python动态加载包的方法详细介绍

stringmodule = __import__('string')

import imp 
stringmodule = imp.load_module('string',*imp.find_module('string'))
imp.load_source("TYACMgrHandler_"+app.upper(), filepath)

import_string = "import string as stringmodule"
exec import_string

class Obj(object):
  pass
def main():
  list=["a","b", "c"]
  for i inrange(1,len(list),2):
    Obj = type('Obj',(),{list[i]:lambdaself,s:obj.__setattr__(s.split(" = ")[0],s.split(" = ")[1])})
  obj =Obj()
  for i inrange(0,len(list),2):
    obj.__setattr__(list[i],list[i])  
  obj.a =1
  obj.b("a =2")
  obj.b("c =3")
  printobj.a
  printobj.c
if __name__ == '__main__':
  main()

def test(s,e):
  print s
  print e
class C():
  def __init__(self,name):
    print name
  def test(self):
    print 'class!!!'

class Dynload():
  def __init__(self,package,imp_list):
    self.package=package
    self.imp=imp_list
  def getobject(self):
    return __import__(self.package,globals(),locals(),self.imp,-1)
  def getClassInstance(self,classstr,*args):
    return getattr(self.getobject(),classstr)(*args)  
  def execfunc(self,method,*args):
    return getattr(self.getobject(),method)(*args)
  def execMethod(self,instance,method,*args):
    return getattr(instance,method)(*args)
#Test:
dyn=Dynload('util.common',['*'])
ins=dyn.getClassInstance('C','gao')
dyn.execMethod(ins,'test')
dyn.execfunc('test','Hello','function!')

def loadapp(self, app):
    filepath="mgr/"+app+".py"
    if os.path.exists(filepath):
      imp.load_source("TYACMgrHandler_"+app.upper(), filepath)
//修改了app.py，从新调用这个函数，新的代码自动生效

return getattr(self, op)(args.get("port"), args) //op="start" args=dict
getattr(self, self.request.method.lower())(*args, **kwargs)