clear_contest: make python3 ready, remove unused import

clear_contest.py

@@ -1,8 +1,6 @@
 #!/usr/bin/env python
 from __future__ import print_function
 
-import datetime
-
 # prepare environment
 import sys
 sys.path.append("..")
@@ -11,11 +9,15 @@ os.environ.setdefault("DJANGO_SETTINGS_MODULE", "cqtu.settings")
 import django
 django.setup()
 
-confirm = raw_input("Do are you sure you want to clear all contest data? Answer with uppercase YES: ")
+confirm_msg = "Do are you sure you want to clear all contest data? Answer with uppercase YES: "
+try:
+    confirm = raw_input(confirm_msg)
+except NameError:
+    confirm = input(confirm_msg)
 
 if confirm != "YES":
-	print("Aborting")
-	sys.exit(1)
+    print("Aborting")
+    sys.exit(1)
 
 
 from contest.models import QSO, ShadowCall, Reference, User