There are many iterables in Python like list, tuple etc.
range() gives another way to initialize a sequence of numbers using some conditions.
range() is commonly used in for looping hence, knowledge of same is key aspect when dealing with any kind of Python code.
Syntax : range(start, stop, step)
start : Element from which sequence constructed has to start. (default:0)
stop : Element number at which numbers in sequence have to end (exclusive).
step : Can be +ve or -ve number, denoting the elements need to be skipped during filling of list. (default:1)
Returns : The list using the formula :
list[n] = start + step*n (for both positive and negative step) where, n >=0 and list[n] = 0 and list[n] > stop (for negative step)
Returns ValueError if step is 0. Value constraint is checked in case of step, failing to meet returns empty sequence, else returns sequence according to formula.
Code #1 : Demonstrating range() without step parameter
List generated using 1 parameter : [0, 1, 2, 3, 4, 5] List generated using 2 parameters : [3, 4, 5] List generated using 2 parameters with negatives : [-6, -5, -4, -3, -2, -1, 0, 1]
Code #2 : Demonstrating range() using step
List generated using step : [3, 5, 7, 9] List generated using negative step : [10, 7, 4, 1, -2] List generated using step, value contraints fail : 
Traceback (most recent call last): File "/home/bdae725dff7b38d3681eee38f6a6d434.py", line 23, in print("List generated using 0 step : " + str(list(range(3, 7, 0)))) ValueError: range() arg 3 must not be zero
- range() vs xrange() in Python
- Python range() function
- range() to a list in Python
- Python | Delete elements in range
- Python | Count set bits in a range
- Python | Numbers in a list within a given range
- Python | range() does not return an iterator
- Python | Swapping sublists over given range
- Python | Remove all sublists outside the given range
- Python | Contiguous Boolean Range
- Python | Count unset bits in a range
- Python | Find elements within range in numpy
- Python | Create list of numbers with given range
- Python program to print all odd numbers in a range
- Python program to print all even numbers in a range
If you like GeeksforGeeks and would like to contribute, you can also write an article using contribute.geeksforgeeks.org or mail your article to firstname.lastname@example.org. See your article appearing on the GeeksforGeeks main page and help other Geeks.
Please Improve this article if you find anything incorrect by clicking on the "Improve Article" button below.