Maybe this helps. I use a PDF in the blobstore to attach a PDFand the GAE 
Python mail API. I do not need to create the multipart Mime message message 
myself.

message.to = 'john....@example.com'
message.body = 'message with a PDF attachment'       
attach_name = 'your_name'
blobs = blobstore.BlobInfo.gql("WHERE filename = '%s'" %(attach_name))     
   :
blob_key = blobs[0].key()                  
blob_reader = blobstore.BlobReader(blob_key)
attach_data = blob_reader.read()                # read from the blob
message.attachments=[(attach_name,attach_data)]

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