python中反射用法实例

本文实例讲述了python中反射用法。分享给大家供大家参考。具体如下：

    import sys, types,new
    def _get_mod(modulePath):
      try:
        aMod = sys.modules[modulePath]
        if not isinstance(aMod, types.ModuleType):
          raise KeyError
      except KeyError:
        # The last [''] is very important!
        aMod = __import__(modulePath, globals(), locals(), [''])
        sys.modules[modulePath] = aMod
      return aMod
    def _get_func(fullFuncName):
      """Retrieve a function object from a full dotted-package name."""
      # Parse out the path, module, and function
      lastDot = fullFuncName.rfind(u".")
      funcName = fullFuncName[lastDot + 1:]
      modPath = fullFuncName[:lastDot]
      aMod = _get_mod(modPath)
      aFunc = getattr(aMod, funcName)
      # Assert that the function is a *callable* attribute.
      assert callable(aFunc), u"%s is not callable." % fullFuncName
      # Return a reference to the function itself,
      # not the results of the function.
      return aFunc
    def _get_Class(fullClassName, parentClass=None):
      """Load a module and retrieve a class (NOT an instance).
      If the parentClass is supplied, className must be of parentClass
      or a subclass of parentClass (or None is returned).
      """
      aClass = _get_func(fullClassName)
      # Assert that the class is a subclass of parentClass.
      if parentClass is not None:
        if not issubclass(aClass, parentClass):
          raise TypeError(u"%s is not a subclass of %s" %
                  (fullClassName, parentClass))
      # Return a reference to the class itself, not an instantiated object.
      return aClass
    def applyFuc(obj,strFunc,arrArgs):
      objFunc = getattr(obj, strFunc)
      return apply(objFunc,arrArgs)
    def getObject(fullClassName):
      clazz = _get_Class(fullClassName)
      return clazz()
    if __name__=='__main__':
      aa=getObject("inetservices.services.company.Company")  
      bb=applyFuc(aa, "select", ['select * from ngsys2',None])
      print bb

希望本文所述对大家的Python程序设计有所帮助。