Enumerate

data = ['Toronto', 'Montreal', 'Waterloo', 'Chennai', 'Bangalore', 123, ['One', 'Two', 'Three']]
for x in enumerate(data):
    print(x)
(0, 'Toronto')
(1, 'Montreal')
(2, 'Waterloo')
(3, 'Chennai')
(4, 'Bangalore')
(5, 123)
(6, ['One', 'Two', 'Three'])
for i, x in enumerate(data):
    print(i, "==>", x)
0 ==> Toronto
1 ==> Montreal
2 ==> Waterloo
3 ==> Chennai
4 ==> Bangalore
5 ==> 123
6 ==> ['One', 'Two', 'Three']
# start the index from 200
for i, x in enumerate(data, 200):
    print(i, "==>", x)
200 ==> Toronto
201 ==> Montreal
202 ==> Waterloo
203 ==> Chennai
204 ==> Bangalore
205 ==> 123
206 ==> ['One', 'Two', 'Three']