Question

Are there any built-in functions that allow elementwise operations over tuples in Python 3? If not, what is the “pythonic” way to perform these operations?

Example: I want to take the percent difference between a and b and compare them to some threshold th.

>>> a = (1, 2, 4)
>>> b = (1.1, 2.1, 4.1)
>>> # compute pd = 100*abs(a-b)/a = (10.0, 5.0, 2.5)
>>> th = 3
>>> # test threshold: pd < th => (False, False, True)

Answer 1

map function

>>> a = (1, 2, 4)
>>> b = (1.1, 2.1, 4.1)
>>> map(lambda a,b: 100*abs(a-b)/a < 3, a, b)
[False, False, True]

EDIT

of course instead of map, you can use list comprehensions, like BrenBarn did http://docs.python.org/tutorial/datastructures.html#nested-list-comprehensions

EDIT 2 zip removed, thanks for DSM to point it out that zip is not needed