How python uses itertools

This article mainly introduces python how to use itertools, the article is very detailed, has a certain reference value, interested friends must read it!

Use itertools

Python's itertools module is a collection of tools for working with iterators. Itertools includes a variety of tools for generating iteratable results of input data. Take itertools.combinations () as an example. Itertools.combinations () is used to build the composition. These are possible combinations of inputs.

Give a real-life example to illustrate the above point:

Suppose there are four teams in a tournament, and in the league stage, each team has to play against every other team. The task is to list the possible combinations of all the competing teams.

The code is as follows:

Importitertools friends = ['Team 1,' Team 2, 'Team 3,' Team 4'] list (itertools.combinations (friends, ritual 2)) # [('Team 1,' Team 2'), ('Team 1,' Team 3'), ('Team 1,' Team 4'), ('Team 2,' Team 3'), ('Team 2,' Team 4'), ('Team 3,' Team 4')]

It is important to note that the order of values is not important. Because ('Team 1,' Team 2') and ('Team 2,' Team 1') represent the same pair, the output list needs to include only one of them. Similarly, you can use itertools.permutations () and other functions from the module.

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