I was reading the docs for PySimpbleGUI here:
https://pysimplegui.readthedocs.io/en/latest/#building-custom-windows
In the table of parameters for the Window() function for example the
icon parameter the meaning is Union[str, str] Can be either a filename
or Base64 value.
What is the usage of "Union". I don't recall seeing anything like it before.
Thanks, Jim
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