The most significant user-visible differences between the two are in
the representations of binary data and textual data. For Python 3,
-binary data stored using the `bytes` type, and textual data is stored
+binary data is stored using the `bytes` type, and textual data is stored
using the `str` type. For Python 2, binary data is stored using the
`str` type, and textual data can use the `str` or `unicode` types.
Because there is a single source tree, the documentation will refer to