[Python] Python webbrowser wrapper websocket?

I am developing a browser NFC solution for my raspberry pi. What I develop a Java applet in a Chrome browser. The Java applet is working with my NFC reader. Every time a tag my card he will call a JavaScript function and send my Card ID to this JavaScript function. There is an alert with my card ID.

Java is really heavy and cost a lot of memory. What I do like is use Python instead of Java. The Python script needs to de the same as the Java applet.

1. 
   Read my NFC card
   
   
2. 
   Send the Card id to a JavaScript function
   
   
3. 
   Give an alert with my tag ID.
   
   
4. 
   Wait for the next card and do the same... Go to 1
   

What I discover was a Python websocket It will put up a webserver easy. Put the problem I face is that the Python script cannot call directly a JavaScript function. The JavaScript function can call a Python function but not the way around.

My question will be. Where can I find the solution to call every time the JavaScript function when I tag my NFC card with a Python script

NFC Python is http://pyscard.sourceforge.net/



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