How to connect remote roscore with python in runtime

edit

Thanks I know this solution,but I want to implement it in code like roscpp, the parameters come from the UI I have tried to use os.system("shell commond") but failed,like this:

os.system('export ROS_MASTER_URI=http://192.168.0.91:11311 ; echo $ROS_MASTER_URI')
os.system('echo $ROS_MASTER_URI')

I see. You could try https://docs.python.org/2.7/library/o...

Thanks, the function of os.putenv() can't set the environment on my own running python,just like the way "launch terminal 、set environment and run command", my rusty code in link text

please try os.putenv("ROS_MASTER_URI", "http://192.168.0.91:11311") (and the same for ROS_HOSTNAME) then you can check with print(os.environ). This seems to be also how init_nodegets the params (https://docs.ros.org/melodic/api/rosp... - line 317)

Thank you serserly ,the problem is already solved.

i try to use os.putenv

os.putenv("ROS_MASTER_URI", "http://192.168.0.91:11311")
print(os.environ)
self.node =  rospy.init_node('leap_one_gazebo_control', anonymous=True)
print(os.environ)

then output:

http://localhost:11311
http://localhost:11311

so i print the type(os.environ) and Force modify data of the dictionary

os.environ['ROS_MASTER_URI'] = 'http://192.168.0.91:11311'
os.environ['ROS_MASTER_IP'] = '192.168.0.91'

tne output

http://192.168.0.91:11311
http://192.168.0.91:11311

ok, cool. Can you please accept my answer then (click the little check mark)