用python写七段数码管当前的时间

这是一个需要使用Python的时间模块和GPIO库来控制七段数码管的程序示例：

import time
import RPi.GPIO as GPIO

# GPIO 引脚定义
segment_pins = (26, 19, 13, 6, 5, 11, 9)
digit_pins = (17, 27, 22, 10)

# 数码管数字编码
digits = {
    0: (1, 1, 1, 1, 1, 1, 0),
    1: (0, 1, 1, 0, 0, 0, 0),
    2: (1, 1, 0, 1, 1, 0, 1),
    3: (1, 1, 1, 1, 0, 0, 1),
    4: (0, 1, 1, 0, 0, 1, 1),
    5: (1, 0, 1, 1, 0, 1, 1),
    6: (1, 0, 1, 1, 1, 1, 1),
    7: (1, 1, 1, 0, 0, 0, 0),
    8: (1, 1, 1, 1, 1, 1, 1),
    9: (1, 1, 1, 1, 0, 1, 1),
    ' ': (0, 0, 0, 0, 0, 0, 0)
}

# 初始化 GPIO 引脚
def setup():
    GPIO.setmode(GPIO.BCM)
    GPIO.setup(segment_pins, GPIO.OUT)
    GPIO.setup(digit_pins, GPIO.OUT)

# 显示数字
def show_number(number):
    for i in range(len(digit_pins)):
        GPIO.output(digit_pins[i], GPIO.LOW)
        segments = digits[number % 10] if number > 0 else digits[' ']
        for j in range(len(segment_pins)):
            GPIO.output(segment_pins[j], segments[j])
        GPIO.output(digit_pins[i], GPIO.HIGH)
        number //= 10

# 主程序
def main():
    setup()
    while True:
        current_time = time.strftime("%H%M%S", time.localtime())
        show_number(int(current_time))
        time.sleep(1)

if __name__ == '__main__':
    try:
        main()
    except KeyboardInterrupt:
        GPIO.cleanup()

这个程序将当前时间转换为字符串，然后将其转换为整数并显示在七段数码管上。程序每秒钟刷新一次，以更新时间。