#python program to print all prime numbers in given range

#take range as input from user

lower_range,upper_range = input("Enter range in format lower range,upper range: ").split(",")

try:

    lower_range=int(lower_range)

    upper_range=int(upper_range)

    # check if given range is valid

    if upper_range <= lower_range:

        print("invalid range")

    else:

        #2 is smallest prime number, hence there is no prime number below 2

        if upper_range in (0,1,2):

            print("there is no prime number below %d"%(upper_range))

        else:

            #print all prime numbers falling in given range

            print("all prime numbers between %d and %d are:"%(lower_range,upper_range))

            for j in range(lower_range,upper_range+1):

                count=0

                i=2

                while i<j:

                    if j % i == 0:

                        count += 1

                        i += 1

                    else:

                        i += 1

                #prime numbers are only divisble by 1 and the number itself        

                if count == 0:

                    print(j,end=" ")

                else:

                    continue

except:            

    print("---error---")

    print("please enter a valid input")

Enter range in format lower range,upper range: 5,80

all prime numbers between 5 and 80 are:

5 7 11 13 17 19 23 29 31 37 41 43 47 53 59 61 67 71 73 79 

 

Enter range in format lower range,upper range: 0,2

there is no prime number below 2

 

Enter range in format lower range,upper range: 55,30

invalid range