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  1. # Generates set partitions recursively
  2.  
  3.  
  4.  
  5. def partitions(set_):
  6.     if not set_:
  7.         yield []
  8.         return    
  9.     for i in xrange(2**len(set_)/2): 
  10.         print i        
  11.         parts = [set(), set()]
  12.         for item in set_:
  13.             parts[i&1].add(item) 
  14.  
  15.             i >>= 1
  16.  
  17.         for b in partitions(parts[1]):
  18.             yield [parts[0]]+b
  19.  
  20.  
  21. #for i in xrange(5):
  22. #   print list(partitions(set(range(i))))
  23.  
  24. print list(partitions(set(range(2))))
Success #stdin #stdout 0.02s 4676KB
comments (?)
stdin 
Standard input is empty
stdout 
0
1
0
[[set([0, 1])], [set([1]), set([0])]]
https://ideone.com/6dwp8
language:
Python (cpython 2.7.16)
created:
13 years ago
visibility:
public

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