code: def ensure_data_root(environ=None):
      """
      Ensure that the data root exists.
      """
      ensure_directory(data_root(environ=environ))
  
file_path: zipline/zipline/utils/paths.py
imports: from errno import EEXIST
  import os
  from os.path import exists, expanduser, join
  import pandas
label_desc: Use image node_id 12 for calling a global function with example usage: ensure_data_root(environ) without return types