Summary Tuples tend to perform better than lists in almost every category: Tuples can be constant folded. Tuples can be reused instead of copied. Tuples are compact and don’t over-allocate. Tuples directly reference their elements. Tuples can be constant folded Tuples of constants can be precomputed by Python’s peephole optimizer or AST-optimizer. Lists, on the … Read more
In Python 2: >>> list_a = [1, 2, 3, 4] >>> list_b = [5, 6, 7, 8] >>> zip(list_a, list_b) [(1, 5), (2, 6), (3, 7), (4, 8)] In Python 3: >>> list_a = [1, 2, 3, 4] >>> list_b = [5, 6, 7, 8] >>> list(zip(list_a, list_b)) [(1, 5), (2, 6), (3, 7), (4, … Read more
I don’t think there is a general purpose tuple class in Java but a custom one might be as easy as the following: public class Tuple<X, Y> { public final X x; public final Y y; public Tuple(X x, Y y) { this.x = x; this.y = y; } } Of course, there are some … Read more
You can use x = func()[0] to return the first value, x = func()[1] to return the second, and so on. If you want to get multiple values at a time, use something like x, y = func()[2:4].
Tuples are immutable; you can’t change which variables they contain after construction. However, you can concatenate or slice them to form new tuples: a = (1, 2, 3) b = a + (4, 5, 6) # (1, 2, 3, 4, 5, 6) c = b[1:] # (2, 3, 4, 5, 6) And, of course, build … Read more
c# 7.0 lets you do this: var tupleList = new List<(int, string)> { (1, “cow”), (5, “chickens”), (1, “airplane”) }; If you don’t need a List, but just an array, you can do: var tupleList = new(int, string)[] { (1, “cow”), (5, “chickens”), (1, “airplane”) }; And if you don’t like “Item1” and “Item2”, you … Read more
You can use a generator expression: tuple(i for i in (1, 2, 3)) but parentheses were already taken for … generator expressions.
myfun(*some_tuple) does exactly what you request. The * operator simply unpacks the tuple (or any iterable) and passes them as the positional arguments to the function. Read more about unpacking arguments.
Try using the key keyword with sorted(). sorted([(‘abc’, 121),(‘abc’, 231),(‘abc’, 148), (‘abc’,221)], key=lambda x: x[1]) key should be a function that identifies how to retrieve the comparable element from your data structure. In your case, it is the second element of the tuple, so we access [1]. For optimization, see jamylak’s response using itemgetter(1), which … Read more
Tuples are fixed size in nature whereas lists are dynamic. In other words, a tuple is immutable whereas a list is mutable. You can’t add elements to a tuple. Tuples have no append or extend method. You can’t remove elements from a tuple. Tuples have no remove or pop method. You can find elements in … Read more