Error Handling

ERROR HANDLING

Error handling allows a script to continue running even if an error occurs.

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Common Built-in Exceptions

Examples of common errors in Python:

def woahhh()        # SyntaxError

1 + name            # NameError

5/0                 # ZeroDivisionError

li = [1, 2, 3]
li[5]               # IndexError

di = {'a': 1}
di['b']             # KeyError

Error Handling with

Try / Except / Else / Finally

• Blocks to handle errors gracefully.

• Can write this try, except, else block for whole file to avoid errors

• try → code that may cause an error

• except → handles specific errors
• else → runs if no error occurs
• finally → always runs, regardless of error

while True:
    try:                                            #if true print this
        age = int(input('Enter your age:' ))
        10/age
        raise ValueError('Hey, Cut it out!!!')      #shows errors to the user
                                                    #or raise Exception('hey cut it out')
    except ValueError:      #if an error print this, we can enter an error name to be specific
        print('please enter a valid number')
    except ZeroDivisionError:
        print('Enter value more than Zero')
    else:                   #to get out of loop
        print('thank you')
        break
    finally:
        print('ok, I am finally done')
    #Finally block of code that will always execute, regardless of whether an exception occurs or not.

Error Handling for Functions

• You can catch multiple exceptions in one block using parentheses and the as keyword.

def sum(num1, num2):
    try:
        return num1 + num2
    except (TypeError, ValueError, ZeroDivisionError) as error:
        print (error)

print(sum(1,3))     # Output: 4

Can add many error in one and use AS keyword and name a variable