code: def rev_est(self) -> pd.DataFrame:
      if self._rev_est is None:
          raise YFNotImplementedError("rev_est")
      return self._rev_est
  
file_path: yfinance/yfinance/scrapers/analysis.py
imports: import pandas
  from yfinance.data import YfData
  from yfinance.exceptions import YFNotImplementedError
label_desc: Use image node_id 5 for calling the Analysis obj's underlying member method code with example usage: obj.rev_est() and returns: self