parameters: (p)
docstring: expression : NAME
docstring_summary: expression : NAME
docstring_tokens: expression : NAME
function: def p_expression_name(p):
      'expression : NAME'
      try:
          p[0] = names[p[1]]
      except LookupError:
          print "Undefined name '%s'" % p[1]
          p[0] = 0
function_tokens: def p_expression_name ( p ) : try : p [ 0 ] = names [ p [ 1 ] ] except LookupError : print "Undefined name '%s'" % p [ 1 ] p [ 0 ] = 0