The type of file object returned by the open() function
depends on the mode. When open() is used to open a file in a text
mode ('w', 'r', 'wt', 'rt', etc.), it returns a subclass of
io.TextIOBase (specifically io.TextIOWrapper). When used
to open a file in a binary mode with buffering, the returned class is a
subclass of io.BufferedIOBase. The exact class varies: in read
binary mode, it returns an io.BufferedReader; in write binary and
append binary modes, it returns an io.BufferedWriter, and in
read/write mode, it returns an io.BufferedRandom. When buffering is
disabled, the raw stream, a subclass of io.RawIOBase,
io.FileIO, is returned.
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