Python range

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Introduction

The range function is a built-in function in Python that generates a sequence of numbers. This sequence can be used in many different ways, including looping through a set of values, creating lists, and more. In this tutorial, we will explore the range function and its various applications.

Basic Usage

The range function is used to generate a sequence of numbers. It takes in three arguments: start, stop, and step. start specifies the starting point of the sequence, stop specifies the end point of the sequence, and step specifies the step size between each number in the sequence.

Here’s a basic example of how to use the range function:

# generate sequence of numbers from 0 to 4
for i in range(5):
    print(i)

In this example, we use the range function with only one argument, which specifies the stop value. This generates a sequence of numbers from 0 to 4, which is then looped through using a for loop. The print function is used to display each number in the sequence.

Using Start and Stop Values

The range function can also take in a start value in addition to the stop value. This allows you to generate a sequence of numbers starting from a specific value.

# generate sequence of numbers from 1 to 5
for i in range(1, 6):
    print(i)

In this example, we use the range function with two arguments, which specify the start and stop values. This generates a sequence of numbers from 1 to 5, which is then looped through using a for loop.

Using Step Values

The range function can also take in a step value, which specifies the step size between each number in the sequence.

# generate sequence of even numbers from 0 to 8
for i in range(0, 10, 2):
    print(i)

In this example, we use the range function with three arguments, which specify the start value, stop value, and step value. This generates a sequence of even numbers from 0 to 8 (inclusive), which is then looped through using a for loop.

Creating Lists

The range function can also be used to create lists of numbers. You can do this by passing the range function to the list function.

# create list of odd numbers from 1 to 9
odd_numbers = list(range(1, 10, 2))
print(odd_numbers)

In this example, we use the range function to generate a sequence of odd numbers from 1 to 9. We then pass this sequence to the list function, which converts it into a list. Finally, we use the print function to display the resulting list.

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