Python 3 Code Examples


# This program prints Hello, world!

print('Hello, world!')

1

2

3

4

5

# This program prints Hello, world!

print('Hello, world!')


# This program adds two numbers
num1 = 5.5
num2 = 1.15
# Add two numbers
sum = float(num1) + float(num2)
# Display the sum
print('The sum of {0} and {1} is {2}'.format(num1, num2, sum))

1

2

3

4

5

6

7

8

9

# This program adds two numbers

num1 = 5.5

num2 = 1.15

# Add two numbers

sum = float(num1) + float(num2)

# Display the sum

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


# Python Program to calculate the square root


#to take the input from the user
num = float(input('Enter a number: '))
num_sqrt = num ** 0.5
print('The square root of %0.3f is %0.3f'%(num ,num_sqrt))

1

2

3

4

5

6

7

8

9

# Python Program to calculate the square root

#to take the input from the user

num = float(input('Enter a number: '))

num_sqrt = num ** 0.5

print('The square root of %0.3f is %0.3f'%(num ,num_sqrt))


# Python Program to find the area of triangle


# to take inputs from the user
a = float(input('Enter first side: '))
b = float(input('Enter second side: '))
c = float(input('Enter third side: '))

# calculate the semi-perimeter
s = (a + b + c) / 2

# calculate the area
area = (s*(s-a)*(s-b)*(s-c)) ** 0.5
print('The area of the triangle is %0.2f' %area)

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

# Python Program to find the area of triangle

# to take inputs from the user

a = float(input('Enter first side: '))

b = float(input('Enter second side: '))

c = float(input('Enter third side: '))

# calculate the semi-perimeter

s = (a + b + c) / 2

# calculate the area

area = (s*(s-a)*(s-b)*(s-c)) ** 0.5

print('The area of the triangle is %0.2f' %area)


# Python program to find Area of a circle 
  
def findArea(r): 
    PI = 3.142
    return PI * (r*r); 
  
# Driver method
num=float(input("Enter r value:"))
print("Area is %.6f" % findArea(num));

1

2

3

4

5

6

7

8

9

10

11

# Python program to find Area of a circle

def findArea(r):

PI = 3.142

return PI * (r*r);

# Driver method

num=float(input("Enter r value:"))

print("Area is %.6f" % findArea(num));


# Solve the quadratic equation ax**2 + bx + c = 0

# import complex math module
import cmath


# To take coefficient input from the users
a = float(input('Enter a: '))
b = float(input('Enter b: '))
c = float(input('Enter c: '))

# calculate the discriminant
d = (b**2) - (4*a*c)

# find two solutions
sol1 = (-b-cmath.sqrt(d))/(2*a)
sol2 = (-b+cmath.sqrt(d))/(2*a)

print('The solution are {0} and {1}'.format(sol1,sol2))

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21

# Solve the quadratic equation ax**2 + bx + c = 0

# import complex math module

import cmath

# To take coefficient input from the users

a = float(input('Enter a: '))

b = float(input('Enter b: '))

c = float(input('Enter c: '))

# calculate the discriminant

d = (b**2) - (4*a*c)

# find two solutions

sol1 = (-b-cmath.sqrt(d))/(2*a)

sol2 = (-b+cmath.sqrt(d))/(2*a)

print('The solution are {0} and {1}'.format(sol1,sol2))


# Python program to swap two variables

# To take input from the user
x = input('Enter value of x: ')
y = input('Enter value of y: ')

# create a temporary variable and swap the values
temp = x
x = y
y = temp

print('The value of x after swapping: {}'.format(x))
print('The value of y after swapping: {}'.format(y))

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

# Python program to swap two variables

# To take input from the user

x = input('Enter value of x: ')

y = input('Enter value of y: ')

# create a temporary variable and swap the values

temp = x

x = y

y = temp

print('The value of x after swapping: {}'.format(x))

print('The value of y after swapping: {}'.format(y))


# Program to generate a random number between 0 and 100

# import the random module
import random

print(random.randint(0,100))

