*1. Python3 program to add two numbers*

num1 = 15
num2 = 12

# Adding two nos

sum = num1 + num2

# printing values

print("Sum of {0} and {1} is {2}" .format(num1, num2, sum))


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2. program to find simple interest for given principal amount, time and rate of interest.

  

# We can change values here for
# different inputs

P = int(input())
R = int(input()) 
T = int(input())

# Calculates simple interest 

SI = (P * R * T) / 100

# Print the resultant value of SI 

print("simple interest is", SI)

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3.Find the factorial of given number

def factorial(n):

    if n < 0:

        return 0

    elif n == 0 or n == 1:

        return 1

    else:

        fact = 1

        while(n > 1):

            fact *= n

            n -= 1

        return fact

num = 5;

print("Factorial of",num,"is",

factorial(num))

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4.Program to find sum of square of first n natural numbers



def squaresum(n) :

    sm = 0

    for i in range(1, n+1) :

        sm = sm + (i * i)

    return sm

n = 4
print(squaresum(n))


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5.Write a Python program to sum of all digits of a number

n=int(input("Enter a number:"))
sum=0
while n>0:
   rem=n%10
   sum=sum+rem
   n=int(n/10)



print("The sum of digits of number is:", sum) 

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6.Write a program to check a year is a leap year or not using Python


year=int(input("Enter a Year:"))

if ((year % 100 == 0 and year % 400 == 0) or (year % 100 != 0 and year % 4 == 0)):
     print("It is a Leap Year")
else:
print("It is not a Leap Year") 

7.Write a program to convert Days into years, weeks and months using Python

days=int(input("Enter Day:"))

years =(int) (days / 365)
weeks =(int) (days / 7)
months =(int) (days / 30)

print("Days to Years:",years)
print("Days to Weeks:",weeks)
print("Days to Months:",months)

8.Python program to print all prime number in an interval

  

start = 11
end = 25

  

for val in range(start, end + 1):

   # If num is divisible by any number  
   # between 2 and val, it is not prime 

   if val > 1:

       for n in range(2, val):

           if (val % n) == 0:

               break

       else:

           print(val)

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9.Python program to find Area of a circle

def findArea(r):

    PI = 3.142

    return PI * (r*r);

# Driver method

print(findArea(5))


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10 Python 3 code to find sum  of elements in given array

def _sum(arr,n):

    # return sum using sum 

    # inbuilt sum() function

    return(sum(arr))   

# driver function

arr=[]

# input values to list

arr = [12, 3, 4, 15]

# calculating length of array

n = len(arr)

ans = _sum(arr,n)  

# display sum

print (\'Sum of the array is \',ans)
 

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11.Python program to print Even Numbers in a List 

# list of numbers

list1 = [10, 21, 4, 45, 66, 93]  

# iterating each number in list

for num in list1:

    # checking condition

    if num % 2 == 0:

       print(num, end = " ")


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12.Python program to check if a string is palindrome or not


def isPalindrome(s):

    rev = s[::-1]

    # Checking if both string are equal or not

    if (s == rev):

        return True

    return False

# Driver code

s = "malayalam"

ans = isPalindrome(s)

if ans == 1:

    print("Yes")

else:

    print("No")



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13 function to check if small string is there in big string

def check(string, sub_str):

    if (string.find(sub_str) == -1):

        print("NO")

    else:

        print("YES")     

# driver code

string = "zeus is a programmer"

sub_str ="zeus"

check(string, sub_str)



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