Python Essential Reference, Second Edition

Built-in Types

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.

Table 3.1. Built-in Python Types

Type Category	Type Name	Description
None	NoneType	The null object
Numbers	IntType LongType FloatType ComplexType	Integer Arbitrary-precision integer Floating-point number Complex number
Sequences	StringType UnicodeType ListType TupleType XRangeType BufferType	Character string Unicode character string List Tuple Returned by xrange()