WPM estimation

count_dits_est_wpm.py

# calculate the WPM of a dit ".", dah "-", space (intra word)
# and "/" (inter word) string as per the output of
# https://morsecode.world/international/translator.html
# 
# provide the number of seconds as an argument
#
# example run
# python3 .\count_dits_est_wpm.py 57
# . ...- . .-. -.-- / -.. .. - / .- -. -.. / -.. .- .... / -.-. .- .-. .-. .. . ... / .- / ...- --- .. -.-. . / .- -.-. .-. --- ... ... / - .... . / .- .. .-. .-- .- ...- . ... .-.-.-
# 7.768421052631578
#
# Source:
# https://www.youtube.com/watch?v=bON3iRMHZ6s
# "every dit and dah carries a voice across the airwaves."

def count_dits(dit_dah_stroke_str):
    s = dit_dah_stroke_str.split("/")
    dit_count = sum( 1 if c == "." else (3 if c=="-" else 0)
                     for b in s
                     for c in b)
                     
    intra_word_spacing_dit_count = sum(
        3 * ( len(b.strip().split(" ")) - 1)
        for b in s)
    return (
        (len(s)-1) * 7 + # inter word spacing
        intra_word_spacing_dit_count +
        dit_count )

def calc_wpm_of_dit_dah_stroke_str(dit_dah_stroke_str, seconds):
    dits = count_dits(dit_dah_stroke_str)
    # see https://k7mem.com/Keyer_Speed.html
    # for the constant 1.2 WPM per seconds per dit
    return 1.2/(seconds/dits)

if __name__ == "__main__":
    from sys import argv
    input_line = input()
    print(
        calc_wpm_of_dit_dah_stroke_str(input_line, float(argv[1])) )