# Launch python file in Roslaunch command

Hi!

I need some help running a python script from a roslaunch command. I have a RPlidar connected to my raspberry pi which is ROS configured. I have a special software part of RViz called Hector Slam installed. Also connected to the raspberry pi is an actuator running a simple program.

When I type roslaunch hector_slam_launch tutorial.launch , I want a python file to activate which starts the actuator.

Simple Actuator Code:

from gpiozero import AngularServo
from time import sleep

servo = AngularServo(18, min_pulse_width=0.0006, max_pulse_width=0.0023)

while (True):
servo.angle = 90
sleep(2)
servo.angle = 0
sleep(2)
servo.angle = -90
sleep(2)

Now I have called this file servotest.py. I have placed it in the directory hector_slam_launch as well and I have used the command in terminal that makes it an executable (chmod +x servotest.py). In the terminal though if I do ./servotest it comes up with this error in terminal:

./servotest.py: line 3: $'\r': command not found ./servotest.py: line 4: syntax error near unexpected token (' ./servotest.py: line 4: servo = AngularServo(18, min_pulse_width=0.0006, max_pu'se_width=0.0023) This python file works perfectly when launching Thonny (python IDE) and clicking run. I have also added in the tutorial.launch file lines 8 and 9 (the two lines beginning with <node> and </node>): <?xml version="1.0"?> <launch> <arg name="geotiff_map_file_path" default="$(find hector_geotiff)/maps"/>

<param name="/use_sim_time" value="false"/>
args="-d $(find hector_slam_launch)/rviz_cfg/mapping_demo.rviz"/> <include file="$(find hector_mapping)/launch/mapping_default.launch"/>
<include file="$(find hector_geotiff_launch)/launch/geotiff_mapper.launch"> <arg name="trajectory_source_frame_name" value="scanmatcher_frame"/> <arg name="map_file_path" value="$(arg geotiff_map_file_path)"/>