'TypeError：需要整数参数，得到浮点数'

Question

我正在用 python 做一个游戏，但我有一个错误

需要整数参数，得到浮点数

，我不明白为什么。给我错误的行是：

pygame.draw.circle(screen, (128, 128, 128), 
    (self.location[0]-1, self.location[1]-1), self.size+1)

class Player(object):
    def __init__(self, name, colour):
        self.name = name
        self.colour = colour
        self.level = 1
        self.feed = 0
        self.size = 2
        self.speed = 6
        self.location = (SCREEN_SIZE[0]/2, SCREEN_SIZE[1]/2)
        self.destination = self.location
        self.stopDis = 5    #Stopping distance

    def render(self, screen):
        pygame.draw.circle(screen, (128, 128, 128),
            (self.location[0]-1, self.location[1]-1), self.size+1)  #Error here
        pygame.draw.circle(screen, self.colour, self.location, self.size)   #Draw circle

Answer 1

pygame.draw.circle 的第三个参数必须是整数坐标（元组(x, y)），但除法的结果（/）是浮点值。

使用int 或round 将self.location 从浮点值转换为整数值：

pygame.draw.circle(screen, (128, 128, 128), 
    (int(self.location[0]-1), int(self.location[1]-1)), self.size+1)

或者在计算self.location时进行整数除法（//）而不是浮点除法（/）：

self.location = (SCREEN_SIZE[0] // 2, SCREEN_SIZE[1] // 2)

另见Numeric Types。