Python element-wise tuple operations like sum

Question

Is there anyway to get tuple operations in Python to work like this    gt  gt  gt  a    1 2 3   gt  gt  gt  b    3 2 1   gt  gt  gt  a   b  4 4 4    instead of    gt  gt  gt  a    1 2 3   gt  gt  gt  b    3 2 1   gt  gt  gt  a   b  1 2 3 3 2 1    I know it works like that because the   add   and   mul   methods are defined to work like that  So the only way would be to redefine them

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Here is another handy solution if you are already using numpy  It is compact and the addition operation can be replaced by any numpy expression  import numpy as np tuple np array a    b

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Using all built-ins    tuple map sum  zip a  b

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I currently subclass the  tuple  class to overload   - and    I find it makes the code beautiful and writing the code easier   class tupleN tuple       def   add   self  other           if len self     len other                return NotImplemented         else               return tupleN x y for x y in zip self other       def   sub   self  other           if len self     len other                return NotImplemented         else               return tupleN x-y for x y in zip self other       def   mul   self  other           if len self     len other                return NotImplemented         else               return tupleN x y for x y in zip self other     t1   tupleN  1 3 3   t2   tupleN  1 3 4   print t1   t2  t1 - t2  t1   t2  t1   t1 - t1 - t1   2  6  7   0  0  -1   1  9  12   0  0  0

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import operator tuple map operator add  a  b

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Sort of combined the first two answers  with a tweak to ironfroggy s code so that it returns a tuple   import operator  class stuple tuple       def   add   self  other           return self   class   map operator add  self  other             obviously leaving out checking lengths   gt  gt  gt  a   stuple  1 2 3    gt  gt  gt  b   stuple  3 2 1    gt  gt  gt  a   b  4  4  4    Note  using self   class   instead of stuple to ease subclassing

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Yes  But you can t redefine built-in types  You have to subclass them    class MyTuple tuple       def   add   self  other            if len self     len other                raise ValueError  tuple lengths don t match            return MyTuple x   y for  x  y  in zip self  other

User · Answer

Using all built-ins    tuple map sum  zip a  b

User · Answer

Sort of combined the first two answers  with a tweak to ironfroggy s code so that it returns a tuple   import operator  class stuple tuple       def   add   self  other           return self   class   map operator add  self  other             obviously leaving out checking lengths   gt  gt  gt  a   stuple  1 2 3    gt  gt  gt  b   stuple  3 2 1    gt  gt  gt  a   b  4  4  4    Note  using self   class   instead of stuple to ease subclassing

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import operator tuple map operator add  a  b

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even simpler and without using map  you can do that   gt  gt  gt  tuple sum i  for i in zip  1  2  3    3  2  1     4  4  4

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simple solution without class definition that returns tuple  import operator tuple map operator add a b

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from numpy import array  a   array   1 2 3    b   array   3 2 1     print a   b  gives array  4 4 4    See http   www scipy org Tentative NumPy Tutorial

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I currently subclass the  tuple  class to overload   - and    I find it makes the code beautiful and writing the code easier   class tupleN tuple       def   add   self  other           if len self     len other                return NotImplemented         else               return tupleN x y for x y in zip self other       def   sub   self  other           if len self     len other                return NotImplemented         else               return tupleN x-y for x y in zip self other       def   mul   self  other           if len self     len other                return NotImplemented         else               return tupleN x y for x y in zip self other     t1   tupleN  1 3 3   t2   tupleN  1 3 4   print t1   t2  t1 - t2  t1   t2  t1   t1 - t1 - t1   2  6  7   0  0  -1   1  9  12   0  0  0

User · Answer

import operator tuple map operator add  a  b

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Generator comprehension could be used instead of map  Built-in map function is not obsolete but it s less readable for most people than list generator dict comprehension  so I d recommend not to use map function in general   tuple p q for p  q in zip a  b

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import operator tuple map operator add  a  b

User · Answer

Yes  But you can t redefine built-in types  You have to subclass them    class MyTuple tuple       def   add   self  other            if len self     len other                raise ValueError  tuple lengths don t match            return MyTuple x   y for  x  y  in zip self  other

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In case someone need to average a list of tuples    import operator  from functools import reduce tuple reduce lambda x  y  tuple map operator add  x  y   list of tuples

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simple solution without class definition that returns tuple  import operator tuple map operator add a b

User · Answer

even simpler and without using map  you can do that   gt  gt  gt  tuple sum i  for i in zip  1  2  3    3  2  1     4  4  4

User · Answer

This solution doesn t require an import   tuple map lambda x  y  x   y  tuple1  tuple2

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All generator solution  Not sure on performance  itertools is fast  though   import itertools tuple x y for x  y in itertools izip a b

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Sort of combined the first two answers  with a tweak to ironfroggy s code so that it returns a tuple   import operator  class stuple tuple       def   add   self  other           return self   class   map operator add  self  other             obviously leaving out checking lengths   gt  gt  gt  a   stuple  1 2 3    gt  gt  gt  b   stuple  3 2 1    gt  gt  gt  a   b  4  4  4    Note  using self   class   instead of stuple to ease subclassing

User · Answer

Here is another handy solution if you are already using numpy  It is compact and the addition operation can be replaced by any numpy expression  import numpy as np tuple np array a    b

User · Answer

from numpy import array  a   array   1 2 3    b   array   3 2 1     print a   b  gives array  4 4 4    See http   www scipy org Tentative NumPy Tutorial

User · Answer

from numpy import array  a   array   1 2 3    b   array   3 2 1     print a   b  gives array  4 4 4    See http   www scipy org Tentative NumPy Tutorial

User · Answer

Yes  But you can t redefine built-in types  You have to subclass them    class MyTuple tuple       def   add   self  other            if len self     len other                raise ValueError  tuple lengths don t match            return MyTuple x   y for  x  y  in zip self  other

User · Answer

All generator solution  Not sure on performance  itertools is fast  though   import itertools tuple x y for x  y in itertools izip a b

User · Answer

Using all built-ins    tuple map sum  zip a  b

User · Answer

Using all built-ins    tuple map sum  zip a  b

User · Answer

Sort of combined the first two answers  with a tweak to ironfroggy s code so that it returns a tuple   import operator  class stuple tuple       def   add   self  other           return self   class   map operator add  self  other             obviously leaving out checking lengths   gt  gt  gt  a   stuple  1 2 3    gt  gt  gt  b   stuple  3 2 1    gt  gt  gt  a   b  4  4  4    Note  using self   class   instead of stuple to ease subclassing

User · Answer

from numpy import array  a   array   1 2 3    b   array   3 2 1     print a   b  gives array  4 4 4    See http   www scipy org Tentative NumPy Tutorial

User · Answer

Generator comprehension could be used instead of map  Built-in map function is not obsolete but it s less readable for most people than list generator dict comprehension  so I d recommend not to use map function in general   tuple p q for p  q in zip a  b

User · Answer

In case someone need to average a list of tuples    import operator  from functools import reduce tuple reduce lambda x  y  tuple map operator add  x  y   list of tuples

User · Answer

Yes  But you can t redefine built-in types  You have to subclass them    class MyTuple tuple       def   add   self  other            if len self     len other                raise ValueError  tuple lengths don t match            return MyTuple x   y for  x  y  in zip self  other

User · Answer

This solution doesn t require an import   tuple map lambda x  y  x   y  tuple1  tuple2

[python] Python element-wise tuple operations like sum

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