Scan

“scan” provides simple means to define various types of series. The following examples illustrate this better.

Incremental Scan

>>> pos_list = scan(1, 2) # returns a generator

>>> pos_list.next()
1

>>> pos_list.next()
2

>>> pos_list.next()
3

Decremental Scan

>>> neg_list = scan(-2, -5)

>>> neg_list.next()
-2

>>> neg_list.next()
-5

>>> neg_list.next()
-8

Constant Scan

>>> c_list = scan(7, 7)

>>> c_list.next()
7

>>> c_list.next()
7

>>> c_list.next()
7

Custom Rule

>>> fibo = scan(0, 1, lambda a, b: a + b)

>>> fibo.next()
0

>>> fibo.next()
1

>>> fibo.next()
1

>>> fibo.next()
2