1

2

3

4

5

6

7

8

# Program to generate a random number between 0 and 100

# import the random module

import random

print(random.randint(0,100))


kilometers = 10

# To take kilometers from the user
kilometers = float(input("Enter value in kilometers"))

# conversion factor
conv_fac = 0.621371

# calculate miles
miles = kilometers * conv_fac
print('%0.3f kilometers is equal to %0.3f miles' %(kilometers,miles))

1

2

3

4

5

6

7

8

9

10

11

12

13

kilometers = 10

# To take kilometers from the user

kilometers = float(input("Enter value in kilometers"))

# conversion factor

conv_fac = 0.621371

# calculate miles

miles = kilometers * conv_fac

print('%0.3f kilometers is equal to %0.3f miles' %(kilometers,miles))


# Python Program to convert temperature in celsius to fahrenheit

# To take celsius from the user 
celsius= float(input("Enter value in celsius"))

# calculate fahrenheit
fahrenheit = (celsius * 1.8) + 32
print('%0.1f degree Celsius is equal to %0.1f degree Fahrenheit' %(celsius,fahrenheit))

1

2

3

4

5

6

7

8

9

10

# Python Program to convert temperature in celsius to fahrenheit

# To take celsius from the user

celsius= float(input("Enter value in celsius"))

# calculate fahrenheit

fahrenheit = (celsius * 1.8) + 32

print('%0.1f degree Celsius is equal to %0.1f degree Fahrenheit' %(celsius,fahrenheit))


# 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 = [120, 30, 24, 5] 
  
# calculating length of array 
n = len(arr) 
  
ans = _sum(arr,n) 
  
# display sum 
print ('Sum of the array is ',ans)

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21

22

# 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 = [120, 30, 24, 5]

# calculating length of array

n = len(arr)

ans = _sum(arr,n)

# display sum

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


num = float(input("Enter a number: "))
if num > 0:
   print("Positive number")
elif num == 0:
   print("Zero")
else:
   print("Negative number")

1

2

3

4

5

6

7

8

9

num = float(input("Enter a number: "))

if num > 0:

print("Positive number")

elif num == 0:

print("Zero")

else:

print("Negative number")


# Python program to check if the input number is odd or even.
# A number is even if division by 2 give a remainder of 0.
# If remainder is 1, it is odd number.
num = int(input("Enter a number: "))
if (num % 2) == 0:
   print("{0} is Even".format(num))
else:
   print("{0} is Odd".format(num))

1

2

3

4

5

6

7

8

9

10

# Python program to check if the input number is odd or even.

# A number is even if division by 2 give a remainder of 0.

# If remainder is 1, it is odd number.

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

if (num % 2) == 0:

print("{0} is Even".format(num))

else:

print("{0} is Odd".format(num))


# Python program to check if the input year is a leap year or not

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

if (year % 4) == 0:
   if (year % 100) == 0:
       if (year % 400) == 0:
           print("{0} is a leap year".format(year))
       else:
           print("{0} is not a leap year".format(year))
   else:
       print("{0} is a leap year".format(year))
else:
   print("{0} is not a leap year".format(year))

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

# Python program to check if the input year is a leap year or not

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

if (year % 4) == 0:

if (year % 100) == 0:

if (year % 400) == 0:

print("{0} is a leap year".format(year))

else:

print("{0} is not a leap year".format(year))

else:

print("{0} is a leap year".format(year))

else:

print("{0} is not a leap year".format(year))


# Python program to find the largest number among the three input numbers

# change the values of num1, num2 and num3 for a different result

num1 = float(input("Enter first number: "))
num2 = float(input("Enter second number: "))
num3 = float(input("Enter third number: "))

if (num1 >= num2) and (num1 >= num3):
   largest = num1
elif (num2 >= num1) and (num2 >= num3):
   largest = num2
else:
   largest = num3

print("The largest number between",num1,",",num2,"and",num3,"is",largest)

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

# Python program to find the largest number among the three input numbers

# change the values of num1, num2 and num3 for a different result

num1 = float(input("Enter first number: "))

num2 = float(input("Enter second number: "))

num3 = float(input("Enter third number: "))

if (num1 >= num2) and (num1 >= num3):

largest = num1

elif (num2 >= num1) and (num2 >= num3):

largest = num2

else:

largest = num3

print("The largest number between",num1,",",num2,"and",num3,"is",largest)


