<p>Python 2.7+,3.3+类mixin,它简化了子类中<em><uu dir</em>方法的实现。希望能有所帮助。<a href="https://gist.github.com/katyukha/c6e5e2b829e247c9b009" rel="nofollow">Gist</a>。</p>
<pre><code>import six
class DirMixIn:
""" Mix-in to make implementing __dir__ method in subclasses simpler
"""
def __dir__(self):
if six.PY3:
return super(DirMixIn, self).__dir__()
else:
# code is based on
# http://www.quora.com/How-dir-is-implemented-Is-there-any-PEP-related-to-that
def get_attrs(obj):
import types
if not hasattr(obj, '__dict__'):
return [] # slots only
if not isinstance(obj.__dict__, (dict, types.DictProxyType)):
raise TypeError("%s.__dict__ is not a dictionary"
"" % obj.__name__)
return obj.__dict__.keys()
def dir2(obj):
attrs = set()
if not hasattr(obj, '__bases__'):
# obj is an instance
if not hasattr(obj, '__class__'):
# slots
return sorted(get_attrs(obj))
klass = obj.__class__
attrs.update(get_attrs(klass))
else:
# obj is a class
klass = obj
for cls in klass.__bases__:
attrs.update(get_attrs(cls))
attrs.update(dir2(cls))
attrs.update(get_attrs(obj))
return list(attrs)
return dir2(self)
</code></pre>