Stop a working function with a button (Python, Tkinter) - python-3.x

Question

I have a little situation with Tkinter. I have a piece of code that constantly receives raw EMG data from Thalmic`s Myo Armband and writes that data (plus the name of a gesture) to a csv file. I designed a little tkinter interface to make it look more user-friendly. What I need is to write a function that will stop the previously started recording function.
Also I have a problem with the label, that shows the number of rows in a csv file, but it is another question.
Here is the code:
from gesture_classificator import MyoRaw
import csv
import tkinter
import tkinter.messagebox
import sys
root = tkinter.Tk()
root.title("Recording data")
m = MyoRaw(sys.argv[1] if len(sys.argv) >= 2 else None)
v = tkinter.StringVar()
entry = tkinter.Entry(root, textvariable=v)
entry.grid(row=0, column=0)
v.set("")
def process_emg(emg, times):
name = v.get()
with open('own_test.csv', 'a+') as file:
writing = csv.writer(file)
writing.writerow(emg+(name,))
def show_row_count():
with open('own_test.csv', 'r') as return_me_the_row_count:
reading = csv.reader(return_me_the_row_count)
data = list(reading)
row_count = len(data)
return row_count
def start_recording():
m.add_emg_handler(process_emg)
m.connect()
def stop_recording():
???
B1 = tkinter.Button(root, text="Start the recording", command=start_recording)
B2 = tkinter.Button(root, text="Stop the recording", command=stop_recording)
rows_number = tkinter.Label(root, text=show_row_count)
rows_number.config(text=show_row_count)
B1.grid(row=1, column=0)
B2.grid(row=1, column=1)
rows_number.grid(row=0, column=1)
root.mainloop()
try:
while True:
m.run(1)
except SystemExit:
pass
finally:
m.disconnect()

Answer 1

According to the MyoRaw code, you would probably like the function MyoRaw.disconnect(), which you would use like this:
def stop_recording():
m.disconnect()
In such cases it would be easier and faster for you to check the documentation and/or the code of the framework you are using.