"""
Base class for PyTables nodes
=============================
:Author: Ivan Vilata i Balaguer
:Contact: ivan@selidor.net
:Created: 2005-02-11
:License: BSD
:Revision: $Id: node.py 3848 2008-10-28 16:28:22Z faltet $
Classes:
`Node`
Abstract base class for all PyTables nodes.
Misc variables:
`__docformat__`
The format of documentation strings in this module.
`__version__`
Repository version of this file.
"""
import warnings
from tables.registry import classNameDict,classIdDict
from tables.exceptions import \
ClosedNodeError, NodeError, UndoRedoWarning, PerformanceWarning
from tables.path import joinPath,splitPath,isVisiblePath
from tables.utils import lazyattr
from tables.undoredo import moveToShadow
from tables.attributeset import AttributeSet,NotLoggedAttributeSet
__docformat__ = 'reStructuredText'
"""The format of documentation strings in this module."""
__version__ = '$Revision: 3848 $'
"""Repository version of this file."""
def _closedrepr(oldmethod):
"""
Decorate string representation method to handle closed nodes.
If the node is closed, a string like this is returned::
<closed MODULE.CLASS at ADDRESS>
instead of calling `oldmethod` and returning its result.
"""
def newmethod(self):
if not self._v_isopen:
cmod = self.__class__.__module__
cname = self.__class__.__name__
addr = hex(id(self))
return '<closed %s.%s at %s>' % (cmod, cname, addr)
return oldmethod(self)
newmethod.__name__ = oldmethod.__name__
newmethod.__doc__ = oldmethod.__doc__
return newmethod
class MetaNode(type):
"""
Node metaclass.
This metaclass ensures that their instance classes get registered
into several dictionaries (namely the `tables.utils.classNameDict`
class name dictionary and the `tables.utils.classIdDict` class
identifier dictionary).
It also adds sanity checks to some methods:
* Check that the node is open when calling string representation
and provide a default string if so.
"""
def __new__(class_, name, bases, dict_):
# Add default behaviour for representing closed nodes.
for mname in ['__str__', '__repr__']:
if mname in dict_:
dict_[mname] = _closedrepr(dict_[mname])
return type.__new__(class_, name, bases, dict_)
def __init__(class_, name, bases, dict_):
super(MetaNode, class_).__init__(name, bases, dict_)
# Always register into class name dictionary.
classNameDict[class_.__name__] = class_
# Register into class identifier dictionary only if the class
# has an identifier and it is different from its parents'.
cid = getattr(class_, '_c_classId', None)
if cid is not None:
for base in bases:
pcid = getattr(base, '_c_classId', None)
if pcid == cid:
break
else:
classIdDict[cid] = class_
class Node(object):
"""
Abstract base class for all PyTables nodes.
This is the base class for *all* nodes in a PyTables hierarchy.
It is an abstract class, i.e. it may not be directly instantiated;
however, every node in the hierarchy is an instance of this class.
A PyTables node is always hosted in a PyTables *file*, under a
*parent group*, at a certain *depth* in the node hierarchy. A node
knows its own *name* in the parent group and its own *path name* in
the file.
All the previous information is location-dependent, i.e. it may
change when moving or renaming a node in the hierarchy. A node also
has location-independent information, such as its *HDF5 object
identifier* and its *attribute set*.
This class gathers the operations and attributes (both
location-dependent and independent) which are common to all PyTables
nodes, whatever their type is. Nonetheless, due to natural naming
restrictions, the names of all of these members start with a
reserved prefix (see the `Group` class).
Sub-classes with no children (i.e. *leaf nodes*) may define new
methods, attributes and properties to avoid natural naming
restrictions. For instance, ``_v_attrs`` may be shortened to
``attrs`` and ``_f_rename`` to ``rename``. However, the original
methods and attributes should still be available.
Public instance variables -- location dependent
-----------------------------------------------
_v_depth
The depth of this node in the tree (an non-negative integer
value).
_v_file
The hosting `File` instance.
_v_name
The name of this node in its parent group (a string).
_v_parent
The parent `Group` instance.
_v_pathname
The path of this node in the tree (a string).
Public instance variables -- location independent
-------------------------------------------------
_v_attrs
The associated `AttributeSet` instance.
_v_isopen
Whether this node is open or not.
_v_objectID
A node identifier (may change from run to run).
Public instance variables -- attribute shorthands
-------------------------------------------------
_v_title
A description of this node. A shorthand for the ``TITLE``
attribute.
