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Add Base62 encoding and decoding algorithm. #14222

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Add Base62 encoding and decoding algorithm. #14222

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@frangelbarrera frangelbarrera commented Jan 28, 2026

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.
  • 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".

Description

This PR adds the Base62 encoding and decoding algorithm. Base62 is a positional numeral system that uses 62 as its base, consisting of alphanumeric characters (0-9, a-z, A-Z). It is widely used for URL shortening and generating compact, human-readable identifiers.

Reference: Base62 - Wikipedia

@algorithms-keeper algorithms-keeper bot added the awaiting reviews This PR is ready to be reviewed label Jan 28, 2026
@algorithms-keeper algorithms-keeper bot added the tests are failing Do not merge until tests pass label Jan 28, 2026
@frangelbarrera
Remove redundant doctest import
2d75b1d 
Removed redundant import of doctest from main block.
@frangelbarrera
Update base62.py
c5c9572
@frangelbarrera
Refactor base62 functions and add tests
ec9a062 
Refactor base62 encoding and decoding functions to use a local charset variable instead of a global CHARSET. Added a test function for base62 encoding and decoding.
@algorithms-keeper algorithms-keeper bot removed the tests are failing Do not merge until tests pass label Jan 28, 2026
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@mindaugl mindaugl mindaugl approved these changes

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@frangelbarrera @mindaugl