Log Generation in CSV

print-log.py

#! /usr/bin/env python
import rospy
from nav_msgs.msg import Odometry, OccupancyGrid, Path, GridCells
from move_base_msgs.msg import MoveBaseActionGoal
from rosgraph_msgs.msg import Clock
from geometry_msgs.msg import Twist
    
def cmd_vel_callback(msg):
    linear_velocity_x = msg.linear.x
    linear_velocity_y = msg.linear.y
    linear_velocity_z = msg.linear.z

    angular_velocity_x = msg.angular.x
    angular_velocity_y = msg.angular.y
    angular_velocity_z = msg.angular.z

    linear_velocity_list = []
    linear_velocity_list.append(linear_velocity_x)
    linear_velocity_list.append(linear_velocity_y)
    linear_velocity_list.append(linear_velocity_z)


    angular_velocity_list = []
    angular_velocity_list.append(angular_velocity_x)
    angular_velocity_list.append(angular_velocity_y)
    angular_velocity_list.append(angular_velocity_z)

    return linear_velocity_list, angular_velocity_list


def odom_callback(msg):
    odom_x = msg.pose.pose.position.x
    odom_y = msg.pose.pose.position.y

    odometry_list = []
    odometry_list.append(odom_x)
    odometry_list.append(odom_y)

    return odometry_list

def global_costmap_callback(msg):
    global_position_x = msg.info.origin.position.x
    global_position_y = msg.info.origin.position.y
    global_orientation_y = msg.info.origin.position.y
    global_orientation_x = msg.info.origin.position.x

    global_costmap_list = []
    global_costmap_list.append(global_position_x)
    global_costmap_list.append(global_position_y)
    global_costmap_list.append(global_orientation_x)
    global_costmap_list.append(global_orientation_y)
    
    return global_costmap_list

def goal_callback(msg):
    goal = msg.goal

    return goal

def global_plan_callback(msg):
    global_path = msg.poses

    return global_path

def clock_callback(msg):
    clock_time = msg.clock
    return clock_time

def main():
    rospy.init_node('log_generation_csv')
    rospy.Subscriber('/odom', Odometry, odom_callback)
    rospy.Subscriber('/move_base/global_costmap/costmap', OccupancyGrid, global_costmap_callback)
    rospy.Subscriber('/move_base/goal', MoveBaseActionGoal, goal_callback)
    rospy.Subscriber('/move_base/DWAPlannerROS/global_plan', Path, global_plan_callback)
    rospy.Subscriber('/clock', Clock, clock_callback)
    rospy.Subscriber('/cmd_vel', Twist, cmd_vel_callback)

    '''
    How should I subscribe to many topics in the same line?
    I wish to print all of those values in a .csv file, and I am not able to.
    '''


    rospy.spin()

if __name__ == '__main__':
    main()

The variables you create inside the callback only exist until the last line of the callback (locally scoped variable). You should wrap everything in a python class, and have the logger as a member variable that each of the callbacks can call on. But the quick and dirty solution is just to declare the list as a global variable. Example

# imports
# imports

linear_velocity_list = []
angular_velocity_list = []

def cmd_vel_callback(msg):
    global   linear_velocity_list.append(msg.linear.x)
    #etc

    global   angular_velocity_list.append(msg.angular.x)
    # etc

    #end cmd_vel_callback

I'm on mobile so probably type it out instead of copy and paste
See https://stackoverflow.com/a/423596 for explanation of assigning to a global.

Thank you so much! I will try it right now.