09_queue/circular_queue.py code of enqueue has bug

[1lily]

the enqueue part is enlarge the array and didn't change it ,when the test case large, and go into tail < head, will have bugs. so need change the enqueue function as bellow:
def enqueue(self,data):
if (self._tail+1) % self._capacity == self._head:
return False
#self._value.append(data)
self._tail = (self._tail+1) % self._capacity

    if len(self._value) < self._capacity -1:
        self._value.append(data)
    else:
        self._value[self._tail] = data

And also need change repr fuction as bellow:
def repr(self):
if self._tail >= self._head:
return " ".join(item for item in self._value[self._head:self._tail])
else:
return " ".join(item for item in chain(self._value[self._head:], self._value[:self._tail+1]))