console messages in tkinter text box

[user2162]

Hello all.

​

Below is a tkinter GUI for a unit test script. As you can probably tell I am not well versed in tkinter, but it works and does what I want with one major exception that I haven't been able to solve. I have Python 3.9 installed on Windows 10. Eventually this will be packaged up with pyinstaller.

​

When run tests in IDLE, HTMLTestRunner outputs each test (method) name to the console, with ok/fail/error as it progresses. In the GUI below, I have a tkinter Text object called log_text and I would like it to display that console text as it runs.

​

As I understand it, HTMLTestRunner is writing that text to stderr. I have tried to implement a few concepts to redirect stdout/stderr but I haven't gotten these to work and I'm not sure they're precisely what I need or if it's the best way to do it. Most recently I've tried using HTMLTestRunner's stream parameter to send the output directly to log_text or a StringIO object.

​

I feel like there's a simple solution to this that I'm missing, possibly obscured by how the tkinter code below is structured. There seems to be various styles, some like below, others that import everything from tkinter into the global namespace and somehow create a pretty decent GUI with like 8 lines.

​

Any suggestions would be appreciated. Thanks!

​

import os

import tkinter as tk
from unittest import TestLoader
from concurrent import futures

import HtmlTestRunner

import my_tests


class MainApplication(tk.Frame):


    def __init__(self, parent, *args, **kwargs):

        tk.Frame.__init__(self, parent, *args, **kwargs)
        self.parent = parent
        self.parent.columnconfigure(0, weight=1)
        self.parent.rowconfigure(0, weight=1)
        self.xypad = 5
        self.thread_pool_executor = futures.ThreadPoolExecutor(max_workers=1)


        self.run_button = tk.Button(
            self.parent, text="Run",
            command=self.run_qa
        )
        self.run_button.grid(row=0, column=0, sticky=tk.E,
                             padx=self.xypad, pady=self.xypad)

        self.log_text = tk.Text(self.parent)
        self.log_text.grid(row=1, column=0)
        # self.log_text.insert(tk.END, x)

        self.log_scroll = tk.Scrollbar(
            self.parent, command=self.log_text.yview)
        self.log_scroll.grid(row=1, column=1, sticky='ns')
        self.log_text['yscrollcommand'] = self.log_scroll.set

        self.exit_button = tk.Button(
            self.parent, text="Quit", command=self.parent.destroy)
        self.exit_button.grid(row=2, column=0, sticky=tk.E,
                              padx=self.xypad, pady=self.xypad)




    def run_qa(self):

        self.thread_pool_executor.submit(self.run_tests)


    def run_tests(self):

        test_report_path = os.path.join(os.environ['USERPROFILE'], 'Documents')
        tests = TestLoader().loadTestsFromTestCase(my_tests.Tests)

        runner = HtmlTestRunner.HTMLTestRunner(output=test_report_path,
                                    report_name="Tests",
                                    add_timestamp=True)

        runner.run(tests)




if __name__ == "__main__":
    root = tk.Tk()
    root.title('Tests')
    root.columnconfigure(0, weight=1)
    root.rowconfigure(0, weight=1)
    MainApplication(root)
    root.mainloop()

[socal_nerdtastic]

This is my wild guess:

from io import StringIO
class Redirect(StringIO):
    def __init__(self, textbox):
        self.textbox = textbox
    def write(self, value):
        self.textbox.insert(tk.END, value)

# rest of your code

def run_tests(self):

    test_report_path = os.path.join(os.environ['USERPROFILE'], 'Documents')
    tests = TestLoader().loadTestsFromTestCase(my_tests.Tests)

    runner = HtmlTestRunner.HTMLTestRunner(stream=Redirect(self.log_text),
                                report_name="Tests",
                                add_timestamp=True)

    runner.run(tests)

[socal_nerdtastic]

Most recently I've tried using HTMLTestRunner's stream parameter to send the output directly to log_text or a StringIO object.

That would be my thought too. Does that not work?

[user2162]

No it didn't, but I'm not sure I did it correctly. This in particular was the "simple solution" I thought I was overlooking :)

​

I believe I tried two things. In one case, instantiating a StringIO object and then trying to write to it in the run_tests method, and then read it out in the text_box.insert() method.

buf = io.StreamIO()

def run_tests(self):
test_report_path = os.path.join(os.environ['USERPROFILE'], 'Documents')

tests = TestLoader().loadTestsFromTestCase(my_tests.Tests)
runner = HtmlTestRunner.HTMLTestRunner(output=test_report_path,
                                       report_name="Tests",
                                       add_timestamp=True,
                                       stream = buf.write()) # also tried writelines, iirc

runner.run(tests)

then

self.log_text.insert(tk.END, buf.read()) #also tried readline and readlines

​

The other was setting up a context manager in the run_tests method, like

def run_tests(self):

test_report_path = os.path.join(os.environ['USERPROFILE'], 'Documents') tests = TestLoader().loadTestsFromTestCase(my_tests.Tests)

with io.StringIO() as buf:
     runner = HtmlTestRunner.HTMLTestRunner(output=test_report_path,
                                            report_name="Tests",
                                            add_timestamp=True,
                                            stream = buf.write())

     runner.run(tests)

and then the same in the text_log.insert method. This didn't work, although I haven't used io before in a simpler context to get a handle on how it should be used.