unit5_ex5.1.2.py

# exercise 5.1.2 from unit 5
'''
We mentioned in the unit the well-known children's song "Little Jonathan" and now it's time to write code that plays it!

How do you do that?

In order to play a note, we need to know its frequency and how long it should be played. For this purpose, use the following two variables:

A dictionary called freqs where the keys are strings representing the name of a character and the values ​​are numbers representing frequencies.

freqs = {"la": 220,
         "si": 247,
         "do": 261,
         "re": 293,
         "mi": 329,
         "fa": 349,
         "sol": 392,
         }
Strings that include the notes of the song:

notes =
"sol,250-mi,250-mi,500-fa,250-re,250-re,500-do,250-re,250-mi,250-fa,250-sol,250-sol,250-sol 500"
The strings are constructed as follows:

Each note is followed by a comma followed by a number representing how long the note should be played. Each character is separated from the other by a dash.

Do the following tasks:

Use the split method to split the character strings by the hyphen character. Is the resulting object an iterable? Verify this by using the dir and type functions.

To play a note, use the following code:

import winsound
...
winsound.Beep(frequency, duration)
The Beep function accepts two parameters: the frequency of a note and the length of time it should be played.

Write a program that plays the song Little Jonathan. For this purpose, create an iterable from the character strings and run a for loop on it, or alternatively use the next function.

'''
import winsound

freqs = {"la": 220,
         "si": 247,
         "do": 261,
         "re": 293,
         "mi": 329,
         "fa": 349,
         "sol": 392,
         }

notes = "sol,250-mi,250-mi,500-fa,250-re,250-re,500-do,250-re,250-mi,250-fa,250-sol,250-sol,250-sol,500"

def first_solution():
    """
    Play a series of notes specified in the `notes` variable.
    Each note is specified as a string in the format "freq,duration", where
    freq is the frequency of the note and duration is the length of time to play
    the note in milliseconds. The notes are separated by a dash (-).
    """
    split_notes = notes.split('-')
    for note in split_notes:
        freq = note.split(',')[0]
        duration = int(note.split(',')[1])
        winsound.Beep(freqs[freq], duration)

def main():
    """
    Main function that calls the first_solution function to play the notes.
    """
    first_solution()

if __name__ == "__main__":
    main()