@public decorator for adding names to _all_(common documentation)

 His module is a library that provides two simple decorators called @public
 and @private to document the publicity of names in your Python module. These
 decorators are used to control what will be imported when someone uses the
 from <module> import * statement. It's usually good practice to use a special
 attribute called __all__ to explicitly list the public names you want exposed
 in your module.
 .
 This package installs the common documentation package.