MNT: Remove deprecated widget properties

Author: greglucas

doc/api/next_api_changes/removals/23XXX-GL.rst

@@ -34,3 +34,9 @@ Passing a URL to `~.pyplot.imread()` has been removed. Please open the URL for
 reading and directly use the Pillow API
 (``PIL.Image.open(urllib.request.urlopen(url))``, or
 ``PIL.Image.open(io.BytesIO(requests.get(url).content))``) instead.
+
+Deprecated properties of widgets have been removed
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+These include ``cids``, ``cnt``, ``observers``, ``change_observers``,
+and ``submit_observers``.

lib/matplotlib/widgets.py

@@ -111,8 +111,6 @@ class AxesWidget(Widget):
         If False, the widget does not respond to events.
     """
 
-    cids = _api.deprecated("3.4")(property(lambda self: self._cids))
-
     def __init__(self, ax):
         self.ax = ax
         self.canvas = ax.figure.canvas
@@ -153,11 +151,6 @@ class Button(AxesWidget):
         The color of the button when hovering.
     """
 
-    cnt = _api.deprecated("3.4")(property(  # Not real, but close enough.
-        lambda self: len(self._observers.callbacks['clicked'])))
-    observers = _api.deprecated("3.4")(property(
-        lambda self: self._observers.callbacks['clicked']))
-
     def __init__(self, ax, label, image=None,
                  color='0.85', hovercolor='0.95'):
         """
@@ -323,11 +316,6 @@ class Slider(SliderBase):
         Slider value.
     """
 
-    cnt = _api.deprecated("3.4")(property(  # Not real, but close enough.
-        lambda self: len(self._observers.callbacks['changed'])))
-    observers = _api.deprecated("3.4")(property(
-        lambda self: self._observers.callbacks['changed']))
-
     def __init__(self, ax, label, valmin, valmax, valinit=0.5, valfmt=None,
                  closedmin=True, closedmax=True, slidermin=None,
                  slidermax=None, dragging=True, valstep=None,
@@ -989,11 +977,6 @@ class CheckButtons(AxesWidget):
         each box, but have ``set_visible(False)`` when its box is not checked.
     """
 
-    cnt = _api.deprecated("3.4")(property(  # Not real, but close enough.
-        lambda self: len(self._observers.callbacks['clicked'])))
-    observers = _api.deprecated("3.4")(property(
-        lambda self: self._observers.callbacks['clicked']))
-
     def __init__(self, ax, labels, actives=None):
         """
         Add check buttons to `matplotlib.axes.Axes` instance *ax*.
@@ -1141,12 +1124,6 @@ class TextBox(AxesWidget):
         The color of the text box when hovering.
     """
 
-    cnt = _api.deprecated("3.4")(property(  # Not real, but close enough.
-        lambda self: sum(len(d) for d in self._observers.callbacks.values())))
-    change_observers = _api.deprecated("3.4")(property(
-        lambda self: self._observers.callbacks['change']))
-    submit_observers = _api.deprecated("3.4")(property(
-        lambda self: self._observers.callbacks['submit']))
     DIST_FROM_LEFT = _api.deprecate_privatize_attribute("3.5")
 
     def __init__(self, ax, label, initial='',
@@ -1477,11 +1454,6 @@ def __init__(self, ax, labels, active=0, activecolor='blue'):
 
         self._observers = cbook.CallbackRegistry(signals=["clicked"])
 
-    cnt = _api.deprecated("3.4")(property(  # Not real, but close enough.
-        lambda self: len(self._observers.callbacks['clicked'])))
-    observers = _api.deprecated("3.4")(property(
-        lambda self: self._observers.callbacks['clicked']))
-
     def _clicked(self, event):
         if self.ignore(event) or event.button != 1 or event.inaxes != self.ax:
             return