Python 3 - Second Edition

12.2    Operations on Instances of Sequential Data Types

The following operations are defined for all sequential data types (s and t are instances of the same sequential data type; i, j, k, and n are integers; and x is a reference to an instance; see Table 12.2).

Notation	Description	Section
x in s	Checks whether x is contained in s. The result is a truth value.	Section 12.2.1
x not in s	Checks if x is not contained in s. The result is a bool instance. Equivalent to not x in s.	Section 12.2.1
s + t	The result is a new sequence containing the concatenation of s and t.	Section 12.2.2
s += t	Creates the concatenation of s and t and assigns it to s.	Section 12.2.2
s * n or n * s	Returns a new sequence ...