Python range() Function

The Python range() function generates a sequence of numbers.

By default, the sequence starts at 0, increments by 1, and stops before the specified number.

 # create a sequence from 0 to 3 numbers = range(4) # iterating through the sequence for i in numbers: print(i) 

0 1 2 3 

range() Syntax

range(start, stop, step)

The start and step arguments are optional.

range() Return Value

The range() function returns an immutable sequence of numbers.

Example 1: range(stop)

 # create a sequence from 0 to 3 (4 is not included) numbers = range(4) # convert to list and print it print(list(numbers)) # Output: [0, 1, 2, 3]

In this example, we have converted the range sequence to a list.

Example 2: range(start, stop)

 # create a sequence from 2 to 4 (5 is not included) numbers = range(2, 5) print(list(numbers)) # [2, 3, 4] # create a sequence from -2 to 3 numbers = range(-2, 4) print(list(numbers)) # [-2, -1, 0, 1, 2, 3] # creates an empty sequence numbers = range(4, 2) print(list(numbers)) # [] 

Example 3: range(start, stop, step)

 # create a sequence from 2 to 10 with increment of 3 numbers = range(2, 10, 3) print(list(numbers)) # [2, 5, 8] # create a sequence from 4 to -1 with increment of -1 numbers = range(4, -1, -1) print(list(numbers)) # [4, 3, 2, 1, 0] # range(0, 5, 1) is equivalent to range(5) numbers = range(0, 5, 1) print(list(numbers)) # [0, 1, 2, 3, 4]

range() in for Loop

The range() function is commonly used in for loop to iterate the loop a certain number of times. For example,

 # iterate the loop five times for i in range(5): print(f'{i} Hello') 

 0 Hello 1 Hello 2 Hello 3 Hello 4 Hello

Also Read:

• Python list()