feat: add __getitem__ to ListMaker

Author: chilango74

main.py

@@ -2,5 +2,7 @@
 
 al = ok.AssetList(['SPY.US', ok.Portfolio()])
 
+print(al[0].symbol)
+
 for a in al:
     print(a.symbol)

okama/common/make_asset_list.py

@@ -101,6 +101,9 @@ def __repr__(self):
     def __len__(self):
         return len(self.symbols)
 
+    def __getitem__(self, item):
+        return list(self.asset_obj_dict.values())[item]
+
     def _make_list(self, ls: list, first_date, last_date) -> dict:
         """
         Make an asset list from a list of symbols.
@@ -264,7 +267,7 @@ def _get_single_asset_dividends(self, tick: str, remove_forecast: bool = True) -
         if asset.currency != self.currency:
             s = self._adjust_price_to_currency_monthly(s, asset.currency)
         if remove_forecast:
-            s = s[: pd.Period.now(freq="M")]
+            s = s[: pd.Period.now(freq="M")]  # Period.now() must be without arguments to be compatible with pandas 2.0
         # Create time series with zeros to pad the empty spaces in dividends time series
         index = pd.date_range(start=self.first_date, end=self.last_date, freq="MS")  # 'MS' to include the last period
         period = index.to_period("M")