Class NodeError

tables/exceptions.py:261–278

Invalid hierarchy manipulation operation requested. This exception is raised when the user requests an operation on the hierarchy which can not be run because of the current layout of the tree. This includes accessing nonexistent nodes, moving or copying or creating over an existin

class NodeError(AttributeError, LookupError):
    """Invalid hierarchy manipulation operation requested.

    This exception is raised when the user requests an operation on the
    hierarchy which can not be run because of the current layout of the
    tree.  This includes accessing nonexistent nodes, moving or copying
    or creating over an existing node, non-recursively removing groups
    with children, and other similarly invalid operations.

    A node in a PyTables database cannot be simply overwritten by
    replacing it.  Instead, the old node must be removed explicitly
    before another one can take its place.  This is done to protect
    interactive users from inadvertently deleting whole trees of data by
    a single erroneous command.

    """

    pass


class NoSuchNodeError(NodeError):