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# Generate a 440 Hz square waveform in Pygame by building an array of samples and play | |
# it for 5 seconds. Change the hard-coded 440 to another value to generate a different | |
# pitch. | |
# | |
# Run with the following command: | |
# python pygame-play-tone.py | |
from array import array | |
from time import sleep | |
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): | |
if time < period / 2: | |
samples[time] = amplitude | |
else: | |
samples[time] = -amplitude | |
return samples | |
if __name__ == "__main__": | |
pre_init(44100, -16, 1, 1024) | |
pygame.init() | |
Note(440).play(-1) | |
sleep(5) |
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@TrumpetDude That is not a typo. In Python 2 we have both
range
andxrange
. The difference is thatrange
returns an enumeration whereasxrange
returns an iterator.In Python 3
xrange
was renamed torange
replacing the originalrange
method.There are many subtle changes like this between Python 2 and 3 that you might like to be aware of, see the What's New In Python 3.0 article for more examples :)