Merge pull request #269 from elias-a/reuse-port

Add SO_REUSEADDR option before binding to port

Author: mwcraig

CONTRIBUTORS.md

@@ -37,6 +37,7 @@ We are certain the list is incomplete; please let one of us know by opening an [
 + Alex Herrera ([@aherrera1721](https://github.com/aherrera1721))
 + Michał Górny ([@mgorny](https://github.com/mgorny))
 + Ryder Johnson ([@UZ9](https://github.com/UZ9))
++ Elias Alstead ([@elias-a](https://github.com/elias-a))
 
 ## Full timeline of vpython development
 

vpython/no_notebook.py

@@ -60,6 +60,7 @@ def signal_handler(signal, frame):
 
 def find_free_port(port):
     s = socket.socket()
+    s.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
     s.bind(('', port))
     return s.getsockname()[1]