Return a human-oriented string name of the
dtypearg. This can be use by astropy methods that present type information about a data object.
The output is mostly equivalent to
dtype.namewhich takes the form <type_name>[B] where <type_name> is like
booland [B] is an optional number of bits which gets included only for numeric types.
For bytes, string and unicode types, the output is shown below, where <N> is the number of characters. This representation corresponds to the Python type that matches the dtype:
Numpy S<N> U<N> Python bytes<N> str<N>