1 files changed, 28 insertions, 0 deletions
diff --git a/challenge-284/sgreen/python/ch-2.py b/challenge-284/sgreen/python/ch-2.py
new file mode 100755
index 0000000000..a236c11600
--- /dev/null
+++ b/challenge-284/sgreen/python/ch-2.py
@@ -0,0 +1,28 @@
+#!/usr/bin/env python3
+
+import json
+import sys
+
+
+def find_index(lst: list, val: int):
+    # Find the position of val in lst. If it does not appear, return the
+    #  length of the list
+    return lst.index(val) if val in lst else len(lst)
+
+
+def relative_sort(list1: list, list2: list) -> list:
+    # Sort the first list, in the order they appear in the second list. If
+    # it doesn't appear in the second list, append to the end in numerical order.
+    return sorted(list1, key=lambda i: (find_index(list2, i), i))
+
+
+def main():
+    lists = json.loads(sys.argv[1])
+    result = relative_sort(*lists)
+
+    # Convert to a tuple to match expected output
+    print(tuple(result))
+
+
+if __name__ == '__main__':
+    main()