Understanding Python range() and Loop Control Statements

Python's built‑in range() function is used to generate arithmetic sequences for iteration. For example, range(1,5) produces numbers 1 to 4, while range(1,5,2) yields 1 and 3, and range(5,-1,-1) counts down from 5 to 0.

Typical usage converts the range to a list:

>> list(range(10)
[0, 1, 2, 3, 4, 5, 6, 7, 8, 9]

>> list(range(1,11)
[1, 2, 3, 4, 5, 6, 7, 8, 9, 10]

>> list(range(0,40,5)
[0, 5, 10, 15, 20, 25, 30, 35]

When iterating with for , the range can drive the loop:

>> for i in range(2,11):
...     print(i)
2
3
4
5
6
7
8
9
10

Python also supports loop‑control statements borrowed from C:

break : exits the nearest for or while loop.

continue : skips the rest of the current iteration and proceeds to the next.

pass : a null operation used when a syntactic statement is required but no action is needed.

An else clause can follow a loop and runs only if the loop completes without encountering a break :

>> for i in range(5):
...     if(i == 4):
...         break;
...     else:
...         print(i)
... else:
...     print('for statement is over')
0
1
2
3

The article also includes illustrative images (omitted here) and links to related Python tutorials.