Combinations of multiple lists





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8















Suppose I have three lists: 



list1 --> [a, b, c, d, e, f, g, h]

list2 --> [i, j, k]

list3 --> [l, m, n, o, p]


I wish to generate all combinations where I take five elements from list1, two elements from list2 and three elements from list3.



eg. 



a, b, c, d, e, i, j, l, m, n  

a, b, c, d, e, i, j, l, m, o

etc.


I tried to use itertools.combinations. 



l1_combinations = itertools.combinations(list1, 5)

l2_combinations = itertools.combinations(list2, 2)

l3_combinations = itertools.combinations(list3, 3)

for l1_iterator in list(l1_combinations):

    for l2_iterator in list(l2_combinations): #added a missing )

        for l3_iterator in list(l3_combinations):

            sample = l1_iterator + l2_iterator + l3_iterator

            print(sample)


But I am getting output with iterations happening only on list3. In all the output, only first five elements from list1 and first two elements from list2 are present. Combinations with other elements from those two lists aren't present.



Can someone help me here and also explain what exactly did i miss ?






python







share|improve this question

























  • Well I'm sure the missing ) in for l2_iterator in list(l2_combinations: doesn't help...

    – Reedinationer
    8 hours ago


















8















Suppose I have three lists: 



list1 --> [a, b, c, d, e, f, g, h]

list2 --> [i, j, k]

list3 --> [l, m, n, o, p]


I wish to generate all combinations where I take five elements from list1, two elements from list2 and three elements from list3.



eg. 



a, b, c, d, e, i, j, l, m, n  

a, b, c, d, e, i, j, l, m, o

etc.


I tried to use itertools.combinations. 



l1_combinations = itertools.combinations(list1, 5)

l2_combinations = itertools.combinations(list2, 2)

l3_combinations = itertools.combinations(list3, 3)

for l1_iterator in list(l1_combinations):

    for l2_iterator in list(l2_combinations): #added a missing )

        for l3_iterator in list(l3_combinations):

            sample = l1_iterator + l2_iterator + l3_iterator

            print(sample)


But I am getting output with iterations happening only on list3. In all the output, only first five elements from list1 and first two elements from list2 are present. Combinations with other elements from those two lists aren't present.



Can someone help me here and also explain what exactly did i miss ?






python







share|improve this question

























  • Well I'm sure the missing ) in for l2_iterator in list(l2_combinations: doesn't help...

    – Reedinationer
    8 hours ago














8












8








8








Suppose I have three lists: 



list1 --> [a, b, c, d, e, f, g, h]

list2 --> [i, j, k]

list3 --> [l, m, n, o, p]


I wish to generate all combinations where I take five elements from list1, two elements from list2 and three elements from list3.



eg. 



a, b, c, d, e, i, j, l, m, n  

a, b, c, d, e, i, j, l, m, o

etc.


I tried to use itertools.combinations. 



l1_combinations = itertools.combinations(list1, 5)

l2_combinations = itertools.combinations(list2, 2)

l3_combinations = itertools.combinations(list3, 3)

for l1_iterator in list(l1_combinations):

    for l2_iterator in list(l2_combinations): #added a missing )

        for l3_iterator in list(l3_combinations):

            sample = l1_iterator + l2_iterator + l3_iterator

            print(sample)


But I am getting output with iterations happening only on list3. In all the output, only first five elements from list1 and first two elements from list2 are present. Combinations with other elements from those two lists aren't present.



Can someone help me here and also explain what exactly did i miss ?






python







share|improve this question
















Suppose I have three lists: 



list1 --> [a, b, c, d, e, f, g, h]

list2 --> [i, j, k]

list3 --> [l, m, n, o, p]


I wish to generate all combinations where I take five elements from list1, two elements from list2 and three elements from list3.



eg. 



a, b, c, d, e, i, j, l, m, n  

a, b, c, d, e, i, j, l, m, o

etc.


I tried to use itertools.combinations. 



l1_combinations = itertools.combinations(list1, 5)

l2_combinations = itertools.combinations(list2, 2)

l3_combinations = itertools.combinations(list3, 3)

for l1_iterator in list(l1_combinations):

    for l2_iterator in list(l2_combinations): #added a missing )

        for l3_iterator in list(l3_combinations):

            sample = l1_iterator + l2_iterator + l3_iterator

            print(sample)


But I am getting output with iterations happening only on list3. In all the output, only first five elements from list1 and first two elements from list2 are present. Combinations with other elements from those two lists aren't present.



Can someone help me here and also explain what exactly did i miss ?






python




python






share|improve this question















share|improve this question













share|improve this question




share|improve this question








edited 8 hours ago









amchugh89

595621




595621










asked 8 hours ago









Arun AranganathanArun Aranganathan

525




525













  • Well I'm sure the missing ) in for l2_iterator in list(l2_combinations: doesn't help...

