Add python code of chapter queue to docs.

codes/python/include/__init__.py

@@ -1,5 +1,6 @@
 import copy
 import math
+import queue
 import random
 import functools
 import collections

codes/python/include/print_util.py

@@ -4,6 +4,8 @@ Created Time: 2021-12-11
 Author: Krahets (krahets@163.com)
 '''
 
+import copy
+import queue
 from .binary_tree import TreeNode, tree_to_list
 from .linked_list import ListNode, linked_list_to_list
 
@@ -28,7 +30,6 @@ def print_linked_list(head):
     arr = linked_list_to_list(head)
     print(' -> '.join([str(a) for a in arr]))
 
-
 class Trunk:
     def __init__(self, prev=None, str=None):
         self.prev = prev