Sum the second value of each tuple in a list

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I have structure like this:

structure = [('a', 1), ('b', 3), ('c', 2)]

I would like to sum the integers (1+3+2) using sum() builtin method (in one line).

Any ideas?

sum(n for _, n in structure)

would work.

Python, In this we combine all the indices of the element using zip() and the performance of summation using sum function. filter_none. edit close. Python | Group by matching second tuple value in list of tuples Given a list of tuples, the task is to group the tuples by matching the second element in the tuples. We can achieve this using dictionary by checking the second element in each tuple.

sum(x[1] for x in structure)

should work

Python, Sum the second value of each tuple in a list. I have structure like this: structure = [('a', 1), ('b', 3), ('c', 2)]. I would like to sum the integers ( 1+3+2 ) using sum()� Method #2 : Using map() + sum() + list() The combination of above functions can be used to perform this task. In this, we first convert the tuple to list, flatten it’s each list element using map(), perform summation of each using sum() and again employ sum() for overall summation of resultant list.

You could do

sum(zip(*structure)[1])

Sum the second value of each tuple in a list, Sum the second value of each tuple in a list, In this we combine all the indices of the element using zip() and the performance of summation using sum function. In Python, programmers work with a lot of lists. Sometimes, it is necessary to find out the sum of the elements of the lists for other operations within the program. In this article, we will take a look at the following ways to calculate sum of all elements in a Python list: Iterable – It can be a

Using a functional style, you could do

reduce(lambda x,y:x+y[1], structure,0)

How do I sum the first value in each tuple in a list of tuples in Python?, create a list of tuples with the first element as the number and second element Then we apply the for loop with summing the value for each key o the dictionary. Given a list of tuple, the task is to sum the tuples having same first value. Examples: Input: [(1, 13), (2, 190), (3, 82), (1, 12)] Output: [(1, 25), (2, 190), (3

How to sum up a list of tuples having the same first element?, Syntactically, a tuple is a comma-separated list of values: is a list with two elements; the first element is assigned to uname, the second to domain. But sum does not. Each time through the loop, Python selects the next tuple in the list and� Note that each tuple is an element in the given list. Access the second element of each tuple using the nested loops. Remove tuples having duplicate first value

Tuples, Numerical Lists. The range() function*-function); The min(), max(), sum() functions ; Exercises So to get the second item in the list, we need to use an index of 1. Print a statement about each of these values, using their position in the list. Python – Combinations of sum with tuples in tuple list Sometimes, while working with data, we can have a problem in which we need to perform tuple addition among all the tuples in list. This can have application in many domains.

Lists and Tuples, Syntactically, a tuple is a comma-separated list of values: is a list with two elements; the first element is assigned to uname, the second to domain. But sum does not. Each time through the loop, Python selects the next tuple in the list and� For a flat list, dict you cannot do better than O(n) because you have to look at each item in the list to add them up. Python program to calculate the sum of elements in a list Sum of Python list

Comments
  • Surprisingly enough, this is marginally faster than my solution (on python 2.7, OS-X 10.5). -- using a list comprehension increases the speed here by almost 50% (for this small example).
  • The only weakness I can think of is that it won't work if one element happens to be ('a', 3, 'extra-data-to-ignore'), whereas both the explicit index and the zip approaches -- even the reduce -- generalize a little better that way. I guess in Py3 you could write sum(b for _, b, *_ in structure) or something..
  • @mgilson: took the words out of my mouth, I'd just run the tests myself (Python 2.7, OS-X 10.7). I've read before about how fast tuple unpacking is but it was interesting to see it in action. Might have to do with bound checking in the x[1] evaluation.
  • It's a fairly common Python idiom though which many would recognize immediately.
  • @martineau: you definitely could, but in this case that seems like a very roundabout way of writing t[1]..
  • You could use sum(map(operator.itemgetter(1),structure) if you really want to avoid the comprehensions ... (but what's the point really?)
  • @DavidRobinson -- This new version with zip is marginally slower than our answers on python2.7 (OS-X 10.5).
  • Just a hint, functional programming methods almost got removed from Python 3 reduce isn't event loaded by default anymore. So list comprehensions should be preferred in this case