列表 5. 检测和安装以其类命名的 Mix-ins

from MixIn import MixIn
from glob import glob
import os
def MixInDir(dir):
    ''' Installs mix-ins found in the given directory.
          Each mix-in is expected to match the name
          of a class in our domain classes. '''
    path = os.path.join(basePath, '*.py')
    for filename in glob(path):
          dirname, name = os.path.split(filename)
          name = os.path.splitext(name)[0]
          # Get the real class
          module = __import__(name)
          pyClass = getattr(module, name)
          # Get the mix-in class
          results = {}
          exec open(filename) in results
          mixInClass = results[name]
          # Mix it in
          MixIn(pyClass, mixInClass)