matplotlib
diff --git a/‎lib/matplotlib/figure.py
Lines changed: 14 additions & 35 deletions b/‎lib/matplotlib/figure.py
Lines changed: 14 additions & 35 deletions
@@ -384,7 +384,6 @@ def show(self, warn=True):
         AttributeError.
 
         .. warning::
-
             This does not manage an GUI event loop. Consequently, the figure
             may only be shown briefly or not shown at all if you or your
             environment are not managing an event loop.
@@ -1265,16 +1264,13 @@ def add_subplot(self, *args, **kwargs):
 
         Parameters
         ----------
-        *args : int, (int, int, *index*), or `SubplotSpec`, default: (1, 1, 1)
+        *args, int or (int, int, int) or `SubplotSpec`, default: (1, 1, 1)
             The position of the subplot described by one of
 
             - Three integers (*nrows*, *ncols*, *index*). The subplot will
               take the *index* position on a grid with *nrows* rows and
               *ncols* columns. *index* starts at 1 in the upper left corner
-              and increases to the right. *index* can also be  a two-tuple
-              specifying the (*start*, *stop*) indices of the subplot, i.e.,
-              ``fig.add_subplot(3, 1, (1, 2))`` makes a subplot that spans the
-              upper 2/3 of the figure.
+              and increases to the right.
             - A 3-digit integer. The digits are interpreted as if given
               separately as three single-digit integers, i.e.
               ``fig.add_subplot(235)`` is the same as
@@ -1381,26 +1377,14 @@ def add_subplot(self, *args, **kwargs):
                 raise TypeError('Positional arguments are not a valid '
                                 'position specification.')
         elif nargs == 3:
-            newarg = [None] * 3
-            message = ("Passing non-integers as three-element "
-                       "position specification is deprecated since "
-                       "%(since)s and will be removed %(removal)s.")
-            for nn, arg in enumerate(args[:2]):
+            for arg in args:
                 if not isinstance(arg, Integral):
-                    cbook.warn_deprecated("3.3", message=message)
-                newarg[nn] = int(arg)
-            args2 = args[2]
-            if isinstance(args[2], tuple) and len(args[2]) == 2:
-                # start/stop two-tuple is allowed...
-                for arg in args[2]:
-                    if not isinstance(arg, Integral):
-                        cbook.warn_deprecated("3.3", message=message)
-                newarg[2] = (int(args[2][0]), int(args[2][1]))
-            else:
-                if not isinstance(args[2], Integral):
-                newarg[2] = int(args[2])
-            args = tuple(newarg)
+                    cbook.warn_deprecated(
+                        "3.3",
+                        message="Passing non-integers as three-element "
+                                "position specification is deprecated since "
+                                "%(since)s and will be removed %(removal)s.")
+            args = tuple(map(int, args))
         else:
             raise TypeError(f'add_subplot() takes 1 or 3 positional arguments '
                             f'but {nargs} were given')
@@ -1413,19 +1397,13 @@ def add_subplot(self, *args, **kwargs):
             # make a key for the subplot (which includes the axes object id
             # in the hash)
             key = self._make_key(*args, **kwargs)
-
         else:
-            if not args:
-                args = (1, 1, 1)
-            # Normalize correct ijk values to (i, j, k) here so that
-            # add_subplot(111) == add_subplot(1, 1, 1).  Invalid values will
-            # trigger errors later (via SubplotSpec._from_subplot_args).
-            if (len(args) == 1 and isinstance(args[0], Integral)
-                    and 100 <= args[0] <= 999):
-                args = tuple(map(int, str(args[0])))
             projection_class, kwargs, key = \
                 self._process_projection_requirements(*args, **kwargs)
-            ax = self._axstack.get(key)  # search axes with this key in stack
+
+            # try to find the axes with this key in the stack
+            ax = self._axstack.get(key)
+
             if ax is not None:
                 if isinstance(ax, projection_class):
                     # the axes already existed, so set it as active & return
@@ -1438,6 +1416,7 @@ def add_subplot(self, *args, **kwargs):
                     # Without this, add_subplot would be simpler and
                     # more similar to add_axes.
                     self._axstack.remove(ax)
+
             ax = subplot_class_factory(projection_class)(self, *args, **kwargs)
 
         return self._add_axes_internal(key, ax)