Hi @nael
You don’t actually need a separate installation of Qt. When you install PyQt5/PySide2 the binary libraries are installed alongside the Python code. See below for example of PySide2 install folder on Windows, the .dll
files are the Qt5 libraries.
Directory of C:\Users\Gebruiker\AppData\Local\Programs\Python\Python37\Lib\site-packages\PySide2
28/01/2020 13:51 <DIR> .
28/01/2020 13:51 <DIR> ..
28/01/2020 13:51 4,173,928 d3dcompiler_47.dll
28/01/2020 13:51 589,432 designer.exe
28/01/2020 13:51 <DIR> examples
28/01/2020 13:51 <DIR> glue
28/01/2020 13:51 <DIR> include
28/01/2020 13:51 207,992 lconvert.exe
28/01/2020 13:51 23,672 libEGL.dll
28/01/2020 13:51 3,573,880 libGLESv2.dll
28/01/2020 13:51 1,326,200 linguist.exe
28/01/2020 13:51 219,256 lrelease.exe
28/01/2020 13:51 567,416 lupdate.exe
28/01/2020 13:51 20,923,392 opengl32sw.dll
28/01/2020 13:51 <DIR> plugins
28/01/2020 13:51 134,144 pyside2-lupdate.exe
28/01/2020 13:51 144,896 pyside2.abi3.dll
28/01/2020 13:51 44,812 pyside2.abi3.lib
28/01/2020 13:51 <DIR> qml
28/01/2020 13:51 21 qt.conf
28/01/2020 13:51 235,008 Qt3DAnimation.pyd
28/01/2020 13:51 18,524 Qt3DAnimation.pyi
28/01/2020 13:51 261,120 Qt3DCore.pyd
28/01/2020 13:51 22,114 Qt3DCore.pyi
28/01/2020 13:51 465,408 Qt3DExtras.pyd
28/01/2020 13:51 34,759 Qt3DExtras.pyi
28/01/2020 13:51 225,792 Qt3DInput.pyd
28/01/2020 13:51 17,554 Qt3DInput.pyi
28/01/2020 13:51 52,224 Qt3DLogic.pyd
28/01/2020 13:51 2,867 Qt3DLogic.pyi
28/01/2020 13:51 1,107,456 Qt3DRender.pyd
28/01/2020 13:51 152,136 Qt3DRender.pyi
28/01/2020 13:51 419,960 Qt53DAnimation.dll
28/01/2020 13:51 383,608 Qt53DCore.dll
28/01/2020 13:51 628,344 Qt53DExtras.dll
28/01/2020 13:51 375,416 Qt53DInput.dll
28/01/2020 13:51 50,808 Qt53DLogic.dll
28/01/2020 13:51 172,664 Qt53DQuick.dll
28/01/2020 13:51 54,904 Qt53DQuickAnimation.dll
28/01/2020 13:51 76,408 Qt53DQuickExtras.dll
28/01/2020 13:51 51,832 Qt53DQuickInput.dll
<snip>
You can install a separate installation of Qt if you want access to the tools (Qt Designer, Qt Creator, etc.) But this installation won’t affect your Python versions.