Python Classroom notes 22/Sep/2026

Conditionals

• Options:

  • if
  • if else
  • if elif .. else

• syntax

if <condition>:
   ...
   ...
   ...

• example

x = 2

if x > 4:
    x = x + 1
    print(x)
print("completed")

• syntax

if <condition>:
    ....
    ....
else:
    ....
    ....

• sample

x = 20

if x > 4:
    x = x + 1
    print(x)
else:
    x = x - 1
    print(x)
print("completed")

• When we have more that two conditions

if <condition>:
   ....
   ....
elif <condition>:
   ....
   ....
elif <condition>:
   ....
   ....
else:
   ....
   ....

• Example

average = 5
if average >= 80:
    print("Grade A")
elif 60 <= average < 80:
    print("Grade B")
else:
    print("Grade C")
print("Grading Completed.")

• sequence of if statements

average = 85
if average >= 80:
    print("Grade A")
if  60 <= average < 80:
    print("Grade B")
if average < 60:
    print("Grade C")
print("Grading completed.")

• Hacker Rank Problem Refer Here

• Basic solution

#!/bin/python3

import math
import os
import random
import re
import sys



if __name__ == '__main__':
    n = int(input().strip())
    if n%2 != 0:
        print("Weird")
    else:
        if 2 <= n <= 5:
            print("Not Weird")
        elif 6 <= n <= 20:
            print("Weird")
        else:
            print("Not Weird")

• optimized version

#!/bin/python3

import math
import os
import random
import re
import sys



if __name__ == '__main__':
    n = int(input().strip())
    if n%2 != 0 or 6 <= n <= 20:
        print("Weird")
    else:
        print("Not Weird")

• Exercise – 1:
  • Take six subject marks as inputs
  • Calculate Average
  • Give me grades according to CBSE Grading.
• Exercise – 2:
  • Take a salary and calculate income tax