Hi All,
I have recently started using Python and pyqtgraph so apologies for a
rather basic question. I am trying to read some data from a file and plot
it using pyqtgraph (as given in the code below). All the plot
initialization is done in the main function and then the plot is updated
through a QTimer. However, when I try to run this code, it returns the
error:
QtGui.QApplication.instance().exec_()
AttributeError: 'NoneType' object has no attribute 'exec_'
Any help with this would be much appreciated.
Thanks.
import multiprocessing
import numpy as np
import sys
import pyqtgraph as pg
from pyqtgraph.Qt import QtCore, QtGui
import ReadData
def main():
matrix_main = np.memmap('myData.dat', dtype='float64', mode='w+',
shape=(5000, 5))
p = multiprocessing.Process(target=ReadData.worker)
p.start()
win1 = pg.GraphicsWindow()
win1.setWindowTitle('Data plot')
p1 = win1.addPlot()
index = int(matrix_main[0, 0])
curve1 = p1.plot(matrix_main[:index, 2], pen='k')
pg.QtGui.QApplication.processEvents()
timer = pg.QtCore.QTimer()
timer.timeout.connect(update1)
timer.start(1000)
def update1():
global curve1, matrix_main
index = int(matrix_main[0, 0])
curve1.setData(matrix_main[:index, 2])
if __name__ == '__main__':
if (sys.flags.interactive != 1) or not hasattr(QtCore, 'PYQT_VERSION'):
QtGui.QApplication.instance().exec_()
main()
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