Elegant way to perform tuple arithmetic

Question

If you're looking for fast, you can use numpy:

>>> import numpy
>>> numpy.subtract((10, 10), (4, 4))
array([6, 6])

and if you want to keep it in a tuple:

>>> tuple(numpy.subtract((10, 10), (4, 4)))
(6, 6)

One option would be,

>>> from operator import sub
>>> c = tuple(map(sub, a, b))
>>> c
(6, 6)

And itertools.imap can serve as a replacement for map.

Of course you can also use other functions from operator to add, mul, div, etc.

But I would seriously consider moving into another data structure since I don't think this type of problem is fit for tuples

Use zip and a generator expression:

c = tuple(x-y for x, y in zip(a, b))

Demo:

>>> a = (10, 10)
>>> b = (4, 4)
>>> c = tuple(x-y for x, y in zip(a, b))
>>> c
(6, 6)

Use itertools.izip for a memory efficient solution.

help on zip:

>>> print zip.__doc__
zip(seq1 [, seq2 [...]]) -> [(seq1[0], seq2[0] ...), (...)]

Return a list of tuples, where each tuple contains the i-th element
from each of the argument sequences.  The returned list is truncated
in length to the length of the shortest argument sequence.

JFYI, execution time in my laptop in 100000 times iteration

np.subtract(a, b) : 0.18578505516052246

tuple(x - y for x, y in zip(a, b)) : 0.09348797798156738

tuple(map(lambda x, y: x - y, a, b)) : 0.07900381088256836

from operator import sub tuple(map(sub, a, b)) : 0.044342041015625

operator looks more elegant for me.

This can also be done just as nicely without an import at all, although lambda is often undesirable:

tuple(map(lambda x, y: x - y, a, b))

If you are looking to get the distance between two points on say a 2d coordinate plane you should use the absolute value of the subtraction of the pairs.

tuple(map(lambda x ,y: abs(x - y), a, b))

Since in your question there only examples of 2-number-tuples, for such coordinate-like tuples, you may be good with simple built-in "complex" class:

>>> a=complex(7,5)
>>> b=complex(1,2)
>>> a-b
>>> c=a-b
>>> c
(6+3j)
>>> c.real
6.0
>>> c.imag
3.0