Range Function In Python Explained with Examples

In this tutorial, I will teach you about what is Range Function in Python and How to use it using different Example.

So to start our journey, let us visit first some of the frequently asked questions about range() in python.

Watch the video tutorial here before you proceed.

Frequently Asked Questions about Range in Python

At this time, we will continue further with our discussion using different example on how to use range in python.

Syntax of range() function and it’s arguments

range(start, stop, step)

Since have already learned the basic ideas about range() in python. At this point, we will now proceed how to use range in python using the actual coding.

For this tutorial, I am using python 3.8.2 version. you can download it in python.org website. link and for this demonstration the Pycharm IDE.

Range() Function with Stop Parameter

Sample Code:

# Program to explain range() function
# range() function with single parameter

# for loop to print number from 0 to 4
for i in range(5):
  print(i)

Result:

0
1
2
3
4

Explanation:

This is a program that will print the numbers 0 through 4. In this case, the range() method is used with a for loop. The numbers in the range are looped through using the variable i.

There is no other parameter in the line range(5). So, this is the stop parameter for the range() method. Because of this, the result is 0,1,2,3,4.

So, since the stop parameter is 5, the range() method stops printing at 4. Also, if you don’t give a start parameter, range() uses 0 as the default parameter.

3 Variant of using python range function

At this time, we will now explore more examples of using the three variance of range function in python.

Range with One Argument

For the first variant, we will use one Argument:

Sample code:

b = range(10)
for a in b:
print("Current value of a: ", a)

Results:

Current value of a: 0
Current value of a: 1
Current value of a: 2
Current value of a: 3
Current value of a: 4
Current value of a: 5
Current value of a: 6
Current value of a: 7
Current value of a: 8
Current value of a: 9

Code Explanation:

In the above code, when the program executes the range() function with one argument. It creates a sequence of numbers from 0 – 9, then it prints the result with each item in the sequence.

Take note:

The range with one argument always start with 0 with an incremental step of 1.(start = 0 and step = 1)

See the Diagram Below:

Range with Two Arguments

Sample code of using range() function with two arguments:

b = range(2, 10)
for a in b:
print("Current value of a: ", a)

Results:

Current value of a: 2
Current value of a: 3
Current value of a: 4
Current value of a: 5
Current value of a: 6
Current value of a: 7
Current value of a: 8
Current value of a: 9

Code Explanation:

In the example using range with two arguments which are the (start and stop). The program doesn’t have to start with 0 all the time, just like in our example that the start value is 2.

Then it prints the result with each item in the sequence.

It means the we can use this range() function in python to generate a series of numbers from X to Y using a range(X, Y).

See the Diagram Below:

Range with Three Arguments

Sample code of using range() function with three arguments:

b = range(2, 10, 2)
for a in b:
print("Current value of a: ", a)

Results

Current value of a: 2
Current value of a: 4
Current value of a: 6
Current value of a: 8

Code Explanation:

In the example using range with three arguments which are the (start, stop, step). This time we can select not only where the series of numbers will start and stop, but we can also specify the difference between each number and in our case, the step value is 2.

See the Diagram Below:

Important Points of Range in Python to Remember

• The range() function will only work with integers(Whole numbers)
• Only Integer is acceptable for argument and not string or float numbers or any other data type.
• The Three arguments can be a positive or negative integer.
• For Step value, it should not be equal to zero.

Suggested reading from the author

• Python Questions For Interview With Answers

Let’s our Ideas!

This time, I wanted to know from you what else I should include to this range function in python tutorial, just let me know by leaving your comment below.