The range() function in Python is used to generate sequences of numbers. It returns a sequence of integers from start to stop-1 by default or allowing for specification of the start, stop, and step values. Examples show using range() in for loops to print numbers from 0 to 5 with the default start of 0 and increment of 1, from 2 to 6 with a specified start of 2, and from 2 to 30 incrementing by 3. The document also provides examples of calculating a factorial using for and while loops with range().

1. Prof. Neeraj Bhargava
Vishal Dutt
Department of Computer Science, School of
Engineering & System Sciences
MDS University, Ajmer

2. range() Function
• To loop through a set of code a
specified number of times, we can
use the range() function.
• The range() function returns a
sequence of numbers, starting from
0 by default, and increments by 1.
• ends at a specified number.

3. Example:
for x in range(6):
print(x)
Output
0
1
2
3
4
5

4. • The range() function defaults to 0
as a starting value.
• however it is possible to specify
the starting value by adding a
parameter.
Like: range(2, 6)
• It means Loop starts from 2 to 6
(but not including 6)

5. Example:
for x in range(2, 6):
print(x)
Output
2
3
4
5

6. The range() function increment the
sequence by 1 by default.
It is possible to specify the
increment value by adding a third
parameter.
Like: range(2, 30, 3)

7. Example:
for x in range(2, 30, 3):
print(x)
Output
2
5
8
11
14
17
20
23
26
29

8. Factorial using for loop
num = int(input("enter a number: "))
fac = 1
for i in range(1, num + 1):
fac = fac * i
print("factorial of ", num, " is ", fac)

9. Factorial using while loop
num = int(input("enter a number: "))
fac = 1
i = 1
while i <= num:
fac = fac * i
i = i + 1
print("factorial of ", num, " is ", fac)

10. Questions
 Explain range() method in Python?
 Write a Python Script to print the series 2, 3, 4, 5… up to
15?
 Explain the various parameters of the range() with
suitable example.