Public methods -- hierarchy manipulation
----------------------------------------
_f_close()
Close this node in the tree.
_f_copy([newparent][, newname][, overwrite][, recursive][, createparents][, **kwargs])
Copy this node and return the new one.
_f_isVisible()
Is this node visible?
_f_move([newparent][, newname][, overwrite])
Move or rename this node.
_f_remove([recursive])
Remove this node from the hierarchy.
_f_rename(newname[, overwrite])
Rename this node in place.
Public methods -- attribute handling
------------------------------------
_f_delAttr(name)
Delete a PyTables attribute from this node.
_f_getAttr(name)
Get a PyTables attribute from this node.
_f_setAttr(name, value)
Set a PyTables attribute for this node.
"""
# This makes this class and all derived subclasses be handled by MetaNode.
__metaclass__ = MetaNode
# By default, attributes accept Undo/Redo.
_AttributeSet = AttributeSet
# <properties>
# `_v_parent` is accessed via its file to avoid upwards references.
def _g_getparent(self):
(parentPath, nodeName) = splitPath(self._v_pathname)
return self._v_file._getNode(parentPath)
_v_parent = property(
_g_getparent, None, None, "The parent `Group` instance.")
# '_v_attrs' is defined as a lazy read-only attribute.
# This saves 0.7s/3.8s.
@lazyattr
def _v_attrs(self):
"""The associated `AttributeSet` instance."""
return self._AttributeSet(self)
# '_v_title' is a direct read-write shorthand for the 'TITLE' attribute
# with the empty string as a default value.
def _g_gettitle (self):
if hasattr(self._v_attrs, 'TITLE'):
return self._v_attrs.TITLE
else:
return ''
def _g_settitle (self, title):
self._v_attrs.TITLE = title
_v_title = property(_g_gettitle, _g_settitle, None,
"A description of this node.")
# </properties>
# This may be looked up by ``__del__`` when ``__init__`` doesn't get
# to be called. See ticket #144 for more info.
_v_isopen = False
"""The default class attribute for _v_isopen."""
# The ``_log`` argument is only meant to be used by ``_g_copyAsChild()``
# to avoid logging the creation of children nodes of a copied sub-tree.
def __init__(self, parentNode, name, _log=True):
# Remember to assign these values in the root group constructor
# as it does not use this method implementation!
self._v_file = None
"""The hosting `File` instance."""
self._v_isopen = False
"""Whether this node is open or not."""
self._v_pathname = None
"""The path of this node in the tree (a string)."""
self._v_name = None
"""The name of this node in its parent group (a string)."""
self._v_depth = None
"""The depth of this node in the tree (an non-negative integer value)."""
self._v_maxTreeDepth = parentNode._v_file.params['MAX_TREE_DEPTH']
"""Maximum tree depth before warning the user."""
self._v__deleting = False
"""Is the node being deleted?"""
self._v_objectID = None
"""A node identifier (may change from run to run)."""
validate = new = self._v_new # set by subclass constructor
# Is the parent node a group? Is it open?
self._g_checkGroup(parentNode)
parentNode._g_checkOpen()
file_ = parentNode._v_file
# Will the file be able to host a new node?
if new:
file_._checkWritable()
# Bind to the parent node and set location-dependent information.
if new:
# Only new nodes need to be referenced.
# Opened nodes are already known by their parent group.
parentNode._g_refNode(self, name, validate)
self._g_setLocation(parentNode, name)
try:
# hdf5Extension operations:
# Update node attributes.
self._g_new(parentNode, name, init=True)
# Create or open the node and get its object ID.
if new:
self._v_objectID = self._g_create()
else:
self._v_objectID = self._g_open()
# The node *has* been created, log that.
if new and _log and file_.isUndoEnabled():
self._g_logCreate()
# This allows extra operations after creating the node.
self._g_postInitHook()
except:
# If anything happens, the node must be closed
# to undo every possible registration made so far.
# We do *not* rely on ``__del__()`` doing it later,
# since it might never be called anyway.
self._f_close()
raise
def _g_logCreate(self):
self._v_file._log('CREATE', self._v_pathname)
def __del__(self):
