CODEWITHSUNDEEP
python
shindonism
shindonism

Reputation: 19

Can I use errors as conditions for if..else statement in Python? If yes, how?

What I am planning is when the user inputs something that results to an error (in my code, is the eval() which will cause the error in the input), it loops back. 

while True:
  x = input('Enter price: ')
  y = eval(x)
  if y == #error condition
    print('Error! Please try again.')
    continue
  else:
    print(y)
    break

The output should be:

Enter price: +
Error! Please try again.
Enter price: 1+
Error! Please try again.
Enter price: 1+1
2

Is it possible? I am using Python 3.4 btw.

Upvotes: 1

Views: 1531

Answers (1)

Timo D
Timo D

Reputation: 1803

You can use the try ... except construct. It will catch Exceptions:

while True:
    x = input('Enter price: ')
    try:
        y = eval(x)
    except Exception:
        print('Error! Please try again.')
        continue

    print(y)
    break

Upvotes: 2

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