() generator expression

Description

Returns an iterator over elements created by using list comprehension.

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

generator

Time Complexity

#TODO

Example 1

>>> (n for n in [0, 1])
<generator object <genexpr> at 0x00ED7698>
>>> i = (n for n in [0, 1])
>>> i.next()
0
>>> i.next()
1
>>> i.next()
StopIteration

Example 2

>>> i = (n*2 for n in [0, 1, 2, 3])
>>> i
<generator object <genexpr> at 0x00ED7C10>
>>> i.next()
\0
>>> i.next()
2
>>> i.next()
4
>>> i.next()
6
>>> i.next()
StopIteration

Example 3

>>> i = (n*2 for n in [0, 1, 2, 3] if n % 2)
>>> i.next()
2
>>> i.next()
6
>>> i.next()

Example 4

>>> i = ((n, n**2) for n in range(5))
>>> for j in i: print j
...
(0, 0)
(1, 1)
(2, 4)
(3, 9)
(4, 16)

Example 5

>>> i = ((n, m) for n in range(2) for m in range(100, 102))
>>> for j in i: print j
...
(0, 100)
(0, 101)
(1, 100)
(1, 101)

See Also

#TODO