base64io
A stream implementation for Python that provides transparent base64
... two streams, but it assumes that you have two complete streams. We wanted a standard stream that applies Base64 encoding and decoding. :class:`base64io.Base64IO` provides an io streaming interface with context manager support that transparently Base64-encodes data read from it. You can use it to transform large files without caching the entire context in memory or to transform an existing stream.