Which of the following is true with regard to defensive programming? preconditions should never be visible to callers. program code frequently assumes that input will be valid and that algorithms will behave as expected. you should never guard assumptions. information hiding dictates that we never document assumptions.

Consider a list of full names formatted “firstname lastname”, like ["jules verne", "alexandre dumas", "maurice druon"]. write a list comprehension that produces a list with the full names in the format “lastname, firstname”. the resulting list should look like ['verne, jules', 'dumas, alexandre', 'druon, maurice']. the simplest solution may involve a nested comprehension: [ …. for … in [ … for … in … ]].