Add SUM of values of two LISTS into new LIST

Question

I have the following two lists   first    1 2 3 4 5  second    6 7 8 9 10    Now I want to add the items from both of these lists into a new list   output should be   third    7 9 11 13 15

User · Answer

You can use this method but it will work only if both the list are of the same size   first    1  2  3  4  5  second    6  7  8  9  10  third       a   len first  b   int 0  while True      x   first b      y   second b      ans   x   y     third append ans      b   b   1     if b    a          break  print third

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What if you have list with different length  then you can try something like this  using zip longest   from itertools import zip longest    izip longest for python2 x  l1    1  2  3  l2    4  5  6  7    gt  gt  gt  list map sum  zip longest l1  l2  fillvalue 0     5  7  9  7

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first    1  2  3  4  5  second    6  7  8  9  10  three   map lambda x y  x y first second  print three    Output   7  9  11  13  15

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j   min len l1   len l2   l3    l1 i  l2 i  for i in range j

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Default behavior in numpy is add componentwise  import numpy as np np add first  second    which outputs  array  7 9 11 13 15

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You can use zip    which will  interleave  the two arrays together  and then map    which will apply a function to each element in an iterable    gt  gt  gt  a    1 2 3 4 5   gt  gt  gt  b    6 7 8 9 10   gt  gt  gt  zip a  b    1  6    2  7    3  8    4  9    5  10    gt  gt  gt  map lambda x  x 0    x 1   zip a  b    7  9  11  13  15

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Perhaps the simplest approach   first    1 2 3 4 5  second    6 7 8 9 10  three     for i in range 0 5       three append first i  second i    print three

User · Answer

The easy way and fast way to do this is   three    sum i  for i in zip first second      7 9 11 13 15    Alternatively  you can use numpy sum   from numpy import sum three   sum  first second   axis 0    array  7 9 11 13 15

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Here is another way to do it  We make use of the internal   add   function of python   class SumList object       def   init   self  this list           self mylist   this list      def   add   self  other           new list              zipped list   zip self mylist  other mylist          for item in zipped list              new list append item 0    item 1           return SumList new list       def   repr   self           return str self mylist   list1   SumList  1 2 3 4 5   list2   SumList  10 20 30 40 50   sum list1 list2   list1   list2 print sum list1 list2    Output   11  22  33  44  55

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From docs  import operator list map operator add  first second

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Try the following code   first    1  2  3  4  second    2  3  4  5  third   map sum  zip first  second

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This extends itself to any number of lists    sum sublist  for sublist in itertools izip  myListOfLists     In your case  myListOfLists would be  first  second

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If you want to add also the rest of the values in the lists you can use this  this is working in Python3 5   def addVectors v1  v2       sum    x   y for x  y in zip v1  v2       if not len v1   gt   len v2           sum    v2 len v1        else          sum    v1 len v2         return sum    for testing  if   name       main         a    1  2      b    1  2  3  4      print a      print b      print addVectors a b

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Assuming both lists a and b have same length  you do not need zip  numpy or anything else   Python 2 x and 3 x    a i  b i  for i in range len a

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If you consider your lists as numpy array  then you need to easily sum them   import numpy as np  third   np array first    np array second   print third   7  9  11  13  15

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The zip function is useful here  used with a list comprehension    x   y for x  y in zip first  second     If you have a list of lists  instead of just two lists    lists of lists     1  2  3    4  5  6    sum x  for x in zip  lists of lists     - gt   5  7  9

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Here is another way to do it It is working fine for me     N int input    num1   list map int  input   split     num2   list map int  input   split     sum     for i in range 0 N     sum append num1 i  num2 i    for element in sum    print element  end       print

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first    1 2 3 4 5      second    6 7 8 9 10       one way     third    x   y for x  y in zip first  second       print  third    third        otherway     fourth          for i j in zip first second           global fourth         fourth append i   j      print  fourth    fourth    third  7  9  11  13  15   fourth  7  9  11  13  15

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My answer is repeated with Thiru s that answered it in Mar 17 at 9 25   It was simpler and quicker  here are his solutions      The easy way and fast way to do this is    three    sum i  for i in zip first second      7 9 11 13 15        Alternatively  you can use numpy sum    from numpy import sum  three   sum  first second   axis 0    array  7 9 11 13 15        You need numpy  numpy array could do some operation like vectors  import numpy as np a    1 2 3 4 5  b    6 7 8 9 10  c   list np array a    np array b   print c    7  9  11  13  15

User · Answer

If you have an unknown number of lists of the same length  you can use the below function   Here the  args accepts a variable number of list arguments  but only sums the same number of elements in each    The   is used again to unpack the elements in each of the lists   def sum lists  args       return list map sum  zip  args     a    1 2 3  b    1 2 3     sum lists a b    Output    2  4  6    Or with 3 lists  sum lists  5 5 5 5 5    10 10 10 10 10    4 4 4 4 4     Output    19  19  19  19  19

User · Answer

one-liner solution   list map lambda x y  x y  a b

[python] Add SUM of values of two LISTS into new LIST

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