parameters: (self)
docstring: Returns whether or not pre-releases as a whole are allowed by this
  
          specifier.
function: def prereleases(self):
  
          # type: () -> Optional[bool]
  
          """
  
          Returns whether or not pre-releases as a whole are allowed by this
  
          specifier.
  
          """
function_tokens: def prereleases ( self ) : # type: () -> Optional[bool]