I was using appengine python appcfg.py to do a bulk download/upload of data 
from my datastore. Works great. I had all my data in csv file when I did a 
download_data. My entities have hashmap properties (serialized data on 
datastore) which are saved in a base64 encoding in the csvfile. 

appcfg.py by default has these import_transform: 
transform.blobproperty_from_base64 export_transform: base64.b64encode When 
we import the data, python code has magic to convert it into blob object. 

I would like to use the generated csv file and write some scripts to migrate 
data to MySQL at some point. Anyone has thoughts on how to read the binary 
data and recreate a hashmap object? Either java/python api?   

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