annotation

Author: jbrockmendel

pandas/plotting/_matplotlib/timeseries.py

@@ -307,7 +307,7 @@ def maybe_convert_index(ax: Axes, data: NDFrameT) -> NDFrameT:
 # Patch methods for subplot.
 
 
-def _format_coord(freq, t, y) -> str:
+def _format_coord(freq: BaseOffset, t, y) -> str:
     time_period = Period(ordinal=int(t), freq=freq)
     return f"t = {time_period}  y = {y:8f}"