{} set comprehension

Description

Returns a set based on existing iterables.

Syntax

{expression(variable) for variable in input_set [predicate][, …]}

expression
Optional. An output expression producing members of the new set from members of the input set that satisfy the predicate expression.
variable
Required. Variable representing members of an input set.
input_set
Required. Represents the input set.
predicate
Optional. Expression acting as a filter on members of the input set.
[, …]]
Optional. Another nested comprehension.

Return Value

set

Time Complexity

#TODO

Example 1

>>> {s for s in [1, 2, 1, 0]}
set([0, 1, 2])
>>> {s**2 for s in [1, 2, 1, 0]}
set([0, 1, 4])
>>> {s**2 for s in range(10)}
set([0, 1, 4, 9, 16, 25, 36, 49, 64, 81])

Example 2

>>> {s for s in [1, 2, 3] if s % 2}
set([1, 3])

Example 3

>>> {(m, n) for n in range(2) for m in range(3, 5)}
set([(3, 0), (3, 1), (4, 0), (4, 1)])

See Also

#TODO