Manage namespace in python maya.

from maya import cmds

# Filter reserved namespaces
# these namespaces can not be touched they are always there
_ignored_namespaces = ('UI', 'shared')

def get_namespaces(ignored_namespace=_ignored_namespaces):
    """Get namespace.

    :param ignored_namespace: Tuple of ignored namespace.
    :type ignored_namespace: tuple[str]
    """
    cmds.namespace(setNamespace="::")
    namespaces_raw = cmds.namespaceInfo(listOnlyNamespaces=True, recurse=True)

    # Filter reserved namespaces
    # these namespaces can not be touched they are always there
    namespaces = filter(lambda x: x not in ignored_namespace, namespaces_raw)
    return namespaces

def remove_namespaces(namespaces, ignored_namespace=_ignored_namespaces):
    """Remove namespace.
    
    :param ignored_namespace: 
    :return: 
    """
    cmds.namespace(setNamespace="::")
    namespaces_raw = cmds.namespaceInfo(listOnlyNamespaces=True, recurse=True)

    namespaces = filter(lambda x: x not in _ignored_namespaces, namespaces_raw)

    for namespace in reversed(sorted(namespaces)):
        cmds.namespace(moveNamespace=(namespace, ':'), force=True)
        # Remove the namespace to free the group name we want.
        cmds.namespace(removeNamespace=namespace, mergeNamespaceWithRoot=True)