code: def on_server_loaded(server_context):
      print("\nLoading data from Yahoo finance...", end="")
  
      for ticker in TICKERS:
          df = web.DataReader(
              ticker, "yahoo", start="2020-09-01", end="2022-09-01"
          )
          df["Returns"] = df["Close"].diff()
          setattr(server_context, ticker, df)
  
      print("DONE!\n")
  
label_desc: Use image node_id 1 for calling a global function with example usage: on_server_loaded(server_context) without return types