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Practice

How to Create a Range of Numbers in Python

The range() function in Python is used to generate a sequence of numbers.

It is primarily used with a for loop to repeat a block of code a specified number of times or generate a sequence of consecutive numbers.


How do you use the range function?​

The range() function can be used in three different ways as shown below.


Single Argument​

range(n) creates a sequence of numbers from 0 to n-1.

For example, range(5) generates numbers from 0 to 4 (0, 1, 2, 3, 4).

Outputs numbers from 0 to 4
for i in range(5):
    print(i)

Two Arguments​

range(start, stop, step) generates numbers starting from start, ending before stop, with a specified step

For example, range(1, 5) generates numbers from 1 to 4 (1, 2, 3, 4).

Outputs numbers from 1 to 4
for i in range(1, 5):
    print(i)

Three Arguments​

range(start, stop, step) generates numbers from start to stop-1 with a step interval.

For example, range(1, 10, 2) generates numbers from 1 to 9, increasing by 2 each time (1, 3, 5, 7, 9).

Outputs numbers from 1 to 9, increasing by 2
for i in range(1, 10, 2):
    print(i)

As shown, the range function is useful in a for loop to repeat a block of code a specific number of times or generate a sequence of numbers.

Example of specifying repetition count
for i in range(100):
    ... # Repeat code block 100 times

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