# Closed `Node` instances can not be killed and revived.
# Instead, accessing a closed and deleted (from memory, not
# disk) one yields a *new*, open `Node` instance. This is
# because of two reasons:
#
# 1. Predictability. After closing a `Node` and deleting it,
# only one thing can happen when accessing it again: a new,
# open `Node` instance is returned. If closed nodes could be
# revived, one could get either a closed or an open `Node`.
#
# 2. Ease of use. If the user wants to access a closed node
# again, the only condition would be that no references to
# the `Node` instance were left. If closed nodes could be
# revived, the user would also need to force the closed
# `Node` out of memory, which is not a trivial task.
#
if not self._v_isopen:
return # the node is already closed or not initialized
# If we get here, the `Node` is still open.
file_ = self._v_file
if self._v_pathname in file_._aliveNodes:
# If the node is alive, kill it (to save it).
file_._killNode(self)
elif file_._aliveNodes.hasdeadnodes:
# The node is already dead and there are no references to it,
# so follow the usual deletion procedure.
# This means closing the (still open) node.
# `self._v__deleting` is asserted so that the node
# does not try to unreference itself again from the file.
self._v__deleting = True
self._f_close()
def _g_preKillHook(self):
"""Code to be called before killing the node."""
pass
def _g_postReviveHook(self):
"""Code to be called after reviving the node."""
pass
def _g_create(self):
"""Create a new HDF5 node and return its object identifier."""
raise NotImplementedError
def _g_open(self):
"""Open an existing HDF5 node and return its object identifier."""
raise NotImplementedError
def _g_checkOpen(self):
"""
Check that the node is open.
If the node is closed, a `ClosedNodeError` is raised.
"""
if not self._v_isopen:
raise ClosedNodeError("the node object is closed")
assert self._v_file.isopen, "found an open node in a closed file"
def _g_setLocation(self, parentNode, name):
"""
Set location-dependent attributes.
Sets the location-dependent attributes of this node to reflect
that it is placed under the specified `parentNode`, with the
specified `name`.
This also triggers the insertion of file references to this
node. If the maximum recommended tree depth is exceeded, a
`PerformanceWarning` is issued.
"""
file_ = parentNode._v_file
parentDepth = parentNode._v_depth
self._v_file = file_
self._v_isopen = True
rootUEP = file_.rootUEP
if name.startswith(rootUEP):
# This has been called from File._getNode()
assert parentDepth == 0
if rootUEP == "/":
self._v_pathname = name
else:
self._v_pathname = name[len(rootUEP):]
_, self._v_name = splitPath(name)
self._v_depth = name.count("/") - rootUEP.count("/") + 1
else:
# If we enter here is because this has been called elsewhere
self._v_name = name
self._v_pathname = joinPath(parentNode._v_pathname, name)
self._v_depth = parentDepth + 1
# Check if the node is too deep in the tree.
if parentDepth >= self._v_maxTreeDepth:
warnings.warn("""\
node ``%s`` is exceeding the recommended maximum depth (%d);\
be ready to see PyTables asking for *lots* of memory and possibly slow I/O"""
% (self._v_pathname, self._v_maxTreeDepth),
PerformanceWarning)
file_._refNode(self, self._v_pathname)
def _g_updateLocation(self, newParentPath):
"""
Update location-dependent attributes.
Updates location data when an ancestor node has changed its
location in the hierarchy to `newParentPath`. In fact, this
method is expected to be called by an ancestor of this node.
This also triggers the update of file references to this node.
If the maximum recommended node depth is exceeded, a
`PerformanceWarning` is issued. This warning is assured to be
unique.
"""
oldPath = self._v_pathname
newPath = joinPath(newParentPath, self._v_name)
newDepth = newPath.count('/')
self._v_pathname = newPath
self._v_depth = newDepth
# Check if the node is too deep in the tree.
if newDepth > self._v_maxTreeDepth:
warnings.warn("""\
moved descendent node is exceeding the recommended maximum depth (%d);\
be ready to see PyTables asking for *lots* of memory and possibly slow I/O"""
% (self._v_maxTreeDepth,), PerformanceWarning)
file_ = self._v_file
file_._unrefNode(oldPath)
file_._refNode(self, newPath)
# Tell dependent objects about the new location of this node.
self._g_updateDependent()
def _g_delLocation(self):
"""
Clear location-dependent attributes.
This also triggers the removal of file references to this node.
"""
file_ = self._v_file
pathname = self._v_pathname
self._v_file = None
self._v_isopen = False
self._v_pathname = None
self._v_name = None
self._v_depth = None
# If the node object is being deleted,
# it has already been unreferenced from the file.
if not self._v__deleting:
file_._unrefNode(pathname)
def _g_postInitHook(self):
"""Code to be run after node creation and before creation logging."""
pass
def _g_updateDependent(self):
"""
Update dependent objects after a location change.
