Is there something about pyqtgraph that prevents python scripts using to be called by other programs?

[Brandon]

I have a python script that is working great. It takes in live data from a Qt C++ app, and displays it in the graph.

The problem is, I have to manually start the script. I cannot get the Qt app to start the script, I can't get other python scripts to start it. I have no means by which to automate it's opening for the end user. It will only run if I manually click on it or type in the command prompt for it. What is causing this?

import pyqtgraph as pg
from pyqtgraph.Qt import QtCore, QtGui
import numpy as np
import math
import socket

vis_socket = socket.socket()
host = socket.gethostname()
port = 5040

vis_socket.connect((host, port))

frame = 0
position = []

TIME_SIZE = 300

torque_mag = []
force_mag = []

main_window = pg.GraphicsWindow()
main_window.setWindowTitle('Bracelet Motion')

mag_labels = {"left":("Newtons"),"bottom":("Frames")}
magnitude_plot = main_window.addPlot()
magnitude_plot.setYRange(-5,50)
magnitude_plot.setLabel('left', 'Newtons')
magnitude_plot.setLabel('bottom', 'Number of Displayed Frames')
magnitude_plot.addLegend()
magnitude_plot.setTitle('Loadcell Magnitudes')
# plot2 = mainWindow.addPlot()

curve_f_mag = magnitude_plot.plot(force_mag, pen='g', name=' Force')
curve_tq_mag = magnitude_plot.plot(torque_mag, pen='r', name=' Torque')


def inc_frame():
    global frame, position
    if len(position) < TIME_SIZE:
        position.append(frame)
    # else:
    #     position[:-1] = position[1:]
    #     position[-1] = frame
        frame += 1

def plot_force_mag(data):
    # incFrame()
    global force_mag, curve_f_mag, position
    magnitude = calc_magnitude(data)
    if len(force_mag) < TIME_SIZE:
        force_mag.append(magnitude)  # build the list to desired size
    else:
        force_mag[:-1] = force_mag[1:]  # shift data in the array one sample left
        force_mag[-1] = magnitude  # set the last duplicate value to the new value
    curve_f_mag.setData(position, force_mag)

def plot_torque_mag(data):
    # incFrame()
    global torque_mag, curve_tq_mag, position
    magnitude = calc_magnitude(data)
    if len(torque_mag) < TIME_SIZE:
        torque_mag.append(magnitude)  # build the list to desired size
    else:
        torque_mag[:-1] = torque_mag[1:]  # shift data in the array one sample left
        torque_mag[-1] = magnitude  # set the last duplicate value to the new value
    curve_tq_mag.setData(position, torque_mag)
    # curveTqMag.setPos(frames, 0)

def calc_magnitude(data):
    val_x = float(data[0])
    val_y = float(data[1])
    val_z = float(data[2])
    return round(math.sqrt((val_x*val_x) + (val_y*val_y) + (val_z*val_z)),3)

def parse_data(data):
    data_list = data.split()
    if len(data_list) > 0:
        inc_frame()
    for d in data_list:
        i = data_list.index(d)
        # if d == "tipPos":
        #     getTipPos(dataList[i:i + 4])
        if d == "force":
            plot_force_mag(data_list[i+1 : i+4])
        if d == "torque":
            plot_torque_mag(data_list[i+1 : i+4])

def main():
    incoming = vis_socket.recv(8192).decode()
    stream_list = incoming.split(':')
    for chunk in stream_list:
        parse_data(chunk)

timer = pg.QtCore.QTimer()
timer.timeout.connect(main)
timer.start(50)

if __name__ == '__main__':
    import sys

    if (sys.flags.interactive != 1) or not hasattr(QtCore, 'PYQT_VERSION'):
        QtGui.QApplication.instance().exec_()

[vas...@gmail.com]

You should start the script with the command (or shortcut) 'python name_of_python_script.py', but you probably know that. Problem could be in multiple Qt instances (Qt app starts PyQt app, or similar), but I am not 100% sure what are you trying to do.
questions:
- Which operating system you are running?
- Which type of Qt App needs to start pyqtgraph app you provided?

- What is the graphic libraries you using with python app that couldn't start the script? Maybe you can try with:

import subprocess
subprocess.call(["python", "myscript.py"])

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