我需要一段python控制小车的代码

以下是一段简单的Python代码，可以控制小车的移动：

import RPi.GPIO as GPIO
import time

GPIO.setmode(GPIO.BOARD)

# 定义引脚
left_forward_pin = 11
left_backward_pin = 12
right_forward_pin = 13
right_backward_pin = 15

# 设置引脚为输出模式
GPIO.setup(left_forward_pin, GPIO.OUT)
GPIO.setup(left_backward_pin, GPIO.OUT)
GPIO.setup(right_forward_pin, GPIO.OUT)
GPIO.setup(right_backward_pin, GPIO.OUT)

# 定义小车的动作函数
def forward():
    GPIO.output(left_forward_pin, GPIO.HIGH)
    GPIO.output(left_backward_pin, GPIO.LOW)
    GPIO.output(right_forward_pin, GPIO.HIGH)
    GPIO.output(right_backward_pin, GPIO.LOW)

def backward():
    GPIO.output(left_forward_pin, GPIO.LOW)
    GPIO.output(left_backward_pin, GPIO.HIGH)
    GPIO.output(right_forward_pin, GPIO.LOW)
    GPIO.output(right_backward_pin, GPIO.HIGH)

def turn_left():
    GPIO.output(left_forward_pin, GPIO.LOW)
    GPIO.output(left_backward_pin, GPIO.HIGH)
    GPIO.output(right_forward_pin, GPIO.HIGH)
    GPIO.output(right_backward_pin, GPIO.LOW)

def turn_right():
    GPIO.output(left_forward_pin, GPIO.HIGH)
    GPIO.output(left_backward_pin, GPIO.LOW)
    GPIO.output(right_forward_pin, GPIO.LOW)
    GPIO.output(right_backward_pin, GPIO.HIGH)

def stop():
    GPIO.output(left_forward_pin, GPIO.LOW)
    GPIO.output(left_backward_pin, GPIO.LOW)
    GPIO.output(right_forward_pin, GPIO.LOW)
    GPIO.output(right_backward_pin, GPIO.LOW)

# 控制小车的运动
forward()
time.sleep(2)

backward()
time.sleep(2)

turn_left()
time.sleep(1)

turn_right()
time.sleep(1)

stop()
GPIO.cleanup()

这段代码使用了RPi.GPIO库来控制树莓派上的GPIO引脚，通过设置引脚为输出模式，可以使小车的电机旋转，从而实现运动。具体来说，小车的前进、后退、左转、右转和停止动作都定义为函数，并通过控制GPIO引脚的高低电平来实现。在控制小车运动时，可以通过调用这些函数来控制小车的运动。最后，使用GPIO.cleanup()函数来清除引脚状态。