bind: test buffer protocol

Change-Id: I41744bf84a6dc87ee8a372e490068465c248ddd1

_examples/hi/test.py

@@ -157,6 +157,7 @@ except Exception, err:
 arr[1] = 42
 print "arr:",arr
 print "len(arr):",len(arr)
+print "mem(arr):",len(memoryview(arr))
 
 print "--- testing slice..."
 s = hi.GetIntSlice()
@@ -173,4 +174,5 @@ except Exception, err:
 s[1] = 42
 print "slice:",s
 print "len(slice):",len(s)
+print "mem(slice):",len(memoryview(s))
 

main_test.go

@@ -145,6 +145,7 @@ arr[1]: 2
 arr[2]: caught: array index out of range
 arr: [2]int{1, 42}
 len(arr): 2
+mem(arr): 2
 --- testing slice...
 slice: []int{1, 2}
 len(slice): 2
@@ -153,6 +154,7 @@ slice[1]: 2
 slice[2]: caught: array index out of range
 slice: []int{1, 42}
 len(slice): 2
+mem(slice): 2
 `)
 	buf := new(bytes.Buffer)
 	cmd = exec.Command("python2", "./test.py")