start and end

portfolyo/core/pfline/classes.py

@@ -95,6 +95,16 @@ def index(self) -> pd.DatetimeIndex:
         """Index of the data, containing the left-bound timestamps of the delivery periods."""
         return self.df.index
 
+    @property
+    def start(self) -> pd.Timestamp:
+        """Start (incl) of the portfolio line."""
+        return self.df.index[0]
+
+    @property
+    def end(self) -> pd.Timestamp:
+        """End (excl) of the portfolio line."""
+        return tools.right.index(self.df.index)[-1]
+
     @property
     @abc.abstractmethod
     def w(self) -> pd.Series:

portfolyo/tools/right.py

@@ -7,7 +7,7 @@
 from . import freq as tools_freq
 
 
-def stamp(ts: pd.Timestamp, freq: str = None) -> pd.Timestamp:
+def stamp(ts: pd.Timestamp, freq: str) -> pd.Timestamp:
     f"""Right-bound timestamp belonging to left-bound timestamp.
 
     Parameters