parameters: (self,item)
docstring: Returns the index at which the item is found or raises an exception
docstring_summary: Returns the index at which the item is found or raises an exception
docstring_tokens: Returns the index at which the item is found or raises an exception
function: def index(self,item):
          """Returns the index at which the item is found or raises an exception"""
          if self._seq is not None:
              return self._seq.index(item)
          raise ValueError(str(item)+" is not in the sequence")
function_tokens: def index ( self , item ) : if self . _seq is not None : return self . _seq . index ( item ) raise ValueError ( str ( item ) + " is not in the sequence" )