pyodbc has not yet released Windows wheels for Python 3.9. In the meantime you can download a Python 3.9 wheel from
https://www.lfd.uci.edu/~gohlke/pythonlibs/#pyodbc
For the latest information on this issue see
It's written in open text
"Microsoft Visual C++ 14.0 is required"
. On PyPI website under pyodbc it reads
".....pyodbc contains C++ extensions so you will need a suitable C++ compiler on your computer to install pyodbc, for all operating systems."
I personally have installed Microsoft Visual 2015 C++ Redistributable. It weighs 23,5 Mb.
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