All dependent objects (but not nodes!) referencing this node
must be updated here.
"""
if '_v_attrs' in self.__dict__:
self._v_attrs._g_updateNodeLocation(self)
def _f_close(self):
"""
Close this node in the tree.
This releases all resources held by the node, so it should not
be used again. On nodes with data, it may be flushed to disk.
You should not need to close nodes manually because they are
automatically opened/closed when they are loaded/evicted from
the integrated LRU cache.
"""
# After calling ``_f_close()``, two conditions are met:
#
# 1. The node object is detached from the tree.
# 2. *Every* attribute of the node is removed.
#
# Thus, cleanup operations used in ``_f_close()`` in sub-classes
# must be run *before* calling the method in the superclass.
if not self._v_isopen:
return # the node is already closed
myDict = self.__dict__
# Close the associated `AttributeSet`
# only if it has already been placed in the object's dictionary.
if '_v_attrs' in myDict:
self._v_attrs._g_close()
# Detach the node from the tree if necessary.
self._g_delLocation()
# Finally, clear all remaining attributes from the object.
myDict.clear()
# Just add a final flag to signal that the node is closed:
self._v_isopen = False
def _g_remove(self, recursive):
"""
Remove this node from the hierarchy.
If the node has children, recursive removal must be stated by
giving `recursive` a true value; otherwise, a `NodeError` will
be raised.
It does not log the change.
"""
# Remove the node from the PyTables hierarchy.
parent = self._v_parent
parent._g_unrefNode(self._v_name)
# Close the node itself.
self._f_close()
# hdf5Extension operations:
# Remove the node from the HDF5 hierarchy.
self._g_delete(parent)
def _f_remove(self, recursive=False):
"""
Remove this node from the hierarchy.
If the node has children, recursive removal must be stated by
giving `recursive` a true value, or a `NodeError` will be
raised.
"""
self._g_checkOpen()
file_ = self._v_file
file_._checkWritable()
if file_.isUndoEnabled():
self._g_removeAndLog(recursive)
else:
self._g_remove(recursive)
def _g_removeAndLog(self, recursive):
file_ = self._v_file
oldPathname = self._v_pathname
# Log *before* moving to use the right shadow name.
file_._log('REMOVE', oldPathname)
moveToShadow(file_, oldPathname)
def _g_move(self, newParent, newName):
"""
Move this node in the hierarchy.
Moves the node into the given `newParent`, with the given
`newName`.
It does not log the change.
"""
oldParent = self._v_parent
oldName = self._v_name
oldPathname = self._v_pathname # to move the HDF5 node
# Try to insert the node into the new parent.
newParent._g_refNode(self, newName)
# Remove the node from the new parent.
oldParent._g_unrefNode(oldName)
# Remove location information for this node.
self._g_delLocation()
# Set new location information for this node.
self._g_setLocation(newParent, newName)
# hdf5Extension operations:
# Update node attributes.
self._g_new(newParent, self._v_name, init=False)
# Move the node.
#self._v_parent._g_moveNode(oldPathname, self._v_pathname)
self._v_parent._g_moveNode(oldParent._v_objectID, oldName,
newParent._v_objectID, newName,
oldPathname, self._v_pathname)
# Tell dependent objects about the new location of this node.
self._g_updateDependent()
def _f_rename(self, newname, overwrite=False):
"""
Rename this node in place.
Changes the name of a node to `newname` (a string). If a node
with the same `newname` already exists and `overwrite` is true,
recursively remove it before renaming.
"""
self._f_move(newname=newname, overwrite=overwrite)
def _f_move( self, newparent=None, newname=None,
overwrite=False, createparents=False ):
"""
Move or rename this node.
Moves a node into a new parent group, or changes the name of the
node. `newparent` can be a `Group` object or a pathname in
string form. If it is not specified or ``None`` , the current
parent group is chosen as the new parent. `newname` must be a
string with a new name. If it is not specified or ``None``, the
current name is chosen as the new name. If `createparents` is
true, the needed groups for the given new parent group path to
exist will be created.
Moving a node across databases is not allowed, nor it is moving
a node *into* itself. These result in a `NodeError`. However,
moving a node *over* itself is allowed and simply does nothing.