# Python program to check if the input number is prime or not

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

# prime numbers are greater than 1
if num > 1:
   # check for factors
   for i in range(2,num):
       if (num % i) == 0:
           print(num,"is not a prime number")
           print(i,"times",num//i,"is",num)
           break
   else:
       print(num,"is a prime number")
       
# if input number is less than
# or equal to 1, it is not prime
else:
   print(num,"is not a prime number")

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21

# Python program to check if the input number is prime or not

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

# prime numbers are greater than 1

if num > 1:

# check for factors

for i in range(2,num):

if (num % i) == 0:

print(num,"is not a prime number")

print(i,"times",num//i,"is",num)

break

else:

print(num,"is a prime number")

# if input number is less than

# or equal to 1, it is not prime

else:

print(num,"is not a prime number")


# Python program to display all the prime numbers within an interval

# change the values of lower and upper for a different result

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)

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

# Python program to display all the prime numbers within an interval

# change the values of lower and upper for a different result

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)


# Python program to find the factorial of a number provided by the user.




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)

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

# Python program to find the factorial of a number provided by the user.

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)


# To take input from the user
num = int(input("Display multiplication table of? "))

# use for loop to iterate 10 times
for i in range(1, 11):
   print(num,'x',i,'=',num*i)

1

2

3

4

5

6

7

8

# To take input from the user

num = int(input("Display multiplication table of? "))

# use for loop to iterate 10 times

for i in range(1, 11):

print(num,'x',i,'=',num*i)


# Program to display the Fibonacci sequence up to n-th term where n is provided by the user
#take input from the user
nterms = int(input("How many terms? "))

# first two terms
n1 = 0
n2 = 1
count = 0

# check if the number of terms is valid
if nterms <= 0:
   print("Please enter a positive integer")
elif nterms == 1:
   print("Fibonacci sequence upto",nterms,":")
   print(n1)
else:
   print("Fibonacci sequence upto",nterms,":")
   while count < nterms:
       print(n1,end=' , ')
       nth = n1 + n2
       # update values
       n1 = n2
       n2 = nth
       count += 1

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21

22

23

24

25

26

# Program to display the Fibonacci sequence up to n-th term where n is provided by the user

#take input from the user

nterms = int(input("How many terms? "))

# first two terms

n1 = 0

n2 = 1

count = 0

# check if the number of terms is valid

if nterms <= 0:

print("Please enter a positive integer")

elif nterms == 1:

print("Fibonacci sequence upto",nterms,":")

print(n1)

else:

print("Fibonacci sequence upto",nterms,":")

while count < nterms:

print(n1,end=' , ')

nth = n1 + n2

# update values

n1 = n2

n2 = nth

count += 1


# Python program to check if the number provided by the user is an Armstrong number or not
# take input from the user
num = int(input("Enter a number: "))
# initialize sum
sum = 0
# find the sum of the cube of each digit
temp = num
while temp > 0:
   digit = temp % 10
   sum += digit ** 3
   temp //= 10
# display the result
if num == sum:
   print(num,"is an Armstrong number")
else:
   print(num,"is not an Armstrong number")

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

# Python program to check if the number provided by the user is an Armstrong number or not

# take input from the user

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

# initialize sum

sum = 0

# find the sum of the cube of each digit

temp = num

while temp > 0:

digit = temp % 10

sum += digit ** 3

temp //= 10

# display the result

if num == sum:

print(num,"is an Armstrong number")

else:

print(num,"is not an Armstrong number")


# Program to check Armstrong numbers in certain interval

# To take input from the user
lower = int(input("Enter lower range: "))
upper = int(input("Enter upper range: "))

for num in range(lower, upper + 1):

   # order of number
   order = len(str(num))
    
   # initialize sum
   sum = 0

   # find the sum of the cube of each digit
   temp = num
   while temp > 0:
       digit = temp % 10
       sum += digit ** order
       temp //= 10

   if num == sum:
       print(num)

