Estimate BPM

bpm_estimator.py

from tkinter import *
from tkinter import ttk
import math
import time

root = Tk()
root.title('BPM Estimator')
root.geometry('300x300')

# math and stuff
clicks = []

def calculate():
    n = 1
    tot_sum = 0
    tot_weight = 0

    for i in range(len(clicks) - 1, 0, -1):
        weight = 1 / n
        tot_sum += weight / (clicks[i] - clicks[i - 1])
        tot_weight += weight
        n += 1

    bpm_text = '?' if tot_weight == 0 else f'{60 * (tot_sum / tot_weight):.1f}'
    b_text.set(f'Click!\n{bpm_text} BPM\n{len(clicks)} Click{"s" if len(clicks) != 1 else ""}')

def do_reset():
    global clicks
    clicks.clear()
    calculate()

def do_click():
    global clicks
    clicks.append(time.time())
    calculate()

# setup UI
ui = ttk.Frame(root, padding=10)
ui.pack(fill=BOTH, expand=True)
b_text = StringVar()
button = ttk.Button(ui, command=do_click, textvariable=b_text)
button.pack(anchor=CENTER, expand=True, fill=BOTH)
reset_button = ttk.Button(ui, command=do_reset, text='Reset')
reset_button.pack(anchor=CENTER, expand=True, fill=BOTH)

calculate()

root.mainloop()