为什么我的python模拟时钟的指针显示错误的时间？

Question

我正在用 pygame、datetime 和 math 制作一个模拟时钟程序，但是指针所在的角度都关闭了，秒针走得太快了。这是代码：

import pygame

from datetime import datetime

from datetime import time

from datetime import timedelta

import math

import time

pygame.init()

white = (255, 255, 255)

black = (0, 0, 0)

display_width = 400

display_height = 400

gameDisplay = pygame.display.set_mode((display_width, display_height))

pygame.display.set_caption('Clock')

gameDisplay.fill(white)

clock = pygame.time.Clock()

clock_radius = 200

clock_center = int(display_width / 2), int(display_height / 2)

def main():

    for event in pygame.event.get():

        if event.type == pygame.QUIT:

            quit()

    # Drawing the clock and its center.

    pygame.draw.circle(gameDisplay, black, clock_center, clock_radius, 5)

    pygame.draw.circle(gameDisplay, black, clock_center, 5, 0)

    pygame.display.update()

    # I move the hands by drawing a white line over the previous line

    # and then drawing the new line (which is a hand), so I need a

    # variable equal to the time one second ago (for the white line) as

    # well as the current time (for the current hand).

    now_hour = int(datetime.now().strftime('%I'))

    now_minute = int(datetime.now().strftime('%M'))

    now_second = int(datetime.now(). strftime('%S'))

    one_sec_ago_hour = int((datetime.now() - timedelta(seconds=1)).strftime('%I'))

    one_sec_ago_minute = int((datetime.now() - timedelta(seconds=1)).strftime('%M'))

    one_sec_ago_second = int((datetime.now() - timedelta(seconds=1)).strftime('%S'))