streamlit ros python

streamlit_ros_python.py

from streamlit.web import cli as stcli
import streamlit as st
import rospy
from std_msgs.msg import String, Int32
import sys
import time

mynum=0
mydelta=0

def callback(data):
    global mydelta, mynum
    mydelta=mynum-data.data
    mynum=data.data
    #rospy.loginfo(rospy.get_caller_id() + "I heard %s", data.data)

def getData():
    return mynum, mydelta

rospy.init_node('my_streamlit_ros_node')
pub = rospy.Publisher('/mystring', String, queue_size=10)
rospy.Subscriber("mynumber", Int32 , callback)


def main():
    st.title('Streamlit APP:')
    st.subheader('Commuicating with ROS')
    mytext = st.text_input('Send String to ROS', 'Life of Brian')
    pub.publish(mytext)
    metrics = st.empty()
    while True:
        mynum, mydelta=getData()
        with metrics:
            st.metric(label="Get Int32 Number from ROS", value=mynum, delta=mydelta, delta_color="inverse")
        time.sleep(1)

if __name__ == '__main__':
    if st._is_running_with_streamlit:
        main()
    else:
        sys.argv = ["streamlit", "run", sys.argv[0]]
        sys.exit(stcli.main())