如何导入__init__.py中定义的类

1. “

   lib/

   的父目录必须是

   sys.path

   。

2. 您的“

   lib/__init__.py

   ”可能看起来像这样：

   from . import settings # or just 'import settings' on old Python versions

   class Helper(object):
   pass
   

然后，以下示例应该起作用：

from lib.settings import Valuesfrom lib import Helper

回答问题的编辑版本：

__init__.py

Helper

settings.py

Helper

lib/helper.py

。| `-import_submodule.py    `-lib    |-__init__.py    |-foo    | |-__init__.py    | `-someobject.py    |-helper.py    `-settings.py2个目录，6个文件

命令：

$ python import_submodule.py

输出：

settingshelperHelper in lib.settingssomeobjectHelper in lib.foo.someobject# ./import_submodule.pyimport fnmatch, osfrom lib.settings import Valuesfrom lib import Helperprintfor root, dirs, files in os.walk('.'):    for f in fnmatch.filter(files, '*.py'):        print "# %s/%s" % (os.path.basename(root), f)        print open(os.path.join(root, f)).read()        print# lib/helper.pyprint 'helper'class Helper(object):    def __init__(self, module_name):        print "Helper in", module_name# lib/settings.pyprint "settings"import helperclass Values(object):    passhelper.Helper(__name__)# lib/__init__.py#from __future__ import absolute_importimport settings, foo.someobject, helperHelper = helper.Helper# foo/someobject.pyprint "someobject"from .. import helperhelper.Helper(__name__)# foo/__init__.pyimport someobject