Py5 App Hangs When Using py5-run-sketch with subprocess

[vsquared]

The following demo creates a source code launcher using subprocess. When 'python3' is used with subprocess the app runs as expected. When 'py5-run-sketch' is used with subprocess the app hangs and must be Force Quit on a Mac. To aid in testing, sample files for both cases follow the demo. You should be able to run the python3 example files in succession without error. The py5-run-sketch example code allows only one run; the app hangs and must be Force Quit in order to continue. py5-run-sketch is an executable file and I am unable to find the source code in an attempt to find an explanation for this behavior.

import javafx
import subprocess
import os

_wndW = 500
_wndH = 280

def cBox1Action(event):
  global cBox1,cBox2,cmdFld,fileFld
  if(cBox1.isSelected):
    cmdFld.setText("python3 ")
    cBox2.setSelected(False)
  
def cBox2Action(event):
  global cBox1,cBox2,cmdFld,fileFld
  if(cBox2.isSelected):
    cmdFld.setText("py5-run-sketch ")
    cBox1.setSelected(False)
  
def quitBtnAction(event):
  global stage
  stage.close()
  
def selectFileAction(event):
  global fileFld, cmdFld, runStr, runFld
  fileChooser = javafx.stage.FileChooser()
  fileChooser.getExtensionFilters().add(fileChooser.ExtensionFilter("Python Files","*.py"))
  selectedFile = fileChooser.showOpenDialog(stage)
  fileStr = selectedFile.getAbsolutePath()
  fileFld.setText(fileStr)
  cmdStr = cmdFld.getText()
  runStr = ('%s %s') % (cmdStr,fileStr)
  runFld.setText(runStr)

def runAction(event):
  global runStr
  try:
    s = subprocess.check_output(runStr, shell=True)
  except subprocess.CalledProcessError as e:
    print(f"Command failed with error: {e}")
    
def setup():
  global stage, cBox1, cBox2, cmdFld, fileFld, runFld
  
  size(_wndW,_wndH,FX2D)
  window_title('py5-run-sketch Tester')
  canvas = get_surface().get_native()
  root = canvas.getParent()
  scene = root.getScene()
  stage = scene.getWindow()
  stage.setAlwaysOnTop(True)
  pane = javafx.scene.layout.Pane()
  font = javafx.scene.text.Font.font("Menlo", javafx.scene.text.FontWeight.BOLD, javafx.scene.text.FontPosture.REGULAR, 14)
  # **** Run Btn ****
  arrw = javafx.scene.shape.Polygon()
  arrw.getPoints().addAll(        
    90.0, 52.0,
    90.0, 68.0,
    100.0, 60.0
  )
  arrw.setStroke(javafx.scene.paint.Color.WHITE)
  arrw.setFill(javafx.scene.paint.Color.BLUE)

  runBtn = javafx.scene.control.Button()
  runBtn.setStyle("-fx-background-radius:5em;"+
                  "-fx-min-width:24px;"+
                  "-fx-min-height:24px;"+
                  "-fx-max-width:30px;"+
                  "-fx-max-height:30px;"                 
                  )
  runBtn.setGraphic(arrw)
  runBtn.setLayoutX(_wndW - 60)
  runBtn.setLayoutY(180)
  runBtn.setOnAction(runAction)

# python3 CheckBox
  cBox1 = javafx.scene.control.CheckBox("python3")
  cBox1.setFont(font)
  cBox1.setIndeterminate(False)
  cBox1.setLayoutX(30)
  cBox1.setLayoutY(10)
  cBox1.setOnAction(cBox1Action)
  
# py5-run-sketch CheckBox
  cBox2 = javafx.scene.control.CheckBox("py5-run-sketch")
  cBox2.setFont(font)
  cBox2.setIndeterminate(False)
  cBox2.setLayoutX(180)
  cBox2.setLayoutY(10)
  cBox2.setOnAction(cBox2Action)

# Quit Btn
  quitBtn = javafx.scene.control.Button("Q")
  quitBtn.setStyle("-fx-background-radius:5em;"+"-fx-min-width:30px;"+"-fx-min-height:30px;"+"-fx-max-width:30px;"+"-fx-max-height:30px;")
  quitBtn.setOnAction(quitBtnAction)
  quitBtn.setLayoutX(_wndW - 50)
  quitBtn.setLayoutY(10)
  
# CmdStr Label
  cmdLabel = javafx.scene.control.Label("cmdStr")
  cmdLabel.setFont(font)
  cmdLabel.setLayoutX(30)
  cmdLabel.setLayoutY(45)
  
