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  queue.Empty
  queue.Full
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import os,random,sys,time
while True:
father = os.fork()
if father:
time.sleep(2)
rd = 7
else:
#random.seed()
rd = random.choice([2,3,4,5])
......

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pythonÓï·¨½éÉÜ

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1.1.1. if
>>> x=int(raw_input("please enter an integer:"))
please enter an integer:-8
>>> if x<0:
...  print 'negative'
... elif x==0:
...  print 'zero'
... else:
...  print 'positive'
...
negative
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