This commit fixes issue #558

Co-authored-by: Bu Sun Kim <8822365+busunkim96@users.noreply.github.com>

This change fixes a few error prone interactions with `str` and `bytes` type objects which surface as exceptions when the `googleapiclient` library tests are run with the `-bb` command line flag

See https://docs.python.org/3/using/cmdline.html#cmdoption-b

Co-authored-by: Kamil Breguła <mik-laj@users.noreply.github.com>
Co-authored-by: Christopher Wilcox <crwilcox@google.com>

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