matplotlib
diff --git a/‎doc/api/next_api_changes/2018-09-18-AL-removals.rst‎
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diff --git a/‎lib/matplotlib/axes/_base.py‎
Lines changed: 1 addition & 5 deletions b/‎lib/matplotlib/axes/_base.py‎
Lines changed: 1 addition & 5 deletions
diff --git a/‎lib/matplotlib/axis.py‎
Lines changed: 8 additions & 10 deletions b/‎lib/matplotlib/axis.py‎
Lines changed: 8 additions & 10 deletions
diff --git a/‎lib/matplotlib/cbook/__init__.py‎
Lines changed: 0 additions & 15 deletions b/‎lib/matplotlib/cbook/__init__.py‎
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diff --git a/‎lib/matplotlib/pyplot.py‎
Lines changed: 1 addition & 3 deletions b/‎lib/matplotlib/pyplot.py‎
Lines changed: 1 addition & 3 deletions
diff --git a/‎lib/mpl_toolkits/mplot3d/axes3d.py‎
Lines changed: 1 addition & 1 deletion b/‎lib/mpl_toolkits/mplot3d/axes3d.py‎
Lines changed: 1 addition & 1 deletion
@@ -19,3 +19,4 @@ The following deprecated APIs were removed:
   ``GridSpecFromSubplotSpec.get_subplot_params``,
 - svgfont support (in :rc:`svg.fonttype`),
 - passing 'box-forced' to `axes.Axes.set_adjustable`,
+- support for the strings 'on'/'true'/'off'/'false' to mean True/False.
@@ -12,8 +12,7 @@
 import matplotlib
 
 from matplotlib import cbook, rcParams
-from matplotlib.cbook import (
-    _OrderedSet, _check_1d, _string_to_bool, index_of, get_label)
+from matplotlib.cbook import _OrderedSet, _check_1d, index_of, get_label
 from matplotlib import docstring
 import matplotlib.colors as mcolors
 import matplotlib.lines as mlines
@@ -2720,9 +2719,6 @@ def grid(self, b=None, which='major', axis='both', **kwargs):
         """
         if len(kwargs):
             b = True
-        elif b is not None:
-            b = _string_to_bool(b)
-
         if axis not in ['x', 'y', 'both']:
             raise ValueError("The argument 'axis' must be one of 'x', 'y' or "
                              "'both'.")
 
@@ -11,7 +11,6 @@
 from matplotlib import rcParams
 import matplotlib.artist as artist
 import matplotlib.cbook as cbook
-from matplotlib.cbook import _string_to_bool
 import matplotlib.font_manager as font_manager
 import matplotlib.lines as mlines
 import matplotlib.patches as mpatches
@@ -878,22 +877,21 @@ def _translate_tick_kw(kw, to_init_kw=True):
             if 'rotation' in kw:
                 kwtrans['labelrotation'] = kw.pop('rotation')
             if 'left' in kw:
-                kwtrans['tick1On'] = _string_to_bool(kw.pop('left'))
+                kwtrans['tick1On'] = kw.pop('left')
             if 'bottom' in kw:
-                kwtrans['tick1On'] = _string_to_bool(kw.pop('bottom'))
+                kwtrans['tick1On'] = kw.pop('bottom')
             if 'right' in kw:
-                kwtrans['tick2On'] = _string_to_bool(kw.pop('right'))
+                kwtrans['tick2On'] = kw.pop('right')
             if 'top' in kw:
-                kwtrans['tick2On'] = _string_to_bool(kw.pop('top'))
-
+                kwtrans['tick2On'] = kw.pop('top')
             if 'labelleft' in kw:
-                kwtrans['label1On'] = _string_to_bool(kw.pop('labelleft'))
+                kwtrans['label1On'] = kw.pop('labelleft')
             if 'labelbottom' in kw:
-                kwtrans['label1On'] = _string_to_bool(kw.pop('labelbottom'))
+                kwtrans['label1On'] = kw.pop('labelbottom')
             if 'labelright' in kw:
-                kwtrans['label2On'] = _string_to_bool(kw.pop('labelright'))
+                kwtrans['label2On'] = kw.pop('labelright')
             if 'labeltop' in kw:
-                kwtrans['label2On'] = _string_to_bool(kw.pop('labeltop'))
+                kwtrans['label2On'] = kw.pop('labeltop')
             if 'colors' in kw:
                 c = kw.pop('colors')
                 kwtrans['color'] = c
 
@@ -416,21 +416,6 @@ def is_scalar_or_string(val):
     return isinstance(val, str) or not np.iterable(val)
 
 
-def _string_to_bool(s):
-    """Parses the string argument as a boolean"""
-    if not isinstance(s, str):
-        return bool(s)
-    warn_deprecated("2.2", "Passing one of 'on', 'true', 'off', 'false' as a "
-                    "boolean is deprecated; use an actual boolean "
-                    "(True/False) instead.")
-    if s.lower() in ['on', 'true']:
-        return True
-    if s.lower() in ['off', 'false']:
-        return False
-    raise ValueError('String "%s" must be one of: '
-                     '"on", "off", "true", or "false"' % s)
-
-
 def get_sample_data(fname, asfileobj=True):
     """
     Return a sample data file.  *fname* is a path relative to the
 
@@ -33,8 +33,7 @@
 import matplotlib.image
 from matplotlib import rcsetup, style
 from matplotlib import _pylab_helpers, interactive
-from matplotlib.cbook import (
-    dedent, deprecated, silent_list, warn_deprecated, _string_to_bool)
+from matplotlib.cbook import dedent, deprecated, silent_list, warn_deprecated
 from matplotlib import docstring
 from matplotlib.backend_bases import FigureCanvasBase
 from matplotlib.figure import Figure, figaspect
@@ -1358,7 +1357,6 @@ def box(on=None):
     ax = gca()
     if on is None:
         on = not ax.get_frame_on()
-    on = _string_to_bool(on)
     ax.set_frame_on(on)
 
 ## Axis ##
 
@@ -1300,7 +1300,7 @@ def grid(self, b=True, **kwargs):
         # TODO: Operate on each axes separately
         if len(kwargs):
             b = True
-        self._draw_grid = cbook._string_to_bool(b)
+        self._draw_grid = b
         self.stale = True
 
     def ticklabel_format(