| 1 | #!/usr/bin/env python
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| 2 |
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| 3 | import sys
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| 4 | import time
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| 5 |
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| 6 | # cf. Scala by Example, Chapter 3
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| 7 |
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| 8 | class PingPong ( object ):
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| 9 |
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| 10 | def __init__(self,name):
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| 11 | self._name = name
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| 12 |
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| 13 | def pingpong(self,count,partner):
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| 14 | if count == 0:
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| 15 | print "%s: done" % self._name
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| 16 | else:
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| 17 | if count % 500 == 0 or count % 500 == 1:
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| 18 | print "%s: pingpong %d" % ( self._name, count )
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| 19 | partner.pingpong( count-1, self )
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| 20 | time.sleep( 0.001 )
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| 21 |
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| 22 | ping = PingPong( "ping" )
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| 23 | pong = PingPong( "pong" )
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| 24 |
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| 25 | ping.pingpong( int(sys.argv[1]), pong )
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