Moving over another existing node is similarly not allowed,
unless the optional `overwrite` argument is true, in which case
that node is recursively removed before moving.
Usually, only the first argument will be used, effectively
moving the node to a new location without changing its name.
Using only the second argument is equivalent to renaming the
node in place.
"""
self._g_checkOpen()
file_ = self._v_file
oldParent = self._v_parent
oldName = self._v_name
# Set default arguments.
if newparent is None and newname is None:
raise NodeError( "you should specify at least "
"a ``newparent`` or a ``newname`` parameter" )
if newparent is None:
newparent = oldParent
if newname is None:
newname = oldName
# Get destination location.
if hasattr(newparent, '_v_file'): # from node
newfile = newparent._v_file
newpath = newparent._v_pathname
elif hasattr(newparent, 'startswith'): # from path
newfile = file_
newpath = newparent
else:
raise TypeError( "new parent is not a node nor a path: %r"
% (dstParent,) )
# Validity checks on arguments.
# Is it in the same file?
if newfile is not file_:
raise NodeError( "nodes can not be moved across databases; "
"please make a copy of the node" )
# The movement always fails if the hosting file can not be modified.
file_._checkWritable()
# Moving over itself?
oldPath = oldParent._v_pathname
if newpath == oldPath and newname == oldName:
# This is equivalent to renaming the node to its current name,
# and it does not change the referenced object,
# so it is an allowed no-op.
return
# Moving into itself?
self._g_checkNotContains(newpath)
# Note that the previous checks allow us to go ahead and create
# the parent groups if `createparents` is true. `newparent` is
# used instead of `newpath` to avoid accepting `Node` objects
# when `createparents` is true.
newparent = file_._getOrCreatePath(newparent, createparents)
self._g_checkGroup(newparent) # Is it a group?
# Moving over an existing node?
self._g_maybeRemove(newparent, newname, overwrite)
# Move the node.
oldPathname = self._v_pathname
self._g_move(newparent, newname)
# Log the change.
if file_.isUndoEnabled():
self._g_logMove(oldPathname)
def _g_logMove(self, oldPathname):
self._v_file._log('MOVE', oldPathname, self._v_pathname)
def _g_copy(self, newParent, newName, recursive, _log=True, **kwargs):
"""
Copy this node and return the new one.
Creates and returns a copy of the node in the given `newParent`,
with the given `newName`. If `recursive` copy is stated, all
descendents are copied as well. Additional keyword argumens may
affect the way that the copy is made. Unknown arguments must be
ignored. On recursive copies, all keyword arguments must be
passed on to the children invocation of this method.
If `_log` is false, the change is not logged. This is *only*
intended to be used by ``_g_copyAsChild()`` as a means of
optimising sub-tree copies.
"""
raise NotImplementedError
def _g_copyAsChild(self, newParent, **kwargs):
"""
Copy this node as a child of another group.
Copies just this node into `newParent`, not recursing children
nor overwriting nodes nor logging the copy. This is intended to
be used when copying whole sub-trees.
"""
return self._g_copy( newParent, self._v_name,
recursive=False, _log=False, **kwargs )
def _f_copy(self, newparent=None, newname=None,
overwrite=False, recursive=False, createparents=False,
**kwargs):
"""
Copy this node and return the new one.
Creates and returns a copy of the node, maybe in a different
place in the hierarchy. `newparent` can be a `Group` object or
a pathname in string form. If it is not specified or ``None``,
the current parent group is chosen as the new parent. `newname`
must be a string with a new name. If it is not specified or
``None``, the current name is chosen as the new name. If
`recursive` copy is stated, all descendents are copied as well.
If `createparents` is true, the needed groups for the given
new parent group path to exist will be created.
Copying a node across databases is supported but can not be
undone. Copying a node over itself is not allowed, nor it is
recursively copying a node into itself. These result in a
`NodeError`. Copying over another existing node is similarly
not allowed, unless the optional `overwrite` argument is true,
in which case that node is recursively removed before copying.
Additional keyword arguments may be passed to customize the
copying process. For instance, title and filters may be
changed, user attributes may be or may not be copied, data may
be subsampled, stats may be collected, etc. See the
documentation for the particular node type.
Using only the first argument is equivalent to copying the node
to a new location without changing its name. Using only the
second argument is equivalent to making a copy of the node in
the same group.
