owm.py: import sys

used in sys.exit() in an error case

diff --git a/owm.py b/owm.py
index 878e3eb..f8d6ccb 100755 (executable)
--- a/owm.py
+++ b/owm.py
@@ -14,6 +14,7 @@ import os
 import csv
 import datetime
 import math
+import sys
 
 baseurl = 'http://api.openweathermap.org/data/2.5/weather'
 debug = False