osdir.com


[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Help a noob out


Den torsdag 2 maj 2019 kl. 11:43:53 UTC+2 skrev inhahe:
> On Thu, May 2, 2019 at 5:26 AM <felixen989 at hotmail.co.uk> wrote:
> 
> > Hey guys, can someone quickly explain why this piece of code doesn't work?
> > (I'm really new to Python)
> >
> > birth_year = input("What year are you born? ")
> > current_year = 2019
> > age = current_year - birth_year
> > print(age)
> > --
> > https://mail.python.org/mailman/listinfo/python-list
> 
> 
> input() returns a string. So the user enters "1978" for example but he
> could just have easily entered "Honda Civic". Python doesn't know to
> interpret it as a number in order to do arithmetic or it until you convert
> it to an integer.
> 
> birth_year = int(input("What year were you born?")) should work, unless I
> missed something else.
> 
> (the int() converts the string to an integer)
> 
> Maybe it would be more professional to do some error checking though, e.g.
> print that there was incorrect input and ask again if they didn't actually
> input an integer. You could do this using the try and except keywords (in
> some kind of loop), as int() raises an exception when the string you pass
> it isn't an actual integer.

Thank you for your responses. I managed to figure it all out with your guys help.