Install Python 3.10.x or newer. Download the latest Windows 10 64-bit installer from python.org
pip install pyfltk
FLTK C++ documentation has excellent documentation which is easy to read and understand for python.
Download the full C++ FLTK 1.3.7 docs below:
Get FLTK C++ docsExtract the tar.gz file with the popular 7-zip software. A tar.gz file is a compressed archive. You will have to extract it twice. The first extraction will produce the tar file. Then extract the tar file again with 7-zip. Then go into the html directory and open the index.html file with a browser. Bookmark this page as you will be refering to it often. It should look similar to this
After installing pyFltk then the python specific documentation and test programs will be located in directories,
C:\Program Files\Python39\Lib\site-packages\fltk\test
C:\Program Files\Python39\Lib\site-packages\fltk\docs