Code for random number generator

Code/calculator.py

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+# 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")

Code/palindrome.py

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+# function which return reverse of a string
+def reverse(s):
+    return s[::-1]
+
+def isPalindrome(s):
+    # Calling reverse function
+    rev = reverse(s)
+
+    # Checking if both string are equal or not
+    if (s == rev):
+        return True
+    return False
+
+
+# Driver code
+s = raw_input("Enter the string:")
+ans = isPalindrome(s)
+
+if ans == 1:
+    print("Yes")
+else:
+    print("No")

Code/primeNumber.py

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+# Python program to check if the input number is prime or not
+
+num = 407
+
+# take input from the user
+# 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")

Code/randomNumber.py

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+# Program to generate a random number between 0 and 9
+
+# import the random module
+import random
+
+print(random.randint(0,9))