def removeFront(self):
    if (self.size() == 0):
        return None
    else:
        value = deepcopy(self.data[0])
        del self.data[0]
        return value
def removeFront(self):
    if (self.size() == 0):
        return None
    else:
        value = deepcopy(self.data[0])
        del self.data[0]
        return value