Aggregate pattern: Difference between revisions

Revision as of 06:35, 2 September 2016

Revision as of 09:35, 22 January 2017

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return float(sum(g))/len(g) # In Python 3 the cast to float will no longer be necessary

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Python hides essentially all of the details using the [https://wwwdocs.python.org/doc3/liblibrary/typeiterstdtypes.html#iterator-types iterator protocol]. Confusingly, [[Design Patterns]] uses "aggregate" to refer to the blank in the code <code>for x in ___:</code> which is unrelated to the term "aggregation".<ref>[[Design Patterns]], p. 22: "Aggregation implies that one object owns or is responsible for another object. ... Aggregation implies that an aggregate object and its owner have identical lifetimes."</ref> Neither of these terms refer to the statistical aggregation of data such as the act of adding up the Fibonacci sequence or taking the average of a list of numbers.

== See also ==