parameters: (self, item, prereleases=None)
docstring: Determines if the given item is contained within this specifier.
docstring_summary: Determines if the given item is contained within this specifier.
docstring_tokens: Determines if the given item is contained within this specifier .
function: def contains(self, item, prereleases=None):
          # type: (str, Optional[bool]) -> bool
          """
          Determines if the given item is contained within this specifier.
          """
function_tokens: def contains ( self , item , prereleases = None ) : # type: (str, Optional[bool]) -> bool