"""
self._g_checkOpen()
srcFile = self._v_file
srcParent = self._v_parent
srcName = self._v_name
dstParent = newparent
dstName = newname
# Set default arguments.
if dstParent is None and dstName is None:
raise NodeError( "you should specify at least "
"a ``newparent`` or a ``newname`` parameter" )
if dstParent is None:
dstParent = srcParent
if dstName is None:
dstName = srcName
# Get destination location.
if hasattr(dstParent, '_v_file'): # from node
dstFile = dstParent._v_file
dstPath = dstParent._v_pathname
elif hasattr(dstParent, 'startswith'): # from path
dstFile = srcFile
dstPath = dstParent
else:
raise TypeError( "new parent is not a node nor a path: %r"
% (dstParent,) )
# Validity checks on arguments.
if dstFile is srcFile:
# Copying over itself?
srcPath = srcParent._v_pathname
if dstPath == srcPath and dstName == srcName:
raise NodeError(
"source and destination nodes are the same node: ``%s``"
% self._v_pathname )
# Recursively copying into itself?
if recursive:
self._g_checkNotContains(dstPath)
# Note that the previous checks allow us to go ahead and create
# the parent groups if `createparents` is true. `dstParent` is
# used instead of `dstPath` because it may be in other file, and
# to avoid accepting `Node` objects when `createparents` is
# true.
dstParent = srcFile._getOrCreatePath(dstParent, createparents)
self._g_checkGroup(dstParent) # Is it a group?
# Copying to another file with undo enabled?
dolog = True
if dstFile is not srcFile and srcFile.isUndoEnabled():
warnings.warn( "copying across databases can not be undone "
"nor redone from this database",
UndoRedoWarning )
dolog = False
# Copying over an existing node?
self._g_maybeRemove(dstParent, dstName, overwrite)
# Copy the node.
# The constructor of the new node takes care of logging.
return self._g_copy(dstParent, dstName, recursive, **kwargs)
def _f_isVisible(self):
"""Is this node visible?"""
self._g_checkOpen()
return isVisiblePath(self._v_pathname)
def _g_checkGroup(self, node):
# Node must be defined in order to define a Group.
# However, we need to know Group here.
# Using classNameDict avoids a circular import.
if not isinstance(node, classNameDict['Node']):
raise TypeError("new parent is not a registered node: %s"
% node._v_pathname)
if not isinstance(node, classNameDict['Group']):
raise TypeError("new parent node ``%s`` is not a group"
% node._v_pathname)
def _g_checkNotContains(self, pathname):
# The not-a-TARDIS test. ;)
mypathname = self._v_pathname
if ( mypathname == '/' # all nodes fall below the root group
or pathname == mypathname
or pathname.startswith(mypathname + '/') ):
raise NodeError(
"can not move or recursively copy node ``%s`` into itself"
% mypathname )
def _g_maybeRemove(self, parent, name, overwrite):
if name in parent:
if not overwrite:
raise NodeError("""\
destination group ``%s`` already has a node named ``%s``; \
you may want to use the ``overwrite`` argument""" % (parent._v_pathname, name))
parent._f_getChild(name)._f_remove(True)
def _g_checkName(self, name):
"""
Check validity of name for this particular kind of node.
This is invoked once the standard HDF5 and natural naming checks
have successfully passed.
"""
if name.startswith('_i_'):
# This is reserved for table index groups.
raise ValueError(
"node name starts with reserved prefix ``_i_``: %s" % name)
# <attribute handling>
def _f_getAttr(self, name):
"""
Get a PyTables attribute from this node.
If the named attribute does not exist, an `AttributeError` is
raised.
"""
return getattr(self._v_attrs, name)
def _f_setAttr(self, name, value):
"""
Set a PyTables attribute for this node.
If the node already has a large number of attributes, a
`PerformanceWarning` is issued.
"""
setattr(self._v_attrs, name, value)
def _f_delAttr(self, name):
"""
Delete a PyTables attribute from this node.
If the named attribute does not exist, an `AttributeError` is
raised.
"""
delattr(self._v_attrs, name)
# </attribute handling>
class NotLoggedMixin:
# Include this class in your inheritance tree
# to avoid changes to instances of your class from being logged.
_AttributeSet = NotLoggedAttributeSet
def _g_logCreate(self):
pass
def _g_logMove(self, oldPathname):
pass
def _g_removeAndLog(self, recursive):
self._g_remove(recursive)
## Local Variables:
## mode: python
## py-indent-offset: 4
## tab-width: 4
## fill-column: 72
## End:
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