beep sound writer

f = open('labels_processed.txt', 'r')
y, sr = librosa.load('morse.wav', sr=None)
sample_time = len(y)/sr
# out = open('labels_excel.txt', 'w')

sound = np.zeros((len(y)), dtype='float')
stat = True # init. condition
prev_pos = 0

while True:
    line = f.readline()
    if not line:
        f.close()
        break
    pos = int(float(line.split('\t')[0]) / 10 * sr)

    if stat:
        sound[prev_pos:pos] = librosa.tone(800, sr=44100, length=(pos - prev_pos))
    else:
        prev_pos = pos
    stat = not stat

sf.write('sound_inv.wav', sound, sr)