code: def _check_ne_builtin_clash(expr):
      
      names = expr.names
      overlap = names & _ne_builtins
  
      if overlap:
          s = ', '.join(map(repr, overlap))
          raise NumExprClobberingError('Variables in expression "{expr}" '
                                       'overlap with builtins: ({s})'
                                       .format(expr=expr, s=s))
docs: Attempt to prevent foot-shooting in a helpful way.
  
      Parameters
      ----------
      terms : Term
          Terms can contain