Merge pull request #12056 from ysth/challenge-322-ysth

challenge 322 better python solution for challenge 2 by ysth

1 files changed, 10 insertions, 8 deletions

diff --git a/challenge-322/ysth/python/ch-2.py b/challenge-322/ysth/python/ch-2.py
index 75301f87a5..058872ecca 100644
--- a/challenge-322/ysth/python/ch-2.py
+++ b/challenge-322/ysth/python/ch-2.py
@@ -1,17 +1,19 @@
 import sys
+import operator
 
 integers = [int(value) for value in sys.argv[1:]]
 
+# python doesn't have a clean dict slice syntax; usually a comprehension
+# is used (e.g. (mydict[key] for key in mykeys)), but that evaluates the
+# dict expression more than once, so use itemgetter or a map
+
 print(
     " ".join(
-        list(
-            map(
-                {
-                    value: str(i + 1)
-                    for i, value in enumerate(sorted(set(integers)))
-                }.__getitem__,
-                integers,
-            )
+        operator.itemgetter(*integers)(
+            {
+                value: str(i + 1)
+                for i, value in enumerate(sorted(set(integers)))
+            }
         )
     )
 )