A WHL file is a package saved in the Wheel format, which is the standard built-package format used for Python distributions. It contains all the files for a Python install and metadata, which includes the version of the wheel implementation and specification used to package it.
The Wheel format was introduced in PEP 427, which is a Python Enhancement Proposal authored by Daniel Holth and accepted in 2012. It was developed as a quicker and more reliable method of installing Python software than re-building from source code every time. WHL files only have to be moved to the correct location on the target system to be installed, whereas a source distribution requires a build step before installation.
References:
https://fileinfo.com/extension/whl#:~:text=A%20WHL%20file%20is%20a,specification%20used%20to%20package%20it.
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