code: def find_dotenv(filename='.env', raise_error_if_not_found=False, usecwd=False):
      
      if usecwd or '__file__' not in globals():
          # should work without __file__, e.g. in REPL or IPython notebook
          path = os.getcwd()
      else:
          # will work for .py files
          frame_filename = sys._getframe().f_back.f_code.co_filename
          path = os.path.dirname(os.path.abspath(frame_filename))
  
      for dirname in _walk_to_root(path):
          check_path = os.path.join(dirname, filename)
          if os.path.exists(check_path):
              return check_path
  
      if raise_error_if_not_found:
          raise IOError('File not found')
  
      return ''
docs: Search in increasingly higher folders for the given file
  
      Returns path to the file if found, or an empty string otherwise