Pycsp3

PyCSP3 2.2, with new (control) structures 'If' and 'Match', new derivated constraint forms (Hamming, Exist, NotExist, ExactlyOne, AtLeastOne, AtMostOne and AllHold), new functions 'both' and 'either', auto-adjustment of array indexing, and the predefined named tuple 'Task'. See other extensions in Changelog Chapter of the complete [guide](https://arxiv.org/abs/2009.00326).

PyCSP3 2.1, with new versions of embedded solvers (ACE and Choco) and additional constraints (Precedence, BinPacking, Knapsack, MinimumArg, MaximumArg). See other extensions in Changelog Chapter of the complete [guide](https://arxiv.org/abs/2009.00326).

New functions allow us to pilot the solving process.
Everything you need to know about the interface of the library is described in a new chapter.
How to format data in filenames, to use default data and to load independent JSON data files (possibly from URLs) is explained in the guide.