Trying to set the labels without setting ticks through pyplot now raises AttributeError

rscmendes · rscmendes · commit d963707c7408 · 2019-12-12T23:30:25.000Z
diff --git a/lib/matplotlib/pyplot.py b/lib/matplotlib/pyplot.py
@@ -1394,14 +1394,16 @@ def xticks(ticks=None, labels=None, **kwargs):
     """
     ax = gca()
 
-    if ticks is None and labels is None:
+    if ticks is None:
         locs = ax.get_xticks()
-        labels = ax.get_xticklabels()
-    elif labels is None:
+        if labels is not None:
+            raise AttributeError("Labels can't be set without setting ticks")
+    else:
         locs = ax.set_xticks(ticks)
+
+    if labels is None:
         labels = ax.get_xticklabels()
     else:
-        locs = ax.set_xticks(ticks)
         labels = ax.set_xticklabels(labels, **kwargs)
     for l in labels:
         l.update(kwargs)
@@ -1451,14 +1453,16 @@ def yticks(ticks=None, labels=None, **kwargs):
     """
     ax = gca()
 
-    if ticks is None and labels is None:
+    if ticks is None:
         locs = ax.get_yticks()
-        labels = ax.get_yticklabels()
-    elif labels is None:
+        if labels is not None:
+            raise AttributeError("Labels can't be set without setting ticks")
+    else:
         locs = ax.set_yticks(ticks)
+
+    if labels is None:
         labels = ax.get_yticklabels()
     else:
-        locs = ax.set_yticks(ticks)
         labels = ax.set_yticklabels(labels, **kwargs)
     for l in labels:
         l.update(kwargs)
