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Conditional statements


Finally, we can also use the not operator to introduce negation:

user_input = input('Please enter a number: ')
if (not user_input.isnumeric()):
  print('This is not a number!')
  print('This is a correct number!')

The if code in the fragment above will be executed only if isnumeric() does not return True.


An Internet website has the following password policy for user accounts:

  1. passwords must be at least 8 characters long,
  2. passwords cannot start with the @ character.

Write a program that will ask the user for a password and will check whether it satisfies the conditions. If the conditions are met, write:

Correct password!

Otherwise, write:

Incorrect password!

Use the following two functions: len(string) and string.startswith('x').

Stuck? Here's a hint!

To check if the password is correct, use both and and not in the if statement.