Blog

The for loop in python is used to iterate over a sequence or other iterable objects.

The range() function returns the sequence of numbers from 0(by default) with an increment with 1(by default) , and ends at that fixed number.

Syntax: for (variable_name) in range: # body of for

#basic for loop program in python
for i in range(1,11):
     print(i)
Output:
1
2
3
4
5
6
7
8
9
10

# Python program to find the factorial of a number provided by the user. 
# change the value for a different result

num = int(input("Enter a number: ")) 
factorial = 1 

# check if the number is negative, positive or zero 

if num < 0:
 print("Sorry, factorial does not exist for negative numbers") elif 
num == 0:    
 print("The factorial of 0 is 1") 
else:    
 for i in range(1,num+1):    
  factorial = factorial*i     
print("The factorial of",num,"is",factorial)     

Output:
Enter a number: 5
The factorial of 5 is 120

#use of break statement
# Python program to display all the prime numbers within an interval
lower = int(input("Enter lower range: ")) 
upper = int(input("Enter upper range: ")) 

#print("Prime numbers between",lower,"and",upper,"are:")

for num in range(lower,upper + 1):    
   # prime numbers are greater than 1    
   if num > 1:        
     for i in range(2,num):            
         if (num % i) == 0:                
              break        
     else:            
         print(num)