I have the following program. I am trying to understand list comprehension and set comprehension:
mylist = [i for i in range(1,10)]
print(mylist)
clist = []
Curly braces are used for both dictionary and set comprehensions. Which one is created depends on whether you supply the associated value or not, like following (3.4):
>>> a={x for x in range(3)}
>>> a
{0, 1, 2}
>>> type(a)
<class 'set'>
>>> a={x: x for x in range(3)}
>>> a
{0: 0, 1: 1, 2: 2}
>>> type(a)
<class 'dict'>
Set is an unordered, mutable collection of unrepeated elements.
In python you can use set()
to build a set, for example:
set>>> set([1,1,2,3,3])
set([1, 2, 3])
>>> set([3,3,2,5,5])
set([2, 3, 5])
Or use a set comprehension, like a list comprehension but with curly braces:
>>> {x for x in [1,1,5,5,3,3]}
set([1, 3, 5])