How to restart a python program ?

How to restart a python program also
if there is any way i can ask the user to type in the correct inputs

Answered by Kopamed [earned 5 cycles]

Voters

Comments

hot new top

Not number:

while True:
    answer = input("Yes or no?(y/n)")

    if answer.lower() == "y" or answer.lower() == "n":
        break

For numbers:

while True:
    try:
        age = int(input("How old are you?"))
        break
    except:
        print("I said your age, not your great-grand-auntie's dog's name!")

@Kopamed i do understand your hardwork to this but i cannot understand any of this ......cuz am a newbie

and what does .lower() mean??

@TejasvMaheshwar
imagine you have a variable

a_string = "HeLlO"

when you add .lower() to a, all the letters in that string become lower cased. .upper() does the opposite - alll letters will be upper case

@Kopamed thanks a lot sir

@Kopamed what the use of break?

@TejasvMaheshwar No problem dude

@TejasvMaheshwar It stops a

while

loop

@Kopamed
if answer.lower() == n
then how to restart the program again?

@TejasvMaheshwar for which purpose do you need to restart the project?

@TejasvMaheshwar I see you are making a calculator. I made a unbreakable calculator a while back. If you want to see how it works, tell me

@Kopamed see am making a calci if someone types in like abcd in instead of typing in an number i want the program the to restart till the correct input is been made

also it would be really helpful if you can share some sort of id through which i can contact you .....gmail would work

@TejasvMaheshwar You dont want the program to restart. Wait like 30 mins, ill send you my version of the calculator

@TejasvMaheshwar Unhackabla calc

@Kopamed am intrested .....tell everything about it

@Kopamed thanks

@Kopamed thanks again sir

@Kopamed print("{0} + {1} = {2}".format(num1, num2, (num1+num2)))

whats this format thing......explain please

https://repl.it/@TejasvMaheshwar/[email protected] why is this not restarting like yours???

@TejasvMaheshwar line 21 should be

if Stop.lower() == "n":

if Stop == "N" or Stop == "n":

@Kopamed Dude you're awesomeee......Thankkkkk youuuuu

@TejasvMaheshwar Have I given the right answer. If not, find the person which has given you the answer and mark their answer is correct to inform people that this question has been answered. (You mark the answer as correct by clicking on the tick mark on the left of the answer)

CircuitSacul

@Kopamed You should specify the exception type, like this:

except TypeError:

@LD1 Ok

I see that people have answered your second question, but not the first. I don't think that there is a way to restart a python program from within the file, unless you put it in a function and just told it to re-run the function, then break the original, like this:

def main():
    #main code here
    #to "restart" program:
    main() #this just re-runs the program that is currently running
    exit() #this tells the python program to stop completely

main()

If you need a better example just let me know

Edit #1:
I just noticed that when you except an error, you also re-run the function. This is not necessary because it is in a while loop and will re-run by itself.

except:
      print("Invalid input, Try Again")

not

except:
      print("Invalid input, Try Again")
      calc()

HackermonDev

You can use try and except. Learn more here: https://www.w3schools.com/python/python_try_except.asp

@PDanielY Thanks

thanks

Profile icon

[deleted]

See this, https://blog.petrzemek.net/2014/03/23/restarting-a-python-script-within-itself/

sir i appreciate your help.....but i cant understand any of it since am a newbie @johno1566

NarwhalFanatic

You could do print("You must type a number between 1 and 2")

@NarwhalFanatic What if some lunatic types in a word instead of numbers....

NarwhalFanatic

@TejasvMaheshwar have in if statement that checks if their answer is an integer.