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21

22

23

24

25

# Program to check Armstrong numbers in certain interval

# To take input from the user

lower = int(input("Enter lower range: "))

upper = int(input("Enter upper range: "))

for num in range(lower, upper + 1):

# order of number

order = len(str(num))

# initialize sum

sum = 0

# find the sum of the cube of each digit

temp = num

while temp > 0:

digit = temp % 10

sum += digit ** order

temp //= 10

if num == sum:

print(num)


# Python program to find the sum of natural numbers up to n where n is provided by user

#to take input from the user
num = int(input("Enter a number: "))

if num < 0:
   print("Enter a positive number")
else:
   sum = 0
   # use while loop to iterate un till zero
   while(num > 0):
       sum += num
       num -= 1
   print("The sum is",sum)

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

# Python program to find the sum of natural numbers up to n where n is provided by user

#to take input from the user

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

if num < 0:

print("Enter a positive number")

else:

sum = 0

# use while loop to iterate un till zero

while(num > 0):

sum += num

num -= 1

print("The sum is",sum)


# Python Program to display the powers of 2 using anonymous function

#to take number of terms from user
terms = int(input("How many terms? "))

# use anonymous function
result = list(map(lambda x: 2 ** x, range(terms)))

# display the result

print("The total terms is:",terms)
for i in range(terms):
   print("2 raised to power",i,"is",result[i])

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

# Python Program to display the powers of 2 using anonymous function

#to take number of terms from user

terms = int(input("How many terms? "))

# use anonymous function

result = list(map(lambda x: 2 ** x, range(terms)))

# display the result

print("The total terms is:",terms)

for i in range(terms):

print("2 raised to power",i,"is",result[i])


# Python Program to find numbers divisible by fifteen from a list using anonymous function

# Take a list of numbers
my_list = [300, 45, 65, 12, 77, 145, 5,]

# use anonymous function to filter
result = list(filter(lambda x: (x % 15 == 0), my_list))

# display the result
print("Numbers divisible by 13 are",result)

1

2

3

4

5

6

7

8

9

10

11

12

# Python Program to find numbers divisible by fifteen from a list using anonymous function

# Take a list of numbers

my_list = [300, 45, 65, 12, 77, 145, 5,]

# use anonymous function to filter

result = list(filter(lambda x: (x % 15 == 0), my_list))

# display the result

print("Numbers divisible by 13 are",result)


# Python program to convert decimal number into binary, octal and hexadecimal number system

# Change this line for a different result
dec = int(input("Enter a decimal number "))

print("The decimal value of",dec,"is:")
print(bin(dec),"in binary.")
print(oct(dec),"in octal.")
print(hex(dec),"in hexadecimal.")

1

2

3

4

5

6

7

8

9

10

11

# Python program to convert decimal number into binary, octal and hexadecimal number system

# Change this line for a different result

dec = int(input("Enter a decimal number "))

print("The decimal value of",dec,"is:")

print(bin(dec),"in binary.")

print(oct(dec),"in octal.")

print(hex(dec),"in hexadecimal.")


# Program to find the ASCII value of the given character

#to take character from user
c = input("Enter a character: ")

print("The ASCII value of '" + c + "' is",ord(c))

1

2

3

4

5

6

7

8

# Program to find the ASCII value of the given character

#to take character from user

c = input("Enter a character: ")

print("The ASCII value of '" + c + "' is",ord(c))


# Python program to find the H.C.F of two input number

# define a function
def computeHCF(x, y):

# choose the smaller number
    if x > y:
        smaller = y
    else:
        smaller = x
    for i in range(1, smaller+1):
        if((x % i == 0) and (y % i == 0)):
            hcf = i
            
    return hcf

# take input from the user
num1 = int(input("Enter first number: "))
num2 = int(input("Enter second number: "))

print("The H.C.F. of", num1,"and", num2,"is", computeHCF(num1, num2))

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21

22

23

# Python program to find the H.C.F of two input number

# define a function

def computeHCF(x, y):

