7.13. Glossary


A variable used to count something. It’s usually initialized to zero and then incremented.

Empty String

A string with no characters and length 0, represented by two quotation marks.

Format Operator

An operator, %, that takes a format string and a tuple and generates a string that includes the elements of the tuple formatted as specified by the format string.

Format Sequence

A sequence of characters in a format string, like %d, that specifies how a value should be formatted.

Format String

A string, used with the format operator, that contains format sequences.


A boolean variable used to indicate whether a condition is true or false.


A statement that calls a method.


A property of sequences whose items cannot be reassigned.

String Index

An integer value used to select a character in a string.


One of the values in a sequence.


A function that is associated with an object and called using dot notation.

String Object

A string that a variable can refer to. For now, you can use “object” and “value” interchangeably.

A pattern of traversal that stops when it finds what it is looking for.


An ordered set; that is, a set of values where each value is identified by an integer index.


A part of a string specified by a range of indicies.


To iterate through the items in a sequence, performing a similar operation on each.

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