[Django]-In-memory thumbnail generation in python

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You can save it to a StringIO object instead of a file (use the cStringIO module, if possible):

from StringIO import StringIO

fake_file = StringIO()
thing.save(fake_file)  # Acts like a file handle
contents = fake_file.getvalue()
fake_file.close()

Or if you like context managers:

import contextlib
from StringIO import StringIO

with contextlib.closing(StringIO()) as handle:
    thing.save(handle)
    contents = handle.getvalue()
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