let cython know that we are using python3.

sspickle · sspickle · commit 861b55bc3423 · 2020-11-15T21:24:16.000-05:00
diff --git a/vpython/cyvector.pyx b/vpython/cyvector.pyx
@@ -1,3 +1,5 @@
+# cython: language_level=3
+
 from random import random
 
 # List of names imported from this module with import *

Original file line number	Diff line number	Diff line change
`@@ -1,3 +1,5 @@`
	`1`	`+# cython: language_level=3`
	`2`	`+`
`1`	`3`	`from random import random`
`2`	`4`
`3`	`5`	`# List of names imported from this module with import *`