GitHub Action formats our code with psf/black (#1569)

* GitHub Action formats our code with psf/black

@poyea Your review please.

* fixup! Format Python code with psf/black push

other/least_recently_used.py

@@ -2,12 +2,13 @@ from abc import abstractmethod
 import sys
 from collections import deque
 
+
 class LRUCache:
     """ Page Replacement Algorithm, Least Recently Used (LRU) Caching."""
 
-    dq_store = object() # Cache store of keys
-    key_reference_map = object() # References of the keys in cache
-    _MAX_CAPACITY: int = 10 # Maximum capacity of cache
+    dq_store = object()  # Cache store of keys
+    key_reference_map = object()  # References of the keys in cache
+    _MAX_CAPACITY: int = 10  # Maximum capacity of cache
 
     @abstractmethod
     def __init__(self, n: int):
@@ -19,7 +20,7 @@ class LRUCache:
         if not n:
             LRUCache._MAX_CAPACITY = sys.maxsize
         elif n < 0:
-            raise ValueError('n should be an integer greater than 0.')
+            raise ValueError("n should be an integer greater than 0.")
         else:
             LRUCache._MAX_CAPACITY = n
 
@@ -51,6 +52,7 @@ class LRUCache:
         for k in self.dq_store:
             print(k)
 
+
 if __name__ == "__main__":
     lru_cache = LRUCache(4)
     lru_cache.refer(1)