# choose the smaller number

if x > y:

smaller = y

else:

smaller = x

for i in range(1, smaller+1):

if((x % i == 0) and (y % i == 0)):

hcf = i

return hcf

# take input from the user

num1 = int(input("Enter first number: "))

num2 = int(input("Enter second number: "))

print("The H.C.F. of", num1,"and", num2,"is", computeHCF(num1, num2))


# Python Program to find the L.C.M. of two input number

# define a function
def lcm(x, y):
   """This function takes two
   integers and returns the L.C.M."""

   # choose the greater number
   if x > y:
       greater = x
   else:
       greater = y

   while(True):
       if((greater % x == 0) and (greater % y == 0)):
           lcm = greater
           break
       greater += 1

   return lcm

#to take input from the user
num1 = int(input("Enter first number: "))
num2 = int(input("Enter second number: "))

print("The L.C.M. of", num1,"and", num2,"is", lcm(num1, num2))

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21

22

23

24

25

26

27

28

# Python Program to find the L.C.M. of two input number

# define a function

def lcm(x, y):

"""This function takes two

integers and returns the L.C.M."""

# choose the greater number

if x > y:

greater = x

else:

greater = y

while(True):

if((greater % x == 0) and (greater % y == 0)):

lcm = greater

break

greater += 1

return lcm

#to take input from the user

num1 = int(input("Enter first number: "))

num2 = int(input("Enter second number: "))

print("The L.C.M. of", num1,"and", num2,"is", lcm(num1, num2))


# Python Program to find the factors of a number

# define a function
def print_factors(x):
   # This function takes a number and prints the factors

   print("The factors of",x,"are:")
   for i in range(1, x + 1):
       if x % i == 0:
           print(i)

#to take input from the user
num = int(input("Enter a number: "))

print_factors(num)

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

# Python Program to find the factors of a number

# define a function

def print_factors(x):

# This function takes a number and prints the factors

print("The factors of",x,"are:")

for i in range(1, x + 1):

if x % i == 0:

print(i)

#to take input from the user

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

print_factors(num)


# Program make a simple calculator that can add, subtract, multiply and divide using functions
# This function adds two numbers 
def add(x, y):
   return x + y
# This function subtracts two numbers 
def subtract(x, y):
   return x - y
# This function multiplies two numbers
def multiply(x, y):
   return x * y
# This function divides two numbers
def divide(x, y):
   return x / y
print("Select operation.")
print("1.Add")
print("2.Subtract")
print("3.Multiply")
print("4.Divide")
# Take input from the user 
choice = input("Enter choice(1/2/3/4):")
num1 = int(input("Enter first number: "))
num2 = int(input("Enter second number: "))
if choice == '1':
   print(num1,"+",num2,"=", add(num1,num2))
elif choice == '2':
   print(num1,"-",num2,"=", subtract(num1,num2))
elif choice == '3':
   print(num1,"*",num2,"=", multiply(num1,num2))
elif choice == '4':
   print(num1,"/",num2,"=", divide(num1,num2))
else:
   print("Invalid input")

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21

22

23

24

25

26

27

28

29

30

31

32

33

34

# Program make a simple calculator that can add, subtract, multiply and divide using functions

# This function adds two numbers

def add(x, y):

return x + y

# This function subtracts two numbers

def subtract(x, y):

return x - y

# This function multiplies two numbers

def multiply(x, y):

return x * y

# This function divides two numbers

def divide(x, y):

return x / y

print("Select operation.")

print("1.Add")

print("2.Subtract")

print("3.Multiply")

print("4.Divide")

# Take input from the user

choice = input("Enter choice(1/2/3/4):")

num1 = int(input("Enter first number: "))

num2 = int(input("Enter second number: "))

if choice == '1':

print(num1,"+",num2,"=", add(num1,num2))

elif choice == '2':

print(num1,"-",num2,"=", subtract(num1,num2))

elif choice == '3':

print(num1,"*",num2,"=", multiply(num1,num2))

elif choice == '4':

print(num1,"/",num2,"=", divide(num1,num2))

else:

print("Invalid input")


