Make the select call in item 37 work on Windows

bslatkin · bslatkin · commit 96164f88db3b · 2015-10-03T13:10:05.000-07:00
diff --git a/example_code/item_37.py b/example_code/item_37.py
@@ -67,9 +67,15 @@ def run(self):
 
 # Example 6
 import select
+import socket
+
+# This is for supporting Windows specifically. Windows can't do a
+# select call with an empty list. Don't connect the socket to anything.
+# Waiting for it will do nothing.
+_s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
 
 def slow_systemcall():
-    select.select([], [], [], 0.1)
+    select.select([_s], [], [], 0.1)
 
 
 # Example 7
