use _holds_integer in plotting._core.py

Author: Terji Petersen

pandas/plotting/_core.py

@@ -939,15 +939,15 @@ def __call__(self, *args, **kwargs):
                         f"{kind} requires either y column or 'subplots=True'"
                     )
                 if y is not None:
-                    if is_integer(y) and data.columns._should_fallback_to_positional:
+                    if is_integer(y) and not data.columns._holds_integer():
                         y = data.columns[y]
                     # converted to series actually. copy to not modify
                     data = data[y].copy()
                     data.index.name = y
         elif isinstance(data, ABCDataFrame):
             data_cols = data.columns
             if x is not None:
-                if is_integer(x) and data.columns._should_fallback_to_positional:
+                if is_integer(x) and not data.columns._holds_integer():
                     x = data_cols[x]
                 elif not isinstance(data[x], ABCSeries):
                     raise ValueError("x must be a label or position")