[FIXED] PyQtGraph opening then closing straight away

Issue

I'm running some basic code from the documentation

import pyqtgraph as pg
import numpy as np
x = np.arange(1000)
y = np.random.normal(size=(3, 1000))
plotWidget = pg.plot(title="Three plot curves")
for i in range(3):
    plotWidget.plot(x, y[i], pen=(i,3))

But for some reason the window open then closes straight away, i just see a flicker of it. Is there some sort of function in which i can keep the window open?

Solution

The problem is that the Python process finishes after the last iteration of the for loop and thus also terminates the widgets. You can use the -i switch in order to enter the interactive Python interpreter after executing the script which retains all objects that were instantiated during execution of the script:

python -i /path/to/script.py

Admittedly this is rather a workaround and pyqtgraph probably has a "native" way of achieving this (such as the show function from matplotlib.pyplot does it by default) however I couldn't find a similar function for pyqtgraph.

Answered By - a_guest