Optimize filtering of search results Now the Permission class constructor takes an optional argument 'filter'. Now if we do not find a permission on the whole class *and* all permission objects on the current class with a check method also have a filter method we can improve search performance by filtering in the database (instead of in python).

try:
    # Python 3+
    from ssl import SSLError
except (ImportError, AttributeError):
    # Python 2.5-2.7
    from socket import sslerror as SSLError  # noqa: F401