PR: Add QT_VERSION
environment variable
#478
Open
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This PR adds the option to specify the Qt version qtpy will use via the
QT_VERSION
environment variable and should resolve #476.If the
QT_VERSTION
but not theQT_API
environment variable is set, theAPI
is selected based onQT_VERSTION
(and follows the usual orderPyQt5
->PySide2
->PyQt6
->PySide6
if a binding is not installed). If both environment variables are set,QT_API
takes precedence. If the version cannot be satisfied or the environment variables are incompatible warnings are triggered.Please have an extra eye on the test when reviewing as I am not perfectly sure it will behave correctly in the CI environment.