Why is there no tuple comprehension in Python?
You can use a generator expression:
tuple(i for i in (1, 2, 3))but parentheses were already taken for … generator expressions.
Raymond Hettinger (one of the Python core developers) had this to say about tuples in a recent tweet:
#python tip: Generally, lists are for looping; tuples for structs. Lists are homogeneous; tuples heterogeneous. Lists for variable length.
This (to me) supports the idea that if the items in a sequence are related enough to be generated by a, well, generator, then it should be a list. Although a tuple is iterable and seems like simply a immutable list, it's really the Python equivalent of a C struct:
struct { int a; char b; float c;} foo;struct foo x = { 3, 'g', 5.9 };becomes in Python
x = (3, 'g', 5.9)
Since Python 3.5, you can also use splat * unpacking syntax to unpack a generator expresion:
*(x for x in range(10)),