From f8b4bccf5b6ebc9246220438b2a1e50d0cf24c38 Mon Sep 17 00:00:00 2001
From: Antony Lee <anntzer.lee@gmail.com>
Date: Mon, 1 Apr 2019 22:20:26 +0200
Subject: [PATCH] Some more usage of _check_in_list.

---
 lib/matplotlib/axes/_axes.py | 17 ++++++-----------
 lib/matplotlib/cm.py         | 14 ++++----------
 2 files changed, 10 insertions(+), 21 deletions(-)

diff --git a/lib/matplotlib/axes/_axes.py b/lib/matplotlib/axes/_axes.py
index 4630a7568818..a2b55ac851c6 100644
--- a/lib/matplotlib/axes/_axes.py
+++ b/lib/matplotlib/axes/_axes.py
@@ -6573,17 +6573,12 @@ def hist(self, x, bins=None, range=None, density=None, weights=None,
         if bins is None:
             bins = rcParams['hist.bins']
 
-        # Validate string inputs here so we don't have to clutter
-        # subsequent code.
-        if histtype not in ['bar', 'barstacked', 'step', 'stepfilled']:
-            raise ValueError("histtype %s is not recognized" % histtype)
-
-        if align not in ['left', 'mid', 'right']:
-            raise ValueError("align kwarg %s is not recognized" % align)
-
-        if orientation not in ['horizontal', 'vertical']:
-            raise ValueError(
-                "orientation kwarg %s is not recognized" % orientation)
+        # Validate string inputs here to avoid cluttering subsequent code.
+        cbook._check_in_list(['bar', 'barstacked', 'step', 'stepfilled'],
+                             histtype=histtype)
+        cbook._check_in_list(['left', 'mid', 'right'], align=align)
+        cbook._check_in_list(['horizontal', 'vertical'],
+                             orientation=orientation)
 
         if histtype == 'barstacked' and not stacked:
             stacked = True
diff --git a/lib/matplotlib/cm.py b/lib/matplotlib/cm.py
index 26b1766e84dd..030612f724a2 100644
--- a/lib/matplotlib/cm.py
+++ b/lib/matplotlib/cm.py
@@ -167,19 +167,13 @@ def get_cmap(name=None, lut=None):
     """
     if name is None:
         name = mpl.rcParams['image.cmap']
-
     if isinstance(name, colors.Colormap):
         return name
-
-    if name in cmap_d:
-        if lut is None:
-            return cmap_d[name]
-        else:
-            return cmap_d[name]._resample(lut)
+    cbook._check_in_list(sorted(cmap_d), name=name)
+    if lut is None:
+        return cmap_d[name]
     else:
-        raise ValueError(
-            "Colormap %s is not recognized. Possible values are: %s"
-            % (name, ', '.join(sorted(cmap_d))))
+        return cmap_d[name]._resample(lut)
 
 
 class ScalarMappable(object):