Anton Shestakov <av6@dwimlabs.net> [Wed, 13 Feb 2019 21:56:29 +0800] rev 4462
obsexchange: avoid importing io/StringIO module with a different name
Since we're not interested in the whole module, let's shorten the imports and
aviod the lint warnings.
Otherwise pep8-naming complains:
- import io as StringIO: N812 lowercase imported as non lowercase
- import StringIO as io: N813 camelcase imported as lowercase