# Python program to display calendar of given month of the year

# import module
import calendar

# To ask month and year from the user
yy = int(input("Enter year: "))
mm = int(input("Enter month: "))

# display the calendar
print(calendar.month(yy, mm))

1

2

3

4

5

6

7

8

9

10

11

12

13

# Python program to display calendar of given month of the year

# import module

import calendar

# To ask month and year from the user

yy = int(input("Enter year: "))

mm = int(input("Enter month: "))

# display the calendar

print(calendar.month(yy, mm))


# Python program to display the Fibonacci sequence up to n-th term using recursive functions

def recur_fibo(n):
   """Recursive function to
   print Fibonacci sequence"""
   if n <= 1:
       return n
   else:
       return(recur_fibo(n-1) + recur_fibo(n-2))


#to take input from the user
nterms = int(input("How many terms? "))

# check if the number of terms is valid
if nterms <= 0:
   print("Plese enter a positive integer")
else:
   print("Fibonacci sequence:")
   for i in range(nterms):
       print(recur_fibo(i))

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21

22

23

# Python program to display the Fibonacci sequence up to n-th term using recursive functions

def recur_fibo(n):

"""Recursive function to

print Fibonacci sequence"""

if n <= 1:

return n

else:

return(recur_fibo(n-1) + recur_fibo(n-2))

#to take input from the user

nterms = int(input("How many terms? "))

# check if the number of terms is valid

if nterms <= 0:

print("Plese enter a positive integer")

else:

print("Fibonacci sequence:")

for i in range(nterms):

print(recur_fibo(i))


# Python program to find the sum of natural numbers up to n using recursive function

def recur_sum(n):
   """Function to return the sum
   of natural numbers using recursion"""
   if n <= 1:
       return n
   else:
       return n + recur_sum(n-1)

#to take input from the user
num = int(input("Enter a number: "))

if num < 0:
   print("Enter a positive number")
else:
   print("The sum is",recur_sum(num))

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

# Python program to find the sum of natural numbers up to n using recursive function

def recur_sum(n):

"""Function to return the sum

of natural numbers using recursion"""

if n <= 1:

return n

else:

return n + recur_sum(n-1)

#to take input from the user

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

if num < 0:

print("Enter a positive number")

else:

print("The sum is",recur_sum(num))


# Python program to find the factorial of a number using recursion

def recur_factorial(n):
   """Function to return the factorial
   of a number using recursion"""
   if n == 1:
       return n
   else:
       return n*recur_factorial(n-1)

#to take input from the user
num = int(input("Enter a number: "))

# check is the number is negative
if num < 0:
   print("Sorry, factorial does not exist for negative numbers")
elif num == 0:
   print("The factorial of 0 is 1")
else:
   print("The factorial of",num,"is",recur_factorial(num))

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21

22

# Python program to find the factorial of a number using recursion

def recur_factorial(n):

"""Function to return the factorial

of a number using recursion"""

if n == 1:

return n

else:

return n*recur_factorial(n-1)

#to take input from the user

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

# check is the number is negative

if num < 0:

print("Sorry, factorial does not exist for negative numbers")

elif num == 0:

print("The factorial of 0 is 1")

else:

print("The factorial of",num,"is",recur_factorial(num))


def convertToBinary(n):
   # Function to print binary number for the input decimal using recursion
   if n > 1:
       convertToBinary(n//2)
   print(n % 2,end = '')

# decimal number
dec = int(input("Enter a number:"))

convertToBinary(dec)

1

2

3

4

5

6

7

8

9

10

11

12

def convertToBinary(n):

# Function to print binary number for the input decimal using recursion

if n > 1:

convertToBinary(n//2)

print(n % 2,end = '')

# decimal number

dec = int(input("Enter a number:"))

convertToBinary(dec)


# Program to add two matrices using nested loop

X = [[5, 7, 13],
    [41, 5, 16],
    [47, 5, 19]]

Y = [[5 ,5 ,1],
    [6  ,4 ,3],
    [4  ,4 ,9]]

result = [[0,0,0],
         [0,0,0],
         [0,0,0]]

# iterate through rows
for i in range(len(X)):
   # iterate through columns
   for j in range(len(X[0])):
       result[i][j] = X[i][j] + Y[i][j]

for r in result:
   print(r)

