pass the full environment rather than just PYTHONPATH

Author: rdeits

src/meshcat/servers/zmqserver.py

@@ -56,11 +56,9 @@ def start_zmq_server_as_subprocess(zmq_url=None, server_args=[]):
     # where meshcat might have been added directly via sys.path.append.
     # Copy existing environmental variables as some of them might be needed
     # e.g. on Windows SYSTEMROOT and PATH
-    env = os.environ
-    my_env = {
-        'PYTHONPATH': os.path.dirname(os.path.dirname(os.path.dirname(__file__)))}
-    env.update(my_env)
-    kwargs = { 
+    env = dict(os.environ)
+    env["PYTHONPATH"] = os.path.dirname(os.path.dirname(os.path.dirname(__file__)))
+    kwargs = {
         'stdout': subprocess.PIPE,
         'stderr': subprocess.PIPE,
         'env': env