python中反射用法实例_Python

python中反射用法实例

2020-05-24 10:49songguo Python

这篇文章主要介绍了python中反射用法,实例分析了Python中反射的原理与使用技巧,具有一定参考借鉴价值,需要的朋友可以参考下

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：

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									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