Python Hearing frequency sound tester v1.0

"""Hearing frequency sound tester v1.0

By Steve Shambles 2018. Updated Nov 2019.

Requirements: Windows only. No dependencies.

More code atrocities at:
stevepython.wordpress.com

"""
from tkinter import Button, IntVar, Label, LabelFrame, Menu, messagebox
from tkinter import Spinbox, TclError, Tk
import webbrowser
import winsound

def help_info():
    """Help and offer info on hearing ranges at a website"""
    ask_yn = messagebox.askyesno('Help', 'A typical healthy adults hearing'
    ' is from 15hz to 20,000hz.\n\nI have Tinnitus and can only hear up to'
    ' 6000hz.\n\n Conversley, my healthy younger sister can hear 21000hz.\n\n'
    'For more info: https://hypertextbook.com/facts/2003/ChrisDAmbrose.shtml'
    '\n\nClick YES to visit site, or NO to continue.')

    if ask_yn is True:
        webbrowser.open('https://hypertextbook.com/facts/2003/ChrisDAmbrose.shtml')
    else:
        return

def about_menu():
    """Display program info message box"""
    messagebox.showinfo('About', 'Hearing Frequency Sound Tester V1.00'
                        '\nFreeware by Steve Shambles 2018/2019')

def visit_blog():
    """Visit my blog, you know it makes sense."""
    webbrowser.open('https://stevepython.wordpress.com/2018/08/29/hearing-frequency-tester')

def hear_sound():
    """Play the sound at hz frequency for duration."""
    # If input is invalid, eg.non-numeric, then return
    try:
        dur = VAR.get()
        freq = VAR2.get()
    except TclError:
        messagebox.showerror('Error', 'Bad input error, Numbers only please.')
        return

    winsound.Beep(freq, dur)

def hfst_info():
    """Reset spinboxes to default settings."""
    VAR.set(3000)
    VAR2.set(10000)

# The GUI.
root = Tk()
root.title('HFST V1.00')
root.geometry('266x165')
root.resizable(False, False)

main_frame = LabelFrame(root, text="Choose help from menu.")
main_frame.grid(padx=20, column=0, row=0)

# Create the drop down menu.
menu_bar = Menu(root)
file_menu = Menu(menu_bar, tearoff=0)
menu_bar.add_cascade(label='Menu', menu=file_menu)
file_menu.add_command(label='Help', command=help_info)
file_menu.add_command(label='About', command=about_menu)
file_menu.add_separator()
file_menu.add_command(label='Visit my blog', command=visit_blog)
file_menu.add_command(label='Exit', command=root.destroy)
root.config(menu=menu_bar)

# Create frame for duration label.
drtn_frame = Label(main_frame)
drtn_frame.grid(column=0, row=0)

# Create drtn_label.
drtn_label = Label(drtn_frame, fg='blue',
                   text='Duration Msecs', font=('tahoma', '10', 'bold'))
drtn_label.grid(padx=8, pady=8) # label wont appear without this line

# frqncy_frame for frqncy_label.
frqncy_frame = Label(main_frame)
frqncy_frame.grid(column=0, row=1)

# frqncy_label.
frqncy_label = Label(frqncy_frame, fg='blue', text='Frequency Hz',
                     font=('tahoma', '10', 'bold'))
frqncy_label.grid()

drtn_spinbox = Label(main_frame)
drtn_spinbox.grid(column=1, row=0)

VAR = IntVar()
VAR.set(3000) # Default start value.
sbox_drtn_widget = Spinbox(drtn_spinbox, from_=500, to=23000,
                           width=4, increment=1000, textvariable=VAR)
sbox_drtn_widget.grid()

frq_spinbox = Label(main_frame)
frq_spinbox.grid(column=1, row=1)

VAR2 = IntVar()
VAR2.set(10000) # Default start value.
sbox_frq_widget = Spinbox(frq_spinbox, from_=37, to=23000, width=5,
                          increment=100, textvariable=VAR2)
sbox_frq_widget.grid()

# hear_frame for hear button.
hear_frame = Label(main_frame)
hear_frame.grid(row=2, column=0)

# Create the 'Hear' button.
hear_btn = Button(hear_frame, bg='green2', text='Hear', command=hear_sound)
hear_btn.grid(padx=8, pady=8)

# Reset_frame for reset button.
reset_frame = Label(main_frame)
reset_frame.grid(row=2, column=1)

# Create the reset button.
hear_btn = Button(reset_frame, bg='red', text='Reset', command=hfst_info)
hear_btn.grid(padx=8, pady=8)

root.mainloop()