code: def set_data_dir(path=None, store=None):
      
      import sys
      import os
      import pysat
      if sys.version_info[0] >= 3:
          if sys.version_info[1] < 4:
              import imp
              re_load = imp.reload
          else:
              import importlib
              re_load = importlib.reload
      else:
          re_load = reload
      if store is None:
          store = True    
      if os.path.isdir(path):
          if store:
              with open(os.path.join(os.path.expanduser('~'), '.pysat',
                                     'data_path.txt'), 'w') as f:
                  f.write(path)
          pysat.data_dir = path
          pysat._files = re_load(pysat._files)
          pysat._instrument = re_load(pysat._instrument)
      else:
          raise ValueError('Path %s does not lead to a valid directory.' % path)
docs: Set the top level directory pysat uses to look for data and reload.
  
      Parameters
      ----------
      path : string
          valid path to directory pysat uses to look for data
      store : bool
          if True, store data directory for future runs