Implementation of a simple Queue

Queue.py

## Implement Queue in Python

class Queue():
    def __init__(self):
        self.arr = []

    def push(self, item):
        self.arr.insert(0, item)

    def pop(self):
        if self.arr:
            self.arr.pop()
        else:
            return 'Queue is Empty'

    def poll(self):
        if self.arr:
            return self.arr[-1]
        else:
            return 'Queue is Empty'

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

    def __str__(self):
        return str(self.arr)


q = Queue()
print(q)
q.push(5)
q.push(6)
q.push(10)
print(q)
q.pop()
print(q)