BUG : don't assume label in boxpplot_stat

lib/matplotlib/cbook.py

@@ -10,7 +10,8 @@
                         unicode_literals)
 
 import six
-from six.moves import xrange
+from six.moves import xrange, zip
+from itertools import repeat
 
 import datetime
 import errno
@@ -1948,14 +1949,15 @@ def _compute_conf_interval(data, med, iqr, bootstrap):
 
     ncols = len(X)
     if labels is None:
-        labels = [str(i) for i in range(1, ncols+1)]
+        labels = repeat(None)
     elif len(labels) != ncols:
         raise ValueError("Dimensions of labels and X must be compatible")
 
     for ii, (x, label) in enumerate(zip(X, labels), start=0):
         # empty dict
         stats = {}
-        stats['label'] = label
+        if label is not None:
+            stats['label'] = label
 
         # arithmetic mean
         stats['mean'] = np.mean(x)

lib/matplotlib/tests/test_cbook.py

@@ -121,8 +121,7 @@ def setup(self):
             'q1': 1.3597529879465153,
             'q3': 14.85246294739361,
             'whishi': 27.899688243699629,
-            'whislo': 0.042143774965502923,
-            'label': 1
+            'whislo': 0.042143774965502923
         }
 
         self.known_bootstrapped_ci = {
@@ -136,10 +135,6 @@ def setup(self):
             'fliers': np.array([92.55467075, 87.03819018]),
         }
 
-        self.known_res_with_labels = {
-            'label': 'Test1'
-        }
-
         self.known_res_percentiles = {
             'whislo':   0.1933685896907924,
             'whishi':  42.232049135969874
@@ -229,11 +224,15 @@ def test_results_whiskers_percentiles(self):
             )
 
     def test_results_withlabels(self):
-        labels = ['Test1', 2, 3, 4]
+        labels = ['Test1', 2, 'ardvark', 4]
         results = cbook.boxplot_stats(self.data, labels=labels)
         res = results[0]
-        for key in list(self.known_res_with_labels.keys()):
-            assert_equal(res[key], self.known_res_with_labels[key])
+        for lab, res in zip(labels, results):
+            assert_equal(res['label'], lab)
+
+        results = cbook.boxplot_stats(self.data)
+        for res in results:
+            assert('label' not in res)
 
     @raises(ValueError)
     def test_label_error(self):