[mcstas-users] help!--AttributeError: module 'pyqtgraph.Qt.QtGui' has no attribute 'QApplication'

曾智蓉 zengzr at ihep.ac.cn
Tue Nov 1 03:21:53 CET 2022


I'm using McStas to simulate the instrument. I uninstalled my old version of McStas and installed the version 2.7.1. But there is a problem with the 'plot' function. I can't use it. Error prompt always pops up when compiling. The error is as following:

 'mcplot-pyqtgraph C:\mcstas-2.7.1\source_test\13b20220704_20221031_165658

 loading system configuration

 mcplot error: module 'pyqtgraph.Qt.QtGui' has no attribute 'QApplication'

 Traceback (most recent call last):

 File "C:\\mcstas-2.7.1\\lib\\tools\\Python\\mcplot\\pyqtgraph\\mcplot.py", line 67, in <module>


 File "C:\\mcstas-2.7.1\\lib\\tools\\Python\\mcplot\\pyqtgraph\\mcplot.py", line 57, in main

 raise e

 File "C:\\mcstas-2.7.1\\lib\\tools\\Python\\mcplot\\pyqtgraph\\mcplot.py", line 49, in main

 plotter = pqtgfrontend.McPyqtgraphPlotter(graph, sourcedir=loader.directory, plot_func=plotfuncs.plot, invcanvas=args.invcanvas)

 File "C:\mcstas-2.7.1\lib\tools\Python\mcplot\pyqtgraph\..\..\mccodelib\pqtgfrontend.py", line 46, in __init__

 self.app = QtGui.QApplication(sys.argv)

 AttributeError: module 'pyqtgraph.Qt.QtGui' has no attribute 'QApplication''

Can you give me some advice on how to solve this problem?

Best regards,

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