docs: def get_modules(pkg_name, module_filter = None):
      """
          返回包中所有符合条件的模块。
  
          参数:
              pkg_name        包名称
              module_filter   模块名过滤器 def (module_name)
      """
      path = app_path(pkg_name)
      #py_filter = lambda f: all((fnmatch(f, "*.py"), not f.startswith("__"), module_filter and module_filter(f) or True))
      py_filter = lambda f: all((fnmatch(f, "*.pyc") or fnmatch(f, "*.py"), not f.startswith("__"), module_filter and module_filter(f) or True))
      names = [splitext(n)[0] for n in os.listdir(path) if py_filter(n)]
      return [__import__("{0}.{1}".format(pkg_name, n)).__dict__[n] for n in names]