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a       ----       10
b       ----       01
ab     ----       11
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#!/usr/bin/python
import random
def bin(x):
x=int(x)
if x==0:
return str(0)
else:
result=''
while x>0:
mod=x%2
x=x/2
result=str(mod)+result
return result

def getAllSubset(aList):
allSubset=[]
aListLen=len(aList)
combination=pow(2,aListLen)
for i in range(combination):
str2=bin(i)
differ=aListLen-len(str2)
str2=''.join(['0' for i in range(differ)])+str2
subset=[]
for j in range(aListLen):
if int(str2[j])==1:
subset.append(aList[int(j)])
allSubset.append(subset)
return allSubset
if __name__ == "__main__":
num=random.randint(2,5)
aList=[random.randint(0,100) for i in range(num)]
allSubset=getAllSubset(aList)
print allSubset

  


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