[Tkinter-discuss] Help needed

[Michael Lange]

Hi,

On Mon, 29 Jul 2019 15:26:30 +0530
Balasubramani K <bala.pursuit at gmail.com> wrote:

> Hi ,
> I'm using following modules in python 3:
> import requests
> import os
> from tqdm import tqdm
>
>
> a piece of code from my script,
>
> requests.get(url, stream=True,allow_redirects=True)
> total_size = int(r.headers['content-length'])
> with open(SaveLocation + SaveFilename, 'wb') as f:
> for data in tqdm(iterable=r.iter_content(chunk_size=Chunk_size),
> total=total_size / Chunk_size, unit='KB', desc=SaveFilename):
>                 f.write(data)
> f.close()
>
> when I run the python file in terminal I get output as below :
>
> 47%|████▋     | 76442/161258.81970214844 [14:12<16:26, 86.00KB/s]
>
> this progress bar I got it from a module called tqdm
>
> Now I'm planning to make UI,  using tkinter with start stop button.
> but when I click start button I need the same tqdm progress bar output
> in the tkinter window

I have used the ttk.Progressbar with external shell commands; if you
don't necessarily need to use tqdm maybe you could use the same technique
for what you are doing.
I added a quick-and-dirty example how to do this below; in the example I
used the command "cdrdao disk-info" on linux, which when no disc is in
the drive will try for about 10 sec. to make sense of the non-existing
disc before giving up, printing "Unit not ready" to stderr for 10 times in
the process which I use here to draw the progress bar.
The gui remains responsive without having to use threads (as you can see
when you hit the stop button).
If you don't need any external command but just want to compare file
sizes, the code may become even simpler.

I hope this helps

Michael

####################################################################

from tkinter import *
from tkinter import ttk
from subprocess import Popen, PIPE
import os, fcntl

root = Tk()
root.pipe = None
f = Frame(root)
f.pack(fill='both', expand=1)
p = ttk.Progressbar(f)
p.pack(padx=100, pady=(100,10))


MSG = ''
def update_progress(msg):
    global MSG
    print(msg)
    MSG += msg
    perc = MSG.count('Unit not ready') * 10
    p.configure(value=perc)

def update():
    sts = root.pipe.poll()
    try:
        out = root.pipe.stderr.read()
    except IOError:
        out = b''
    if out:
        update_progress(out.decode())
    if sts is None:
        root.after(200, update)
    else:
        del root.pipe
        root.pipe = None
        p.configure(value=100)
        print('Process finished with status %d' % sts)

def kill():
    if root.pipe:
        try:
            os.kill(root.pipe.pid, 15)
        except:
            pass

def start():
    global MSG
    MSG = ''
    p.configure(value=0)
    root.pipe = Popen(('cdrdao', 'disk-info'), stdout=PIPE, stderr=PIPE)
    fcntl.fcntl(root.pipe.stdout.fileno(), fcntl.F_SETFL, os.O_NONBLOCK)
    fcntl.fcntl(root.pipe.stderr.fileno(), fcntl.F_SETFL, os.O_NONBLOCK)
    root.after(200, update)

Button(text='stop', command=kill).pack(side='bottom', pady=20)
Button(text='start', command=start).pack(side='bottom', pady=20)

root.mainloop()

####################################################################




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