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5.2 The `del` statement

There is a way to remove an item from a list given its index instead of its value: the `del` statement. This can also be used to remove slices from a list (which we did earlier by assignment of an empty list to the slice). For example:

      >>> a
      [-1, 1, 66.6, 333, 333, 1234.5]
      >>> del a[0]
      >>> a
      [1, 66.6, 333, 333, 1234.5]
      >>> del a[2:4]
      >>> a
      [1, 66.6, 1234.5]

`del` can also be used to delete entire variables:

      >>> del a

Referencing the name `a` hereafter is an error (at least until another value is assigned to it). We'll find other uses for `del` later.