对如下定义的循环单链表，横线处填写（ ）。
class Node:
def __init__(self, data):
self.data = data
self.next = None
def create_list(value):
head = Node(value)
head.next = head
return head
def insert_tail(head, value):
p = head
while p.next != head:
p = p.next
node = Node(value)
node.next = head
p.next = node
def print_list(head):
_______________________________
while True:
print(p.data, end=" ")
p = p.next
if p == head:
break
print()
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