Python Classroom notes 03/Sep/2026

Functions

• reusable instructions (block )
• reverse of a number

number = 731
orig = number
rev = 0
until number > 0
   rev = number % 10 + rev * 10
   number = number / 10
say rev

• To make this function

define reverse(number)

    orig = number
    rev = 0
    until number > 0
        rev = number % 10 + rev * 10
        number = number / 10

    return rev

• calling this function

number = 131
rev = reverse(131)
if number == rev
   say pallendrome

• We have also found if the number is prime or not

number = 7
start = 2
is_prime = True
until start < number
    if number % start == 0
        is_prime = False
        exit or break
    start = start + 1
say is_prime

• Now lets create it as function

define is_prime(number)
    start = 2
    is_prime = True
    until start < number
        if number % start == 0
            is_prime = False
            exit or break
        start = start + 1
    return is_prime

• call this

is_prime(7)
is_prime(10)

• Lets calculate largest prime factor

number = 70
start = number - 1
until start > 2
    if number%start == 0 and is_prime(start)
        say start
        break
    start = start - 1

• Prompt for getting right logic

You are an expert in programming
I'm learning how to program
Define your problem here
write your solution here

Guid me towards right solution by hints, dont give direct answer