--- a/checker.py	Mon Jun 13 23:35:59 2016 +0800
+++ b/checker.py	Mon Jun 13 23:38:17 2016 +0800
@@ -14,11 +14,6 @@
 rel = lambda *x: os.path.abspath(os.path.join(os.path.dirname(__file__), *x))
 
 
-def print_and_run(args):
-    print('$ ' + ' '.join(args))
-    check_call(args)
-
-
 def run_ignore_1(fn, args):
     try:
         return fn(args)
@@ -87,7 +82,7 @@
         print('# C&O task: setup')
 
         venv = '../venv'
-        print_and_run(['virtualenv', venv])
+        run(['virtualenv', venv])
         pip = os.path.join(venv, 'bin', 'pip')
         for linter in config['linters']:
             if 'pip' in linter: