Play a 440Hz sinus

sin.py

from array import array
from time import sleep
import math

import pygame
from pygame.mixer import Sound, get_init, pre_init


class Note(Sound):

    def __init__(self, frequency, volume=.1):
        self.frequency = frequency
        Sound.__init__(self, self.build_samples())
        self.set_volume(volume)

    def build_samples(self):
        period = int(round(get_init()[0] / self.frequency))
        samples = array("h", [0] * period)
        amplitude = 2 ** (abs(get_init()[1]) - 1) - 1
        for time in xrange(period):
            tones = []
            tones.append(math.sin((1 * time * 2 * math.pi) / period))
            samples[time] = int(amplitude * (sum(tones) / len(tones)))
        return samples

if __name__ == "__main__":
    pre_init(44100, -16, 1, 1024)
    pygame.init()
    Note(440).play(-1)
    sleep(50)