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PyPI · #3468 most downloaded on PyPI
Declarative parameters for robust Python classes and a rich API for reactive programming
Last release 9 days ago
25 Sep 2026
Release timing varies
gaps range from 8 days to 3 months
Nearly every release is documented
notes for 42 of 45 stable releases
Nothing withdrawn
no release was ever pulled
14 years old
133 releases · first in 2012
Fixed error messages for ClassSelector with tuple of classes
A full list of changes since the previous release is available here.
Added Range, Color, and Date parameters
A full list of changes since the previous release is available here.
One column per quarter.
Improved version reporting from version module
A full list of changes since the previous release is available here.
Selector parameters now respect order of options supplied
A full list of changes since the previous release is available on GitHub.
Added support for new ParamNB project
Added Unicode support for param.String.
A full list of changes since the previous release is available on GitHub.
Minor bugfix release to restore pre-1.3.0 script_repr behavior (accidentally changed in 1.3.0) and to fix issues with logging.
A full list of changes since the previous release is available on GitHub.
Added 'allow_None' support to all Parameters. Any subclass of Parameter that checks types and/or values should be modified to add appropriate handling
A full list of changes since the previous release is available on GitHub.
Minor bugfix release to fix issues with version when param is installed in a foreign git repository
A full list of changes since the previous release is available on GitHub.
Nothing published for this version
Added support for Python 3 (thanks to Marco Elver).
A full list of changes since the previous release is available on GitHub.
Switched to Python's own logging module.
A full list of changes since the previous release is available on GitHub.
Nothing published for this version
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