code: def get_data_home(path=None):
      
      if path is None:
          path = os.environ.get('YELLOWBRICK_DATA', FIXTURES)
  
      path = os.path.expanduser(path)
      path = os.path.expandvars(path)
  
      if not os.path.exists(path):
          os.makedirs(path)
  
      return path
docs: Return the path of the Yellowbrick data directory. This folder is used by
      dataset loaders to avoid downloading data several times.
  
      By default, this folder is colocated with the code in the install directory
      so that data shipped with the package can be easily located. Alternatively
      it can be set by the YELLOWBRICK_DATA environment variable, or
      programmatically by giving a folder path. Note that the '~' symbol is
      expanded to the user home directory, and environment variables are also
      expanded when resolving the path.