How to use itertools Library in Python

Python itertools library how to use, many novices are not very clear about this, in order to help you solve this problem, the following editor will explain in detail for you, people with this need can come to learn, I hope you can gain something.

One Python module per week, this article mainly introduces: itertools library.

The functions provided by the itertools library are mainly inspired by functional programming languages such as Clojure, Haskell, APL and SML, which can use memory quickly and efficiently, and complex iteration-based algorithms. Based on iterator code, using the "lazy" processing model, you can reduce the exchange of large amounts of data and improve processing performance.

Merging and spliting iterators

Chain

Chain.from_iterable

Islice

Tee

Converting inputs

Starmap:*map, it's an interesting name.

Producing new values

Count: reminds me of natural numbers, but the function is not limited to natural numbers.

Cycle: keep turning in circles

Repeat: repeat

Filtering

Filterfalse

Dropwhile

Takewhile

Compress

Grouping data

Groupby: must first be sorted according to the specified key

Combining inputs

Accumulate: cumulative

Product: Cartesian product

Permutations: arranging

Combinations: combination

Combinations_with_replacement: take it into consideration

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