PyQt5 'QProcess' object has no attribute 'startCommand'

[kohei-noda-qcrg]

• This package installs qtpy and PySide6 automatically

• However, users who have already installed PyQt5, either manually or due to other package dependencies, will fail with the command to start the sum_dirac_dfcoef process.

  • It raises an attribute error because QProcess.startCommand is the new method from Qt 6 when a user uses PyQt5.

• qtpy uses PyQt5 as default unless users set QT_API environment variable to pyside6 or pyqt6.

• The following is the screenshot that shows this error.

[kohei-noda-qcrg]

• Here are my PySide and PyQt packages when the above error was displayed.

PS C:\Users\none> pip list | findstr "PySide PyQt"
PyQt5                   5.15.10
PyQt5-Qt5               5.15.2
PyQt5-sip               12.13.0
PyQt6                   6.7.0
PyQt6-Qt6               6.7.2
PyQt6-sip               13.6.0
PySide6                 6.6.3.1
PySide6_Addons          6.6.3.1
PySide6_Essentials      6.6.3.1

[kohei-noda-qcrg]

It seems that we no longer need to use qtpy. Because if we use the qtpy, we need to take care of deprecated and new attributes for all qt python bindings. It is painful to manage this, at least for us as a small project.