    – Reedinationer
    8 hours ago



















  • Well I'm sure the missing ) in for l2_iterator in list(l2_combinations: doesn't help...

    – Reedinationer
    8 hours ago

















Well I'm sure the missing ) in for l2_iterator in list(l2_combinations: doesn't help...

– Reedinationer
8 hours ago





Well I'm sure the missing ) in for l2_iterator in list(l2_combinations: doesn't help...

– Reedinationer
8 hours ago












2 Answers
2






active

oldest

votes


















10














As an alternative to regenerating the list of combinations, compute the product of the combinations up front; this also saves you from nesting for loops.



from itertools import combinations, product





list1 = list("abcdefgh")

list2 = list("ijk")

list3 = list("lmnop")



l1 = combinations(list1, 5)

l2 = combinations(list2, 2)

l3 = combinations(list3, 3)

for c1, c2, c3 in product(l1, l2, l3):

    sample = c1 + c2 + c3

    print(sample)





share|improve this answer































    8














    Don't iterate over the same iterator multiple times, after the first time it's exhausted. Iterate over a fresh iterator each time:



    for l1_iterator in itertools.combinations(list1, 5):
    
    for l2_iterator in itertools.combinations(list2, 2):
    
        for l3_iterator in itertools.combinations(list3, 3):
    
            sample = l1_iterator + l2_iterator + l3_iterator
    
            print(sample)


    Or make lists of each one in advance to avoid recomputation:



    l1_combinations = list(itertools.combinations(list1, 5))
    
l2_combinations = list(itertools.combinations(list2, 2))
    
l3_combinations = list(itertools.combinations(list3, 3))
    
for l1_iterator in l1_combinations:
    
    for l2_iterator in l2_combinations:
    
        for l3_iterator in l3_combinations:
    
            sample = l1_iterator + l2_iterator + l3_iterator
    
            print(sample)





    share|improve this answer


























    • What would be a solution to not regenerate the combinations every time?

      – ritlew
      8 hours ago






    • 2





      @ritlew see edit.

      – Alex Hall
      8 hours ago












    Your Answer






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    2 Answers
    2






    active

    oldest

    votes








    2 Answers
    2






    active

    oldest

    votes









    active

    oldest

    votes






    active

    oldest

    votes









    10














    As an alternative to regenerating the list of combinations, compute the product of the combinations up front; this also saves you from nesting for loops.



    from itertools import combinations, product
    

    

    
list1 = list("abcdefgh")
    
list2 = list("ijk")
    
list3 = list("lmnop")
    

    
l1 = combinations(list1, 5)
    
l2 = combinations(list2, 2)
    
l3 = combinations(list3, 3)
    
for c1, c2, c3 in product(l1, l2, l3):
    
    sample = c1 + c2 + c3
    
    print(sample)





    share|improve this answer




























      10














      As an alternative to regenerating the list of combinations, compute the product of the combinations up front; this also saves you from nesting for loops.



      from itertools import combinations, product
      

      

      
list1 = list("abcdefgh")
      
list2 = list("ijk")
      
list3 = list("lmnop")
      

      
l1 = combinations(list1, 5)
      
l2 = combinations(list2, 2)
      
l3 = combinations(list3, 3)
      
for c1, c2, c3 in product(l1, l2, l3):
      
    sample = c1 + c2 + c3
      
    print(sample)





      share|improve this answer


























        10












        10








        10







        As an alternative to regenerating the list of combinations, compute the product of the combinations up front; this also saves you from nesting for loops.



        from itertools import combinations, product
        

        

        
list1 = list("abcdefgh")
        
list2 = list("ijk")
        
list3 = list("lmnop")
        

        
l1 = combinations(list1, 5)
        
l2 = combinations(list2, 2)
        
l3 = combinations(list3, 3)
        
for c1, c2, c3 in product(l1, l2, l3):
        
    sample = c1 + c2 + c3
        
    print(sample)





        share|improve this answer













        As an alternative to regenerating the list of combinations, compute the product of the combinations up front; this also saves you from nesting for loops.



        from itertools import combinations, product
        

        

        
list1 = list("abcdefgh")
        
list2 = list("ijk")
        
list3 = list("lmnop")
        

        
l1 = combinations(list1, 5)
        
l2 = combinations(list2, 2)
        
l3 = combinations(list3, 3)
        
for c1, c2, c3 in product(l1, l2, l3):
        
    sample = c1 + c2 + c3
        
    print(sample)






        share|improve this answer












        share|improve this answer



        share|improve this answer










        answered 8 hours ago









        chepnerchepner

        261k35251344




        261k35251344

























            8














            Don't iterate over the same iterator multiple times, after the first time it's exhausted. Iterate over a fresh iterator each time:



            for l1_iterator in itertools.combinations(list1, 5):
            
    for l2_iterator in itertools.combinations(list2, 2):
            
        for l3_iterator in itertools.combinations(list3, 3):
            
            sample = l1_iterator + l2_iterator + l3_iterator
            
            print(sample)


