core.builtin_trap

Module: core.builtin_trap

Inheritance diagram for IPython.core.builtin_trap:

A context manager for managing things injected into __builtin__.

Authors:

• Brian Granger
• Fernando Perez

BuiltinTrap

class IPython.core.builtin_trap.BuiltinTrap(shell=None)

Bases: IPython.config.configurable.Configurable

__init__(shell=None)

activate()

Store ipython references in the __builtin__ namespace.

add_builtin(key, value)

Add a builtin and save the original.

classmethod class_config_section()

Get the config class config section

classmethod class_get_help()

Get the help string for this class in ReST format.

classmethod class_get_trait_help(trait)

Get the help string for a single trait.

classmethod class_print_help()

Get the help string for a single trait and print it.

classmethod class_trait_names(**metadata)

Get a list of all the names of this classes traits.

This method is just like the trait_names() method, but is unbound.

classmethod class_traits(**metadata)

Get a list of all the traits of this class.

This method is just like the traits() method, but is unbound.

The TraitTypes returned don’t know anything about the values that the various HasTrait’s instances are holding.

This follows the same algorithm as traits does and does not allow for any simple way of specifying merely that a metadata name exists, but has any value. This is because get_metadata returns None if a metadata key doesn’t exist.

config

A trait whose value must be an instance of a specified class.

The value can also be an instance of a subclass of the specified class.

created = None

deactivate()

Remove any builtins which might have been added by add_builtins, or restore overwritten ones to their previous values.

on_trait_change(handler, name=None, remove=False)

Setup a handler to be called when a trait changes.

This is used to setup dynamic notifications of trait changes.

Static handlers can be created by creating methods on a HasTraits subclass with the naming convention ‘_[traitname]_changed’. Thus, to create static handler for the trait ‘a’, create the method _a_changed(self, name, old, new) (fewer arguments can be used, see below).

Parameters :

handler : callable

A callable that is called when a trait changes. Its signature can be handler(), handler(name), handler(name, new) or handler(name, old, new).

name : list, str, None

If None, the handler will apply to all traits. If a list of str, handler will apply to all names in the list. If a str, the handler will apply just to that name.

remove : bool

If False (the default), then install the handler. If True then unintall it.

remove_builtin(key)

Remove an added builtin and re-set the original.

shell

A trait whose value must be an instance of a specified class.

The value can also be an instance of a subclass of the specified class.

trait_metadata(traitname, key)

Get metadata values for trait by key.

trait_names(**metadata)

Get a list of all the names of this classes traits.

traits(**metadata)

Get a list of all the traits of this class.

The TraitTypes returned don’t know anything about the values that the various HasTrait’s instances are holding.

This follows the same algorithm as traits does and does not allow for any simple way of specifying merely that a metadata name exists, but has any value. This is because get_metadata returns None if a metadata key doesn’t exist.