MNT: use ordereddict to order args in setp

Make one call to `update` with the ordered dict rather than one call per element.
matplotlib · mdboom · Dec 14, 2015 · Dec 1, 2015 · Dec 1, 2015 · Dec 1, 2015
commit 0ea5fff31083924d9992161a30476e6fbd10e928
diff --git a/lib/matplotlib/artist.py b/lib/matplotlib/artist.py
@@ -2,6 +2,7 @@
                        unicode_literals)

 from matplotlib.externals import six
+from collections import OrderedDict

 import re
 import warnings
@@ -1451,17 +1452,16 @@ def setp(obj, *args, **kwargs):
    if not cbook.iterable(obj):
        objs = [obj]
    else:
-        objs = cbook.flatten(obj)
+        objs = list(cbook.flatten(obj))

    if len(args) % 2:
        raise ValueError('The set args must be string, value pairs')

-    funcvals = []
+    # put args into ordereddict to maintain order
+    funcvals = OrderedDict()
    for i in range(0, len(args) - 1, 2):
-        funcvals.append((args[i], args[i + 1]))
-    # do the *args one at a time to ensure order
-    ret = [o.update({s: val}) for s, val in funcvals for o in objs]
-    # apply kwargs in bulk
+        funcvals[args[i]] = args[i + 1]
+    ret = [o.update(funcvals) for o in objs]
    ret.extend([o.update(kwargs) for o in objs])
    return [x for x in cbook.flatten(ret)]