A caching descriptor wrapper. Takes the attribute name and the wrapped descriptor as arguments.

To expire, use MyClass.cached_attr.expire(my_object) where my_object is an instance of MyClass.

This class contains 5 members.

Applies a FormEncode validator/converter to a descriptor. Supports both a class-level default_validator, and custom validators.

Subclasses (like json_converter) might set default_validator.

This class contains 5 members.

Calls a callback function with (obj, old_value, new_value) everytime an attribute is set.

You can listen before or after the value is actually set, with before_watcher and after_watcher. delete_watcher (if given) is called with (self, old_value) everytime an attribute is deleted, right before the delete.

This class contains 4 members.

Wraps a descriptor and does JSON decoding/encoding.

An underlying string shows up as the JSON it decodes to.

This class contains 5 members.

Wraps a descriptor, and splits/joins text lines.

An underlying string shows up as a list of strings split by line.

This class contains 5 members.