Python中roslibpy 获取小车坐标并打印出来

可以使用如下代码：

import rospy
from roslibpy import Topic

# create a ROS node
rospy.init_node('get_car_position')

# create a topic for subscribing the car's position
car_position_topic = Topic(rospy, '/car_position', 'geometry_msgs/PointStamped')

# define a callback function to print the car's position
def print_car_position(message):
    x = message['point']['x']
    y = message['point']['y']
    z = message['point']['z']
    print('Car position: x={}, y={}, z={}'.format(x, y, z))

# subscribe to the car's position topic
car_position_topic.subscribe(print_car_position)

# spin the ROS node to keep it alive
rospy.spin()

此代码使用roslibpy库中的Topic类来订阅小车位置主题。订阅后，每当有位置信息时，将调用print_car_position函数打印出位置信息。