Merge pull request #15895 from anntzer/depr-unused-attr

jklymak · web-flow · commit 9fe5f5b9d29d · 2019-12-13T19:59:51.000-08:00
Deprecate unused illegal_s attribute.
diff --git a/doc/api/next_api_changes/deprecations.rst b/doc/api/next_api_changes/deprecations.rst
@@ -59,3 +59,7 @@ Passing raw data via parameters *data* and *lut* to `.register_cmap()` is
 deprecated. Instead, explicitly create a `.LinearSegmentedColormap` and pass
 it via the *cmap* parameter:
 ``register_cmap(cmap=LinearSegmentedColormap(name, data, lut))``.
+
+``DateFormatter.illegal_s``
+~~~~~~~~~~~~~~~~~~~~~~~~~~~
+This attribute is unused and deprecated.
diff --git a/lib/matplotlib/dates.py b/lib/matplotlib/dates.py
@@ -572,7 +572,10 @@ class DateFormatter(ticker.Formatter):
     `~datetime.datetime.strftime` format string.
     """
 
-    illegal_s = re.compile(r"((^|[^%])(%%)*%s)")
+    @cbook.deprecated("3.3")
+    @property
+    def illegal_s(self):
+        return re.compile(r"((^|[^%])(%%)*%s)")
 
     def __init__(self, fmt, tz=None):
         """