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21

22

23

24

# Program to add two matrices using nested loop

X = [[5, 7, 13],

[41, 5, 16],

[47, 5, 19]]

Y = [[5 ,5 ,1],

[6 ,4 ,3],

[4 ,4 ,9]]

result = [[0,0,0],

[0,0,0],

[0,0,0]]

# iterate through rows

for i in range(len(X)):

# iterate through columns

for j in range(len(X[0])):

result[i][j] = X[i][j] + Y[i][j]

for r in result:

print(r)


# Program to transpose a matrix using nested loop

X = [[12,7],
    [42 ,5],
    [32 ,8]]

result = [[0,0,0],
         [0,0,0]]

# iterate through rows
for i in range(len(X)):
   # iterate through columns
   for j in range(len(X[0])):
       result[j][i] = X[i][j]

for r in result:
   print(r)

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

# Program to transpose a matrix using nested loop

X = [[12,7],

[42 ,5],

[32 ,8]]

result = [[0,0,0],

[0,0,0]]

# iterate through rows

for i in range(len(X)):

# iterate through columns

for j in range(len(X[0])):

result[j][i] = X[i][j]

for r in result:

print(r)


# Program to multiply two matrices using nested loops

# 3x3 matrix
X = [[12,7,3],
    [4 ,5,6],
    [7 ,8,9]]
# 3x4 matrix
Y = [[5,8,1,2],
    [6,7,3,0],
    [4,5,9,1]]
# result is 3x4
result = [[0,0,0,0],
         [0,0,0,0],
         [0,0,0,0]]

# iterate through rows of X
for i in range(len(X)):
   # iterate through columns of Y
   for j in range(len(Y[0])):
       # iterate through rows of Y
       for k in range(len(Y)):
           result[i][j] += X[i][k] * Y[k][j]

for r in result:
   print(r)

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21

22

23

24

25

26

27

# Program to multiply two matrices using nested loops

# 3x3 matrix

X = [[12,7,3],

[4 ,5,6],

[7 ,8,9]]

# 3x4 matrix

Y = [[5,8,1,2],

[6,7,3,0],

[4,5,9,1]]

# result is 3x4

result = [[0,0,0,0],

[0,0,0,0],

[0,0,0,0]]

# iterate through rows of X

for i in range(len(X)):

# iterate through columns of Y

for j in range(len(Y[0])):

# iterate through rows of Y

for k in range(len(Y)):

result[i][j] += X[i][k] * Y[k][j]

for r in result:

print(r)


# Program to check if a string
#  is palindrome or not

# change this value for a different output
my_str = 'ababa'

# make it suitable for caseless comparison
my_str = my_str.casefold()

# reverse the string
rev_str = reversed(my_str)

# check if the string is equal to its reverse
if list(my_str) == list(rev_str):
   print(my_str," is palindrome")
else:
   print(my_str," is not palindrome")

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

# Program to check if a string

# is palindrome or not

# change this value for a different output

my_str = 'ababa'

# make it suitable for caseless comparison

my_str = my_str.casefold()

# reverse the string

rev_str = reversed(my_str)

# check if the string is equal to its reverse

if list(my_str) == list(rev_str):

print(my_str," is palindrome")

else:

print(my_str," is not palindrome")


# define punctuation
punctuations = '''!()-[]{};:'"\,<>./?@#$%^&*_~'''


# To take input from the user
my_str = input("Enter a string: ")

# remove punctuation from the string
no_punct = ""
for char in my_str:
   if char not in punctuations:
       no_punct = no_punct + char

# display the unpunctuated string
print(no_punct)

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

# define punctuation

punctuations = '''!()-[]{};:'"\,<>./?@#$%^&*_~'''

# To take input from the user

my_str = input("Enter a string: ")

# remove punctuation from the string

no_punct = ""

for char in my_str:

if char not in punctuations:

no_punct = no_punct + char

# display the unpunctuated string

print(no_punct)


# Program to sort alphabetically the words form a string provided by the user


#to take input from the user
my_str = input("Enter a string: ")

