Reflection usage instance in python and python usage instance

Reflection usage instance in python and python usage instance

This example describes the reflection usage in python. Share it with you for your reference. The details are as follows:

import sys, types,newdef _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 aModdef _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 aFuncdef _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 aClassdef 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

I hope this article will help you with Python programming.