allowed changing the (max)length of a Cache

cacher.py

@@ -33,8 +33,8 @@ class Cache:
 
     def __init__(self, size=100):
         self.size = size
-        self.times = deque(maxlen=size)
-        self.values  = deque(maxlen=size)
+        self.times  = deque(maxlen=size)
+        self.values = deque(maxlen=size)
 
     def callback_append(self, value=None, **kwargs):
         self.append(value)
@@ -58,6 +58,11 @@ class Cache:
         n = len(self.times)
         return f"Cache: {n} / {self.size}"
 
+    def set_size(self, size):
+        self.size = size
+        self.times  = deque(self.times,  maxlen=size)
+        self.values = deque(self.values, maxlen=size)
+
 
 
 # need to create object here to share it between sessions