[Python] getattr 的用途與應用

getattr(object, name[, default])

• 回傳物件裡的屬性
• Python的內建函數
• Example1
class Demo:
    def __init__(self):
            self.x = "demo_x"
            self.y = "demo_y"

    def test(self):
            print "demo_test"

demo = Demo()
print getattr(demo, "__init__")
print getattr(demo, "x")
print getattr(demo, "y")

執行結果

• Example2
  
  class WebService:
          def __init__(self):
                  self.demos = []
  
          def register(self, demo)
                  self.demos.append(demo)
  
          def exe(self, func):
                  for demo in demos.values():
                          function = getattr(demo, func)
                          return function(parms)
  
  class Demo():
  def _exe1(self, parms):
          print "_exe1: %s " % parms
  
  def _exe2(self, parms):
          print "_exe2: %s" % parms
  
  ws = WebService()
  ws.register(Demo())
  ws.exe('_exe1')

Reference:
[1] Python 3.1 快速導覽 - 內建函數 getattr()