class_docstr: Helper Abstract Base Class which defines all methods that
  a StorageBackend must implement.
class_docstr_tok: ["Helper","Abstract","Base","Class","which","defines","all","methods","that","a","StorageBackend","must","implement","."]
docstr: Checks if an item location exists in the store.
  
  This method is private and only used by the StoreBackendMixin object.
  
  Parameters
  ----------
  location: string
      The location of an item. On a filesystem, this corresponds to the
      absolute path, including the filename, of a file.
  
  Returns
  -------
  True if the item exists, False otherwise
docstr_tok: ["Checks","if","an","item","location","exists","in","the","store",".","This","method","is","private","and","only","used","by","the","StoreBackendMixin","object",".","Parameters","--","--","--","--","--","location",":","string","The","location","of","an","item",".","On","a","filesystem",",","this","corresponds","to","the","absolute","path",",","including","the","filename",",","of","a","file",".","Returns","--","--","--","-","True","if","the","item","exists",",","False","otherwise"]
code: def _item_exists(self, location):
      """Checks if an item location exists in the store.
  
      This method is private and only used by the StoreBackendMixin object.
  
      Parameters
      ----------
      location: string
          The location of an item. On a filesystem, this corresponds to the
          absolute path, including the filename, of a file.
  
      Returns
      -------
      True if the item exists, False otherwise
      """
  
imports: from pickle import PicklingError
  import re
  import os
  import os.path
  import datetime
  import json
  import shutil
  import warnings
  import collections
  import operator
  import threading
  from abc import ABCMeta, abstractmethod
  from .backports import concurrency_safe_rename
  from .disk import mkdirp, memstr_to_bytes, rm_subdirs
  from .None import numpy_pickle
label_desc: Use image node_id 2 for calling the StoreBackendBase obj's underlying member method code with example usage: obj._item_exists(location) without return types