demos/demo_onset.py: simplify imports

diff --git a/python/demos/demo_onset.py b/python/demos/demo_onset.py
index 75c6f1c54f9cabb24f1ea97864f4bb3f9c609112..55b3c695504ea750c9a7cd7509edd084f19e4ec2 100755 (executable)
--- a/python/demos/demo_onset.py
+++ b/python/demos/demo_onset.py
@@ -1,8 +1,7 @@
 #! /usr/bin/env python
 
 import sys
-from aubio import onset, source
-from numpy import array, hstack, zeros
+from aubio import source, onset
 
 win_s = 512                 # fft size
 hop_s = win_s / 2           # hop size