请问这个错误怎么破，python

Question

原问题：
Implement the Queue ADT, using a list such that the rear of the queue is at the end of the list

class Queue:
def init(self):
self.items = []

def isEmpty(self):
   return self.items == []

def enqueue(self, item):
   self.items.insert(0,item)

def dequeue(self):
   return self.items.pop()

def size(self):
   return len(self.items)

q=Queue()

q.enqueue(4)
q.enqueue('dog')
q.enqueue(True)
print(q.size())
print q.dequeue()
print(q.size())

Answer 1

print (q.dequeue())加上括号