            Or make lists of each one in advance to avoid recomputation:



            l1_combinations = list(itertools.combinations(list1, 5))
            
l2_combinations = list(itertools.combinations(list2, 2))
            
l3_combinations = list(itertools.combinations(list3, 3))
            
for l1_iterator in l1_combinations:
            
    for l2_iterator in l2_combinations:
            
        for l3_iterator in l3_combinations:
            
            sample = l1_iterator + l2_iterator + l3_iterator
            
            print(sample)





            share|improve this answer


























            • What would be a solution to not regenerate the combinations every time?

              – ritlew
              8 hours ago






            • 2





              @ritlew see edit.

              – Alex Hall
              8 hours ago
















            8














            Don't iterate over the same iterator multiple times, after the first time it's exhausted. Iterate over a fresh iterator each time:



            for l1_iterator in itertools.combinations(list1, 5):
            
    for l2_iterator in itertools.combinations(list2, 2):
            
        for l3_iterator in itertools.combinations(list3, 3):
            
            sample = l1_iterator + l2_iterator + l3_iterator
            
            print(sample)


            Or make lists of each one in advance to avoid recomputation:



            l1_combinations = list(itertools.combinations(list1, 5))
            
l2_combinations = list(itertools.combinations(list2, 2))
            
l3_combinations = list(itertools.combinations(list3, 3))
            
for l1_iterator in l1_combinations:
            
    for l2_iterator in l2_combinations:
            
        for l3_iterator in l3_combinations:
            
            sample = l1_iterator + l2_iterator + l3_iterator
            
            print(sample)





            share|improve this answer


























            • What would be a solution to not regenerate the combinations every time?

              – ritlew
              8 hours ago






            • 2





              @ritlew see edit.

              – Alex Hall
              8 hours ago














            8












            8








            8







            Don't iterate over the same iterator multiple times, after the first time it's exhausted. Iterate over a fresh iterator each time:



            for l1_iterator in itertools.combinations(list1, 5):
            
    for l2_iterator in itertools.combinations(list2, 2):
            
        for l3_iterator in itertools.combinations(list3, 3):
            
            sample = l1_iterator + l2_iterator + l3_iterator
            
            print(sample)


            Or make lists of each one in advance to avoid recomputation:



            l1_combinations = list(itertools.combinations(list1, 5))
            
l2_combinations = list(itertools.combinations(list2, 2))
            
l3_combinations = list(itertools.combinations(list3, 3))
            
for l1_iterator in l1_combinations:
            
    for l2_iterator in l2_combinations:
            
        for l3_iterator in l3_combinations:
            
            sample = l1_iterator + l2_iterator + l3_iterator
            
            print(sample)





            share|improve this answer















            Don't iterate over the same iterator multiple times, after the first time it's exhausted. Iterate over a fresh iterator each time:



            for l1_iterator in itertools.combinations(list1, 5):
            
    for l2_iterator in itertools.combinations(list2, 2):
            
        for l3_iterator in itertools.combinations(list3, 3):
            
            sample = l1_iterator + l2_iterator + l3_iterator
            
            print(sample)


            Or make lists of each one in advance to avoid recomputation:



            l1_combinations = list(itertools.combinations(list1, 5))
            
l2_combinations = list(itertools.combinations(list2, 2))
            
l3_combinations = list(itertools.combinations(list3, 3))
            
for l1_iterator in l1_combinations:
            
    for l2_iterator in l2_combinations:
            
        for l3_iterator in l3_combinations:
            
            sample = l1_iterator + l2_iterator + l3_iterator
            
            print(sample)






            share|improve this answer














            share|improve this answer



            share|improve this answer








            edited 8 hours ago

























            answered 8 hours ago









            Alex HallAlex Hall

            23k32053




            23k32053













            • What would be a solution to not regenerate the combinations every time?

              – ritlew
              8 hours ago






            • 2





              @ritlew see edit.

              – Alex Hall
              8 hours ago



















            • What would be a solution to not regenerate the combinations every time?

              – ritlew
              8 hours ago






            • 2





              @ritlew see edit.

              – Alex Hall
              8 hours ago

















            What would be a solution to not regenerate the combinations every time?

            – ritlew
            8 hours ago





            What would be a solution to not regenerate the combinations every time?

            – ritlew
            8 hours ago




            2




            2





            @ritlew see edit.

            – Alex Hall
            8 hours ago





            @ritlew see edit.

            – Alex Hall
            8 hours ago


















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