# Cmd Field
  cmdFld = javafx.scene.control.TextField()
  cmdFld.setLayoutX(30)
  cmdFld.setLayoutY(70)
  cmdFld.setPrefWidth(150)

# SelectFile Button
  selectFileBtn = javafx.scene.control.Button("SelectFile...")
  selectFileBtn.setFont(font)
  selectFileBtn.setLayoutX(230)
  selectFileBtn.setLayoutY(70)
  selectFileBtn.setOnAction(selectFileAction)
  
# FileStr Label
  fileLabel = javafx.scene.control.Label("fileStr")
  fileLabel.setFont(font)
  fileLabel.setLayoutX(30)
  fileLabel.setLayoutY(115)

# File Field
  fileFld = javafx.scene.control.TextField()
  fileFld.setLayoutX(30)
  fileFld.setLayoutY(140)
  fileFld.setPrefWidth(_wndW - 60)
  
# RunStr Label
  runLabel = javafx.scene.control.Label("runStr = cmdStr + fileStr")
  runLabel.setFont(font)
  runLabel.setLayoutX(30)
  runLabel.setLayoutY(195)
  
# Run Field
  runFld = javafx.scene.control.TextField()
  runFld.setLayoutX(30)
  runFld.setLayoutY(215)
  runFld.setPrefWidth(_wndW - 60)  
   
  pane.getChildren().addAll(runBtn,cBox1,cBox2,quitBtn,cmdLabel,cmdFld,selectFileBtn,fileLabel,fileFld,runLabel,runFld)
  root.getChildren().add(pane)

Output:

python3 examples:

1. py5 module mode

import py5

def setup():
    py5.size(300, 200)
    py5.rect_mode(py5.CENTER)

def draw():
    py5.rect(py5.mouse_x, py5.mouse_y, 10, 10)

py5.run_sketch()

2. tkinter

from tkinter import *

wnd = Tk()

C = Canvas(wnd, bg = "yellow", height = 250, width = 300)

line = C.create_line(108, 120, 320, 40, fill = "green")

arc = C.create_arc(180, 150, 80, 210, start=0, extent=220, fill = "red")

oval = C.create_oval(80, 30, 140, 150, fill = "blue")

C.pack()

mainloop()

3. matplotlib

import math
import matplotlib.pyplot as plt

golden=1.61803398875
# golden=1.325
radind=golden**(1/180)
totalDegrees=360
degree=math.pi/180
radius=radind
x=[]
y=[]
for angle in range(0,totalDegrees*4):
    radians=degree*angle
    x.append(
        math.cos(radians)*
        radius)
    y.append(
        math.sin(radians)*
        radius)
    radius*=radind
# plt.figure(figsize=(5,5))
plt.plot(x,y)

plt.show()

4. GraphWin

from graphics import *

def main():
    win = GraphWin("My Circle", 400, 400)
    c = Circle(Point(200,150), 100)
    c.setWidth(30)
    c.draw(win)
    win.getMouse() # pause for click in window
    win.close()

main()

py5-run-sketch example:

1. One and done

# Uses Imported mode for py5

import javafx

_wndW = 600
_wndH = 600
    
def setup():
  global slider,colorPicker
  
  size(_wndW, _wndH, FX2D)
  window_title("JavaFX DotView Default Window")  
  canvas = get_surface().get_native()
  root = canvas.getParent()
  pane = javafx.scene.layout.Pane()
  slider = javafx.scene.control.Slider(20, 500, 10)
  slider.setLayoutX(190)
  slider.setLayoutY(20)
  colorPicker = javafx.scene.control.ColorPicker(javafx.scene.paint.Color.GREEN)
  colorPicker.setLayoutX(400)
  colorPicker.setLayoutY(15)
  pane.getChildren().addAll(slider,colorPicker)
  root.getChildren().add(pane)
  
def draw():
  global slider, colorPicker
  
  background(209)
  Color = colorPicker.getValue()
  fill(int(Color.getRed()*255),int(Color.getGreen()*255),int(Color.getBlue()*255))
  circle(_wndW/2,_wndH/2, float(slider.getValue()))

Just now saw this error message in Thonny:

AWT blocker activation interrupted:
java.lang.InterruptedException

AI Overview says:
The message "AWT blocker activation interrupted: java.lang.InterruptedException" indicates that a thread involved in AWT (Abstract Window Toolkit) operations in Java was interrupted while performing a blocking action.

[vsquared]

Popen is non-blocking. Changing subprocess to Popen stops the beach balling and allows multiple files to be opened.

def runAction(event):
  global runStr
  try:
    proc = subprocess.Popen(runStr, shell=True)
  except Exception as e:
    print(f"Error: {e}")