# breakdown the string into a list of words
words = my_str.split()

# sort the list
words.sort()

# display the sorted words

print("The sorted words are:")
for word in words:
   print(word)

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

# Program to sort alphabetically the words form a string provided by the user

#to take input from the user

my_str = input("Enter a string: ")

# breakdown the string into a list of words

words = my_str.split()

# sort the list

words.sort()

# display the sorted words

print("The sorted words are:")

for word in words:

print(word)


# Program to perform different set operations like in mathematics

# define three sets
E = {0, 2, 4, 6, 8};
N = {1, 2, 3, 4, 5};

# set union
print("Union of E and N is",E | N)

# set intersection
print("Intersection of E and N is",E & N)

# set difference
print("Difference of E and N is",E - N)

# set symmetric difference
print("Symmetric difference of E and N is",E ^ N)

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

# Program to perform different set operations like in mathematics

# define three sets

E = {0, 2, 4, 6, 8};

N = {1, 2, 3, 4, 5};

# set union

print("Union of E and N is",E | N)

# set intersection

print("Intersection of E and N is",E & N)

# set difference

print("Difference of E and N is",E - N)

# set symmetric difference

print("Symmetric difference of E and N is",E ^ N)


# Program to count the number of each vowel in a string

# string of vowels
vowels = 'aeiou'

#to take input from the user
ip_str = input("Enter a string: ")

# make it suitable for caseless comparisions
ip_str = ip_str.casefold()

# make a dictionary with each vowel a key and value 0
count = {}.fromkeys(vowels,0)

# count the vowels
for char in ip_str:
   if char in count:
       count[char] += 1

print(count)

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21

22

# Program to count the number of each vowel in a string

# string of vowels

vowels = 'aeiou'

#to take input from the user

ip_str = input("Enter a string: ")

# make it suitable for caseless comparisions

ip_str = ip_str.casefold()

# make a dictionary with each vowel a key and value 0

count = {}.fromkeys(vowels,0)

# count the vowels

for char in ip_str:

if char in count:

count[char] += 1

print(count)

Python Programs for Practice

How to Print “Hello World!” in Python

How to Add Two Variables in Python

How to Find the Square Root in Python

How to Calculate the Area of a Triangle in Python

How to Calculate the Area of a Circle in Python

How to Solve Quadratic Equation in Python

How to Swap Two Variables in Python

How to Generate a Random Number in Python

How to Convert Kilometers to Miles in Python

How to Convert Celsius To Fahrenheit in Python

How to Find the Sum of Numbers in a List in Python

How to to Check if a Number is Positive, Negative or 0 in Python

How to Check if a Number is Odd or Even in Python

How to Check Leap Year in Python

How to Find the Largest Among Three Numbers in Python

How to Check Prime Number in Python

How to Print all Prime Numbers in an Interval in Python

How to Find the Factorial of a Number in Python

How to Display the multiplication Table in Python

How to Print the Fibonacci sequence in Python

How to Check Armstrong Number in Python

How to Find Armstrong Number in an Interval in Python

How to Find the Sum of Natural Numbers in Python

How to Display Powers of 2 Using Anonymous Function in Python

How to Find Numbers Divisible by Another Number in Python

How to Convert Decimal to Binary, Octal and Hexadecimal in Python

How to Find ASCII Value of Character in Python

How to Find HCF or GCD in Python

How to Find LCM in Python

How to Find Factors of Number in Python

How to Make a Simple Calculator in Python

How to Display Calendar in Python

How to Display Fibonacci Sequence Using Recursion in Python

How to Find Sum of Natural Numbers Using Recursion in Python

How to Find Factorial of Number Using Recursion in Python

How to Convert Decimal to Binary Using Recursion in Python

How to Add Two Matrices in Python

How to Transpose a Matrix in Python

How to Multiply Two Matrices in Python

How to Check Whether a String is Palindrome or Not in Python

How to Remove Punctuations From a String in Python

How to Sort Words in Alphabetic Order in Python

How to Illustrate Different Set Operations in Python

How to Count the Number of Each Vowel in Python

You may also like

Leave a Comment X