'Return all available local variable names beginning with expr'

def _comment_variables_from_scope(self, expr, scoperef):

    (blob, lpath) = scoperef
    scope_chain = ('locals',)
    vars = self._element_names_from_scope_starting_with_expr(None, scoperef, 'variable', scope_chain, self.variable_names_from_elem)
    expr = expr[:1]
    return [(ilk, name) for (ilk, name) in vars if name.startswith(expr)]
