Approximately two dozen types are built into the Python interpreter and grouped into a few major categories, as shown in Table 3.1. Some categories include familiar objects such as numbers and sequences. Others are used during program execution and are of little practical use to most programmers. The next few sections describe the most commonly used built-in types.
|Type Category||Type Name||Description|
|None||NoneType||The null object|
Floating-point numberComplex number
Unicode character string
Returned by xrange()