Mercurial > cpython-lru_cache-weakref

annotate Demo/scripts/morse.py @ 4566:6403c94de50d legacy-trunk

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
Added safeguard against failure in __del__.
author Guido van Rossum <guido@python.org>
date Wed, 27 Nov 1996 19:39:58 +0000
parents a8b7ee0e572d
children 2bc66f1df7cc
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
1928
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1 # DAH should be three DOTs.
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2 # Space between DOTs and DAHs should be one DOT.
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3 # Space between two letters should be one DAH.
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4 # Space between two words should be DOT DAH DAH.
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5
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6 import sys, math, audiodev
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7
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8 DOT = 30
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9 DAH = 3 * DOT
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10 OCTAVE = 2 # 1 == 441 Hz, 2 == 882 Hz, ...
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11
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12 morsetab = {
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13 'A': '.-', 'a': '.-',
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14 'B': '-...', 'b': '-...',
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15 'C': '-.-.', 'c': '-.-.',
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16 'D': '-..', 'd': '-..',
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17 'E': '.', 'e': '.',
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18 'F': '..-.', 'f': '..-.',
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19 'G': '--.', 'g': '--.',
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20 'H': '....', 'h': '....',
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21 'I': '..', 'i': '..',
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22 'J': '.---', 'j': '.---',
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23 'K': '-.-', 'k': '-.-',
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24 'L': '.-..', 'l': '.-..',
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25 'M': '--', 'm': '--',
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26 'N': '-.', 'n': '-.',
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27 'O': '---', 'o': '---',
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28 'P': '.--.', 'p': '.--.',
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29 'Q': '--.-', 'q': '--.-',
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30 'R': '.-.', 'r': '.-.',
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31 'S': '...', 's': '...',
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32 'T': '-', 't': '-',
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33 'U': '..-', 'u': '..-',
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34 'V': '...-', 'v': '...-',
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35 'W': '.--', 'w': '.--',
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36 'X': '-..-', 'x': '-..-',
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37 'Y': '-.--', 'y': '-.--',
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38 'Z': '--..', 'z': '--..',
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39 '0': '-----',
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40 '1': '.----',
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41 '2': '..---',
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42 '3': '...--',
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43 '4': '....-',
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44 '5': '.....',
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45 '6': '-....',
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46 '7': '--...',
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47 '8': '---..',
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48 '9': '----.',
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49 ',': '--..--',
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50 '.': '.-.-.-',
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51 '?': '..--..',
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52 ';': '-.-.-.',
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53 ':': '---...',
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54 "'": '.----.',
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55 '-': '-....-',
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56 '/': '-..-.',
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57 '(': '-.--.-',
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58 ')': '-.--.-',
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59 '_': '..--.-',
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60 ' ': ' '
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61 }
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62
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63 # If we play at 44.1 kHz (which we do), then if we produce one sine
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64 # wave in 100 samples, we get a tone of 441 Hz. If we produce two
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65 # sine waves in these 100 samples, we get a tone of 882 Hz. 882 Hz
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66 # appears to be a nice one for playing morse code.
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67 def mkwave(octave):
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68 global sinewave, nowave
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69 sinewave = ''
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70 for i in range(100):
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71 val = int(math.sin(math.pi * float(i) * octave / 50.0) * 30000)
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72 sinewave = sinewave + chr((val >> 8) & 255) + chr(val & 255)
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73 nowave = '\0' * 200
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74
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75 mkwave(OCTAVE)
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76
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77 def main():
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78 import getopt, string
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79 try:
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80 opts, args = getopt.getopt(sys.argv[1:], 'o:p:')
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81 except getopt.error:
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82 sys.stderr.write('Usage ' + sys.argv[0] +
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83 ' [ -o outfile ] [ args ] ...\n')
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84 sys.exit(1)
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85 dev = None
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86 for o, a in opts:
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87 if o == '-o':
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88 import aifc
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89 dev = aifc.open(a, 'w')
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90 dev.setframerate(44100)
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91 dev.setsampwidth(2)
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92 dev.setnchannels(1)
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93 if o == '-p':
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94 mkwave(string.atoi(a))
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95 if not dev:
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96 import audiodev
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97 dev = audiodev.AudioDev()
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98 dev.setoutrate(44100)
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99 dev.setsampwidth(2)
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100 dev.setnchannels(1)
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101 dev.close = dev.stop
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102 dev.writeframesraw = dev.writeframes
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103 if args:
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104 line = string.join(args)
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105 else:
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106 line = sys.stdin.readline()
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107 while line:
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108 mline = morse(line)
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109 play(mline, dev)
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110 if hasattr(dev, 'wait'):
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111 dev.wait()
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112 if not args:
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113 line = sys.stdin.readline()
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114 else:
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115 line = ''
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116 dev.close()
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117
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118 # Convert a string to morse code with \001 between the characters in
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119 # the string.
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120 def morse(line):
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121 res = ''
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122 for c in line:
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123 try:
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124 res = res + morsetab[c] + '\001'
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125 except KeyError:
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126 pass
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127 return res
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128
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129 # Play a line of morse code.
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130 def play(line, dev):
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131 for c in line:
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132 if c == '.':
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133 sine(dev, DOT)
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134 elif c == '-':
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135 sine(dev, DAH)
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136 else: # space
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137 pause(dev, DAH + DOT)
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138 pause(dev, DOT)
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139
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140 def sine(dev, length):
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141 for i in range(length):
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142 dev.writeframesraw(sinewave)
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143
a8b7ee0e572d Get rid of freeze (now its own directory).
Guido van Rossum <guido@python.org>
parents:
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144 def pause(dev, length):
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145 for i in range(length):
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146 dev.writeframesraw(nowave)
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147
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148 if __name__ == '__main__' or sys.argv[0] == __name__:
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149 main()