9.16. Summary

for loop traversal (for)

Traversing a string or a list means accessing each character in the string or item in the list, one at a time. For example, the following for loop:

for ix in 'Example':

executes the body of the loop 7 times with different values of ix each time.


A function that produces a list of numbers. For example, range(5), produces a list of five numbers, starting with 0, [0, 1, 2, 3, 4].


A sequence of statements, or a style of coding something that has general applicability in a number of different situations. Part of becoming a mature programmer is to learn and establish the patterns and algorithms that form your toolkit.


A variable or value used to select a member of an ordered collection, such as a character from a string, or an element from a list.


To iterate through the elements of a collection, performing a similar operation on each.

accumulator pattern

A pattern where the program initializes an accumulator variable and then changes it during each iteration, accumulating a final result.

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