In [1]:

    

import itertools


    

In [2]:

    

for i in itertools.count():
    print(i)
    if i > 3:
        break


    

    




0
1
2
3
4

In [3]:

    

for i in itertools.count(2):
    print(i)
    if i > 3:
        break


    

    




2
3
4

In [4]:

    

for i in itertools.count(step=3):
    print(i)
    if i > 8:
        break


    

    




0
3
6
9

In [5]:

    

for i in itertools.count(2, 3):
    print(i)
    if i > 8:
        break


    

    




2
5
8
11

In [6]:

    

for i in itertools.count(10, -1):
    print(i)
    if i < 8:
        break


    

    




10
9
8
7

In [7]:

    

for i in itertools.count(0.1, 1.5):
    print(i)
    if i > 3:
        break


    

    




0.1
1.6
3.1

In [8]:

    

for i in itertools.count():
    ii = 0.1 + 1.5 * i
    print(ii)
    if ii > 3:
        break


    

    




0.1
1.6
3.1

In [9]:

    

l1 = ['a', 'b', 'c']
l2 = ['x', 'y', 'z']


    

In [10]:

    

print(list(zip(itertools.count(), l1, l2)))


    

    




[(0, 'a', 'x'), (1, 'b', 'y'), (2, 'c', 'z')]

In [11]:

    

print(list(enumerate(zip(l1, l2))))


    

    




[(0, ('a', 'x')), (1, ('b', 'y')), (2, ('c', 'z'))]