BrianObject class

(Shortest import: from brian2 import BrianObject)

class brian2.core.base.BrianObject(**kwds)[source]

Bases: brian2.core.names.Nameable

All Brian objects derive from this class, defines magic tracking and update.

See the documentation for Network for an explanation of which objects get updated in which order.

Attributes

`_clock`	The clock used for simulating this object
`_creation_stack`	A string indicating where this object was created (traceback with any parts of Brian code removed)
`_network`	Used to remember the `Network` in which this object has been included before, to raise an error if it is included in a new `Network`
`_scope_current_key`	Global key value for ipython cell restrict magic
`_scope_key`	The scope key is used to determine which objects are collected by magic
`active`	Whether or not the object should be run.
`add_to_magic_network`	Whether or not the object should be added to a `MagicNetwork`.
`clock`	The `Clock` determining when the object should be updated.
`code_objects`	The list of `CodeObject` contained within the `BrianObject`.
`contained_objects`	The list of objects contained within the `BrianObject`.
`invalidates_magic_network`	Whether or not `MagicNetwork` is invalidated when a new `BrianObject` of this type is added
`name`	The unique name for this object.
`namespace`	The group-specific namespace
`order`	The order in which objects with the same clock and `when` should be updated
`updaters`	The list of `Updater` that define the runtime behaviour of this object.
`when`	The ID string determining when the object should be updated in `Network.run`.

Methods

`add_dependency`(obj)	Add an object to the list of dependencies.
`after_run`()	Optional method to do work after a run is finished.
`before_run`(run_namespace)	Optional method to prepare the object before a run.
`run`()

Details

_clock: The clock used for simulating this object

_creation_stack: A string indicating where this object was created (traceback with any parts of Brian code removed)

_network: Used to remember the Network in which this object has been included before, to raise an error if it is included in a new Network

_scope_current_key: Global key value for ipython cell restrict magic

_scope_key: The scope key is used to determine which objects are collected by magic

active

Whether or not the object should be run.

Inactive objects will not have their update method called in Network.run. Note that setting or unsetting the active attribute will set or unset it for all contained_objects.

add_to_magic_network: Whether or not the object should be added to a MagicNetwork. Note that all objects in BrianObject.contained_objects are automatically added when the parent object is added, therefore e.g. NeuronGroup should set add_to_magic_network to True, but it should not be set for all the dependent objects such as StateUpdater

clock

The Clock determining when the object should be updated.

Note that this cannot be changed after the object is created.

code_objects

The list of CodeObject contained within the BrianObject.

TODO: more details.

Note that this attribute cannot be set directly, you need to modify the underlying list, e.g. obj.code_objects.extend([A, B]).

contained_objects

The list of objects contained within the BrianObject.

When a BrianObject is added to a Network, its contained objects will be added as well. This allows for compound objects which contain a mini-network structure.

Note that this attribute cannot be set directly, you need to modify the underlying list, e.g. obj.contained_objects.extend([A, B]).

invalidates_magic_network: Whether or not MagicNetwork is invalidated when a new BrianObject of this type is added

name

The unique name for this object.

Used when generating code. Should be an acceptable variable name, i.e. starting with a letter character and followed by alphanumeric characters and _.

namespace: The group-specific namespace

order: The order in which objects with the same clock and when should be updated

updaters

The list of Updater that define the runtime behaviour of this object.

TODO: more details.

Note that this attribute cannot be set directly, you need to modify the underlying list, e.g. obj.updaters.extend([A, B]).

when: The ID string determining when the object should be updated in Network.run.

add_dependency(obj)[source]: Add an object to the list of dependencies. Takes care of handling subgroups correctly (i.e., adds its parent object).

after_run()[source]

Optional method to do work after a run is finished.

Called by Network.after_run after the main simulation loop terminated.

before_run(run_namespace)[source]

Optional method to prepare the object before a run.

Called by Network.after_run before the main simulation loop starts.

run()[source]