Added ycrv command (#2203)

openbb_terminal/economy/economy_api.py

@@ -32,6 +32,7 @@ from .econdb_view import show_treasuries as treasury
 from .econdb_view import show_treasury_maturities as maturities
 from .yfinance_view import show_indices as index
 from .yfinance_view import search_indices as search_index
+from .investingcom_view import display_yieldcurve as ycrv
 
 # Models
 models = _models(os.path.abspath(os.path.dirname(__file__)))

openbb_terminal/stocks/quantitative_analysis/beta_model.py

@@ -1,3 +1,4 @@
+from typing import Tuple
 import pandas as pd
 from scipy import stats
 from openbb_terminal.stocks import stocks_helper
@@ -8,7 +9,7 @@ def beta_model(
     ref_ticker: str,
     stock: pd.DataFrame = None,
     ref: pd.DataFrame = None,
-) -> tuple[pd.Series, pd.Series, float, float]:
+) -> Tuple[pd.Series, pd.Series, float, float]:
     """Calculate beta for a ticker and a reference ticker.
 
     Parameters