1jaxvJcLEdRb9cicL/4Soe/HqN+gE/UdM5C71aG6HhNSplj1qi
X8Abffen

为什么我要在第二次打印时多打印两行

[编辑]
根据标记的答案，只要输入字符串test不包含任何'\n'，就可以使用return bin2str( base64.b64encode(der) )

如果有人需要换行符，那么字符串必须以'\n'结尾，断言assert(test == der2str(str2der(test)))才能通过

Answer 1

base64.encodebytes(s)的文档声明它插入了换行符

Encode the bytes-like object s, which can contain arbitrary binary data, and return bytes containing the base64-encoded data, with newlines (b'\n') inserted after every 76 bytes of output, and ensuring that there is a trailing newline, as per RFC 2045 (MIME).

您可能想改用base64.b64encode