Adds FixedTimezone cache

Author: sdispater

pendulum/pendulum.py

@@ -66,13 +66,13 @@ def _safe_create_datetime_zone(cls, obj):
         if isinstance(obj, (int, float)):
             timezone_offset = obj * 60 * 60
 
-            return FixedTimezone(timezone_offset)
+            return FixedTimezone.load(timezone_offset)
         elif isinstance(obj, datetime.tzinfo) and not isinstance(obj, Timezone):
             # pytz
             if hasattr(obj, 'localize'):
                 return cls._timezone(obj.zone)
 
-            return FixedTimezone(obj.utcoffset(None).total_seconds())
+            return FixedTimezone.load(obj.utcoffset(None).total_seconds())
 
         return cls._timezone(obj)
 

pendulum/tz/timezone.py

@@ -74,7 +74,7 @@ def load(cls, name):
         returns it from the cache.
 
         :param name: The name of the timezone
-        :type name: str
+        :type name: str or int
 
         :rtype: Timezone
         """
@@ -450,6 +450,8 @@ class FixedTimezone(Timezone):
     A timezone that has a fixed offset to UTC.
     """
 
+    _cache = {}
+
     def __init__(self, offset, name=None, transition_type=None):
         """
         :param offset: offset to UTC in seconds.
@@ -479,6 +481,13 @@ def __init__(self, offset, name=None, transition_type=None):
         )
         self._tzinfo = self._tzinfos[0]
 
+    @classmethod
+    def load(cls, name):
+        if name not in cls._cache:
+            cls._cache[name] = cls(name)
+
+        return cls._cache[name]
+
     def _normalize(self, dt, dst_rule=Timezone.POST_TRANSITION):
         return dt.replace(tzinfo=self._tzinfo)