The else block when catching exceptions in Python

You can also add a else block to the try-except construct. An important nuance is that the code placed in the else block will work if no exceptions were caught before it in try-except.

Let's say we have a list:

pythonlst = [1, 2, 3]

In the try-except construction, we will write an exception catch for a non-existent list element:

pythontry:
  print(lst[4])
except IndexError:
  print('error: elem is not exist')

Now let's specify in the else block the output of the sum of all elements of the list:

pythontry:
  print(lst[4])
except IndexError:
  print('error: elem is not exist')
else:
  print(sum(lst))

If the code in the try block refers to a missing element, an error message will appear in the console:

error'error: elem is not exist'

Now let's set the try block to output an element that is definitely in the list:

pythontry:
  print(lst[0])
except IndexError:
  print('error: elem is not exist')
else:
  print(sum(lst))

After executing the code, two numbers will appear in the console: the element specified in try and the sum of all elements of the list:

python1
6

pythonlst = [1, 2, 3]