# 1.  import modulemodule.method()del module # get rid of the module name(name space)reload(module)# 2. import run.py dynamicallyimport imp, osm = imp.load_source('m', os.path.join(_casedir, 'run.py')) # 3.from module import methodmethod()# 4. import ctypesobj = ctypes.CDLL('XXX.dll')obj.func()   # func is in XXX.dll#如果dll不在搜索目录下， 则：sys.path.append(lib_path) # lib_path 是dll所在路径。os.environ["PATH"] = lib_path+ ";" + os.environ["PATH"]