Python Raspberry morse buzzer

morse_buzzer.py

from gpiozero import Buzzer
from time import sleep

long_sleep: float = 0.25
short_long_ratio: float = 1/3
short_sleep: float = long_sleep * short_long_ratio

def long(b: Buzzer):
  b.on()
  sleep(long_sleep)
  b.off()
  sleep(short_sleep)
  
def short(b: Buzzer):
  b.on()
  sleep(short_sleep)
  b.off()
  sleep(short_sleep)
  
def text_to_morse(text):
    # Morse code dictionary
    morse_code = { 'A':'.-', 'B':'-...', 
                'C':'-.-.', 'D':'-..', 'E':'.', 
                'F':'..-.', 'G':'--.', 'H':'....', 
                'I':'..', 'J':'.---', 'K':'-.-', 
                'L':'.-..', 'M':'--', 'N':'-.', 
                'O':'---', 'P':'.--.', 'Q':'--.-', 
                'R':'.-.', 'S':'...', 'T':'-', 
                'U':'..-', 'V':'...-', 'W':'.--', 
                'X':'-..-', 'Y':'-.--', 'Z':'--..', 
                '1':'.----', '2':'..---', '3':'...--', 
                '4':'....-', '5':'.....', '6':'-....', 
                '7':'--...', '8':'---..', '9':'----.', 
                '0':'-----', ', ':'--..--', '.':'.-.-.-', 
                '?':'..--..', '!': '–..–', '/':'-..-.', '-':'-....-', 
                '(':'-.--.', ')':'-.--.-'}
    morse_text = ""
    text = text.upper()
    for letter in text:
        if letter != " ":
            morse_text += morse_code[letter] + " "
        else:
            morse_text += " "
    return morse_text

def beep_morse(morse: str):
  buzzer = Buzzer(27)
  for symbol in morse:
    if symbol == '.':
      short(buzzer)
    elif symbol == '-':
      long(buzzer)
    elif symbol == ' ':
      sleep(long_sleep)
        
morse = text_to_morse("SOS SOS SOS")
print(morse)
beep_morse(morse)