code: def get_income_time_series(
      self, freq="yearly", proxy=None
  ) -> pd.DataFrame:
      res = self._income_time_series
      if freq not in res:
          res[freq] = self._fetch_time_series("income", freq, proxy)
      return res[freq]
  
file_path: yfinance/yfinance/scrapers/fundamentals.py
imports: import datetime
  import json
  import pandas
  from yfinance import utils, const
  from yfinance.data import YfData
  from yfinance.exceptions import YFinanceException, YFNotImplementedError
label_desc: Use image node_id 2 for calling the Financials obj's underlying member method code with example usage: obj.get_income_time_series(freq, proxy) and returns: res