The way we use `InvalidQueryArgumentTypeError` is more akin to a `ValueError` than a `TypeError`. For example, we try to parse a string as an int, float, or date, but the parsing fails - there was nothing wrong with the type of the variable (string), but its contents were not parseable into the type we wanted - there was a problem with the value of the string.
This was a vestige from when we used to need the unittest2 library for pre-2.7
compatibility. Now that we require Python 2.7, we aren't using that library
and this indirection wasn't doing any good.
This reverts commit 9c41c39913.
That commit used byte strings for the `if __name__ == '__main__'` pattern,
which was necessary when we were doing unicode_literals. But it is wrong on
Python 3, and now that we're liberated from unicode_literals, we need to go
back to native strings for this comparison.
Include import of __future__ features division, absolute_imports and
print_function everywhere. Don't add unicode_literals yet for it is
harder to convert.
Goal is smoothing the transition to python 3.
