support str for timeout and ttl (#454)

Author: argaen

aiocache/base.py

@@ -106,9 +106,9 @@ class BaseCache:
     def __init__(
         self, serializer=None, plugins=None, namespace=None, key_builder=None, timeout=5, ttl=None
     ):
-        self.timeout = timeout
+        self.timeout = float(timeout) if timeout is not None else timeout
         self.namespace = namespace
-        self.ttl = ttl
+        self.ttl = float(ttl) if ttl is not None else ttl
         self.build_key = key_builder or self._build_key
 
         self._serializer = None

tests/ut/test_base.py

@@ -144,6 +144,14 @@ async def dummy(self, *args, **kwargs):
 
 
 class TestBaseCache:
+    def test_str_ttl(self):
+        cache = BaseCache(ttl="1.5")
+        assert cache.ttl == 1.5
+
+    def test_str_timeout(self):
+        cache = BaseCache(timeout="1.5")
+        assert cache.timeout == 1.5
+
     @pytest.mark.asyncio
     async def test_add(self, base_cache):
         with pytest.raises(NotImplementedError):