Prime number program :

number = int(input("enter a number : "))

prime = True 

for i in range(2 , 37) : 

    if (number%i == 0 ) : 
        prime = False
        break

if ( prime == True ) : 
    print("Is a prime number")

else : 
    print('Is not a prime number')

String formating

sentence = input("Enter sentence : ")

firstChar = True

for i in sentence : 
    if( i == " ") :
        firstChar = True 

    elif( firstChar == True ): 
        print(i.upper() , end ="")
        firstChar = False

    else:
        print(i , end = "")
        firstChar = False