diff --git a/pandas/util/_decorators.py b/pandas/util/_decorators.py
index 8fef3a231a748..571c065c53351 100644
--- a/pandas/util/_decorators.py
+++ b/pandas/util/_decorators.py
@@ -77,7 +77,7 @@ def wrapper(*args, **kwargs) -> Callable[..., Any]:
     if alternative.__doc__:
         if alternative.__doc__.count("\n") < 3:
             raise AssertionError(doc_error_msg)
-        empty1, summary, empty2, doc = alternative.__doc__.split("\n", 3)
+        empty1, summary, empty2, doc_string = alternative.__doc__.split("\n", 3)
         if empty1 or empty2 and not summary:
             raise AssertionError(doc_error_msg)
         wrapper.__doc__ = dedent(
@@ -87,7 +87,7 @@ def wrapper(*args, **kwargs) -> Callable[..., Any]:
         .. deprecated:: {version}
             {msg}
 
-        {dedent(doc)}"""
+        {dedent(doc_string)}"""
         )
     # error: Incompatible return value type (got "Callable[[VarArg(Any), KwArg(Any)],
     # Callable[...,Any]]", expected "Callable[[F], F]")
diff --git a/pandas/util/_doctools.py b/pandas/util/_doctools.py
index dc8a22b1fe0ef..6144d1a179828 100644
--- a/pandas/util/_doctools.py
+++ b/pandas/util/_doctools.py
@@ -167,7 +167,7 @@ def _make_table(self, ax, df, title: str, height: float | None = None) -> None:
         ax.axis("off")
 
 
-if __name__ == "__main__":
+def main() -> None:
     import matplotlib.pyplot as plt
 
     p = TablePlotter()
@@ -188,8 +188,12 @@ def _make_table(self, ax, df, title: str, height: float | None = None) -> None:
     idx = pd.MultiIndex.from_tuples(
         [(1, "A"), (1, "B"), (1, "C"), (2, "A"), (2, "B"), (2, "C")]
     )
-    col = pd.MultiIndex.from_tuples([(1, "A"), (1, "B")])
+    column = pd.MultiIndex.from_tuples([(1, "A"), (1, "B")])
     df3 = pd.DataFrame({"v1": [1, 2, 3, 4, 5, 6], "v2": [5, 6, 7, 8, 9, 10]}, index=idx)
-    df3.columns = col
+    df3.columns = column
     p.plot(df3, df3, labels=["df3"])
     plt.show()
+
+
+if __name__ == "__main__":
+    main()