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Added PPMA compression algrithm#14810

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Open

Added PPMA compression algrithm#14810
Nert53 wants to merge 4 commits into
TheAlgorithms:masterfrom
Nert53:compression/ppm

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@Nert53

@Nert53 Nert53 commented Jun 17, 2026

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Describe your change:

  • Add an algorithm?
  • Fix a bug or typo in an existing algorithm?
  • Add or change doctests? -- Note: Please avoid changing both code and tests in a single pull request.
  • Documentation change?

Checklist:

  • I have read CONTRIBUTING.md.
  • This pull request is all my own work -- I have not plagiarized.
  • I know that pull requests will not be merged if they fail the automated tests.
  • This PR only changes one algorithm file. To ease review, please open separate PRs for separate algorithms.
  • All new Python files are placed inside an existing directory.
  • All filenames are in all lowercase characters with no spaces or dashes.
  • All functions and variable names follow Python naming conventions.
  • All function parameters and return values are annotated with Python type hints.
  • All functions have doctests that pass the automated testing. -> Adding doctest to this is very chaotic, because outputs are very long even for short output.
  • All new algorithms include at least one URL that points to Wikipedia or another similar explanation.
  • If this pull request resolves one or more open issues then the description above includes the issue number(s) with a closing keyword: "Fixes #ISSUE-NUMBER".

@algorithms-keeper algorithms-keeper Bot added require tests Tests [doctest/unittest/pytest] are required require type hints https://docs.python.org/3/library/typing.html labels Jun 17, 2026

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@algorithms-keeper algorithms-keeper Bot added the awaiting reviews This PR is ready to be reviewed label Jun 17, 2026
@algorithms-keeper algorithms-keeper Bot removed the require type hints https://docs.python.org/3/library/typing.html label Jun 17, 2026

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Click here to look at the relevant links ⬇️

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Automated review generated by algorithms-keeper. If there's any problem regarding this review, please open an issue about it.

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algorithms-keeper actions can be triggered by commenting on this PR:

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  • @algorithms-keeper review-all to trigger the checks for all the pull request files, including the modified files. As we cannot post review comments on lines not part of the diff, this command will post all the messages in one comment.

NOTE: Commands are in beta and so this feature is restricted only to a member or owner of the organization.

Comment thread data_compression/ppma.py
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@algorithms-keeper algorithms-keeper Bot added require type hints https://docs.python.org/3/library/typing.html and removed require tests Tests [doctest/unittest/pytest] are required labels Jun 18, 2026

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Click here to look at the relevant links ⬇️

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Repository:

Python:

Automated review generated by algorithms-keeper. If there's any problem regarding this review, please open an issue about it.

algorithms-keeper commands and options

algorithms-keeper actions can be triggered by commenting on this PR:

  • @algorithms-keeper review to trigger the checks for only added pull request files
  • @algorithms-keeper review-all to trigger the checks for all the pull request files, including the modified files. As we cannot post review comments on lines not part of the diff, this command will post all the messages in one comment.

NOTE: Commands are in beta and so this feature is restricted only to a member or owner of the organization.

Comment thread data_compression/ppma.py
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@Nert53

Nert53 commented Jun 18, 2026

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In the last commit I added tests for the important methods in PPMA class.

@Nert53 Nert53 changed the title Compression/ppma Added PPMA compression algrithm Jun 18, 2026
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