Untitled

import rospy
import math
from geometry_msgs.msg import Twist
from turtlesim.msg import Pose

def move():
    rospy.init_node('square')
    pub = rospy.Publisher('/turtle1/cmd_vel', Twist)
    rospy.sleep(1)

    twist = Twist()
    side_length = 2.0

    while not rospy.is_shutdown():
        twist.linear.x=1.0
        twist.angular.z=0.0
        for _ in range(int(side_length * 10)):
            pub.publish(twist)
            rospy.sleep(0.1)

        twist.linear.x=0.0
        twist.angular.z=(math.pi / 2.0)

        for _ in range(10):
            pub.publish(twist)
            rospy.sleep(0.1)

if __name__ == '__main__':
        move()