use a tuple ase the cache key instead of string concatenation

As suggested by cbay, the cache key can be a tuple instead of a string
concatenation.

1 files changed, 1 insertions, 1 deletions

diff --git a/misc/log-analytics/import_logs.py b/misc/log-analytics/import_logs.py
index d43b5e56be..59ba002591 100755
--- a/misc/log-analytics/import_logs.py
+++ b/misc/log-analytics/import_logs.py
@@ -1687,7 +1687,7 @@ class Parser(object):
                     timezone_key = format.get('timezone')
                 except BaseFormatException:
                     timezone_key = ''
-                date_key = format.get('date') + '|' + timezone_key
+                date_key = (format.get('date'), timezone_key)
                 hit.date = cache_dates.get(date_key)
             if not hit.date:
                 date_string = format.get('date')