NameError: name 'variable' is not defined, 如何在try/except语句的finally块中处理和异常

Question

I am a bit new in python, and have just learned about the try except else and finally statement.

try: 
   x=int(input("enter a number:")
except:
   print("you entered a wrong type of input, make sure to enter an integer value")
else:
   print(f"running in else : {x}")
finally: 
   print(f"finally : {x+2}")

This will cause another exception in finally block NameError name 'x' is not defined if I enter anything other than an integer value in my input statement

Does it mean we have to put all that is related to x in the else block and all that have nothing to do with x, in the finally block?

My actual script is very long but I'm trying to understand this concept from a smaller example

Is this a right intuition?

Please suggest me if otherwise

Answer 1

I am inclined to think that you would want to give the user a second chance, and a third, and...

So why not wrap it in a while-loop to enforce the presence of an x which is an integer at the end:

x=None
while x is None:
    try: 
       x=int(input("enter a number:"))
    except ValueError:
       print(f"You entered a wrong type of input, make sure to enter an integer value")

Answer 2

Finally blocks executes No matter what (unless you destory the laptop/PC).

No matter what happened previously, the final-block is executed once the code block is complete and any raised exceptions handled. Even if there's an error in an exception handler or the else-block and a new exception is raised, the code in the final-block is still run.

But, In this case you can use flags inside the final statement.

final = True  #Flag true 

try: 
   x=int(input("enter a number:"))
except:
   print("you entered a wrong type of input, make sure to enter an integer value")
   final = False  #Flase if except
      
else:
   print(f"running in else : {x}")
finally:
   if final:
       
       print(f"finally : {x+2}")