add: add repr method

lru_cache.py

@@ -4,6 +4,9 @@ class LRUCache:
         self.capacity = capacity
         self.slots = []
 
+    def __repr__(self):
+        return ", ".join(map(lambda x: str(x), self.slots))
+
     def get(self, key: int) -> int:
         if key <= len(self.slots) -1:
             return self.slots[key]
@@ -21,7 +24,10 @@ def main():
     print(cache.get(0))
 
     cache.put(0,1)
-    print(cache.get(0))
+    print(cache)
+
+    cache.put(1,2)
+    print(cache)
 
 if __name__ == "__main__":
     main()