Python input validation for both integer and string

Question

I'm new in programming and I have an issue when doing the input validation. My program requires to input number from 1 to 10 or the letter y but it seems that I cannot do an error handler for this.

def checkingInput():
 while True:
 try:
 a = input()
 if 10 >= a >= 1 or a == 'y':
 return value
 else:
 print('Invalid input!')
 except NameError:
 print('Name error!Please try again!')
 except SyntaxError:
 print('Syntax Error!Please try again!')

• jamylak: I presume you are using python 3 due to the print() but could you please confirm that?
• Ignacio Vazquez-Abrams: SyntaxError is not an exception that normally happens at runtime.
• jamylak: I think you want ValueError instead of SyntaxError. Also you can't compare ints with strings so you should change your line to if a == 'y' or 1 <= int(a) <= 10
• Antti Haapala: Also, if this is python 3 you do not need to catch NameError either

Answer 1

as jamylak suggested change the if condition to :

if a == 'y' or 1 <= int(a) <= 10:

program:

def checkingInput():
 while True:
 try:
 a = input('enter')
 if a == 'y' or 1 <= int(a) <= 10:
 return a
 else:
 print('Invalid input!')
 except ValueError:
 print('Value error! Please try again!')

• jamylak: doesn't work if a is 'y' since if statement checks conditions from left to right and won't be able to convert 'y' to int. Do this instead: if a == 'y' or 1 <= int(a) <= 10
• Ashwini Chaudhary: @jamylak Thanks, I really didn't knew that If uses left to right checking.
• jamylak: +1 Also i can't tell if that is sarcasm or not... If it is I'm sorry but I just thought it was worth explaining for other people reading this.
• Ashwini Chaudhary: @jamylak no that isn't sarcasm, it was helpful.
• Karl Knechtel: As an aside: proper style dictates a name of check_input - the punctuation (all lowercase with an underscore in between) is the preference of the Python community, but all programmers would prefer the name check over checking: since the function does something, give it a name that's imperative, rather than descriptive.