Ignore KeyError in LRUCache when moving key to end when default value…

… used.

Fixes #4

CHANGELOG.rst

@@ -2,6 +2,9 @@ Changelog
 =========
 
 
+- Fix bug in ``LRUCache.get()`` where supplying a ``default`` value would result in a ``KeyError``.
+
+
 v0.10.1 (2018-07-15)
 --------------------
 

src/cacheout/lru.py

@@ -13,5 +13,12 @@ class LRUCache(Cache):
     """
     def _get(self, key, default=None):
         value = super()._get(key, default=default)
-        self._cache.move_to_end(key)
+
+        try:
+            self._cache.move_to_end(key)
+        except KeyError:
+            # KeyError occurs when cache key doesn't exist which happens when
+            # default value is used.
+            pass
+
         return value

tests/test_lru.py

@@ -76,3 +76,9 @@ def test_lru_get(cache):
     """Test that LRUCache.get() returns cached value."""
     for key, value in cache.items():
         assert cache.get(key) == value
+
+
+def test_lru_get_default(cache):
+    """Test that LRUCache.get() returns a default value."""
+    default = 'bar'
+    assert cache.get('foo', default=default) == default