add %pxconfig --[no-]verbose

IPython/parallel/client/magics.py

@@ -61,14 +61,22 b' def exec_args(f):'
     args = [
         magic_arguments.argument('-b', '--block', action="store_const",
             const=True, dest='block',
-            help="use blocking (sync) execution"
+            help="use blocking (sync) execution",
         ),
         magic_arguments.argument('-a', '--noblock', action="store_const",
             const=False, dest='block',
-            help="use non-blocking (async) execution"
+            help="use non-blocking (async) execution",
         ),
         magic_arguments.argument('-t', '--targets', type=str,
-        help="specify the targets on which to execute"
+            help="specify the targets on which to execute",
+        ),
+        magic_arguments.argument('--verbose', action="store_const",
+            const=True, dest="set_verbose",
+            help="print a message at each execution",
+        ),
+        magic_arguments.argument('--no-verbose', action="store_const",
+            const=False, dest="set_verbose",
+            help="don't print any messages",
         ),
     ]
     for a in args:
@@ -130,6 +138,8 b' class ParallelMagics(Magics):'
     view = None
     # last result cache for %pxresult
     last_result = None
+    # verbose flag
+    verbose = False
     
     def __init__(self, shell, view, suffix=''):
         self.view = view
@@ -171,6 +181,8 b' class ParallelMagics(Magics):'
             self.view.targets = self._eval_target_str(args.targets)
         if args.block is not None:
             self.view.block = args.block
+        if args.set_verbose is not None:
+            self.verbose = args.set_verbose
 
     @magic_arguments.magic_arguments()
     @output_args
@@ -234,7 +246,8 b' class ParallelMagics(Magics):'
             str_targets = str(targets[:4])[:-1] + ', ..., ' + str(targets[-4:])[1:]
         else:
             str_targets = str(targets)
-        print base + " execution on engine(s): %s" % str_targets
+        if self.verbose:
+            print base + " execution on engine(s): %s" % str_targets
         
         result = self.view.execute(cell, silent=False, block=False)
         self.last_result = result

IPython/parallel/tests/test_magics.py

@@ -88,7 +88,7 b' class TestParallelMagics(ClusterTestCase, ParametricTestCase):'
         
         for block in (True, False):
             v.block = block
-            
+            ip.magic("pxconfig --verbose")
             with capture_output() as io:
                 ip.run_cell_magic("px", "", "1")
             if block:
@@ -117,7 +117,7 b' class TestParallelMagics(ClusterTestCase, ParametricTestCase):'
             ip.run_cell_magic('px', '--group-outputs=engine', 'generate_output()')
         
         self.assertFalse('\n\n' in io.stdout)
-        lines = io.stdout.splitlines()[1:]
+        lines = io.stdout.splitlines()
         expected = [
             r'\[stdout:\d+\]',
             'stdout',
@@ -151,7 +151,7 b' class TestParallelMagics(ClusterTestCase, ParametricTestCase):'
             ip.run_cell_magic('px', '--group-outputs=order', 'generate_output()')
         
         self.assertFalse('\n\n' in io.stdout)
-        lines = io.stdout.splitlines()[1:]
+        lines = io.stdout.splitlines()
         expected = []
         expected.extend([
             r'\[stdout:\d+\]',
@@ -192,7 +192,7 b' class TestParallelMagics(ClusterTestCase, ParametricTestCase):'
             ip.run_cell_magic('px', '--group-outputs=type', 'generate_output()')
         
         self.assertFalse('\n\n' in io.stdout)
-        lines = io.stdout.splitlines()[1:]
+        lines = io.stdout.splitlines()
         
         expected = []
         expected.extend([
@@ -229,6 +229,7 b' class TestParallelMagics(ClusterTestCase, ParametricTestCase):'
         self.assertEquals(v['a'], [5])
         ip.magic('px a=10')
         self.assertEquals(v['a'], [10])
+        ip.magic('pxconfig --verbose')
         with capture_output() as io:
             ar = ip.magic('px print (a)')
         self.assertTrue(isinstance(ar, AsyncResult))
@@ -354,6 +355,7 b' class TestParallelMagics(ClusterTestCase, ParametricTestCase):'
         rc = self.client
         view = rc.activate(rc.ids)
         self.assertEquals(view.targets, rc.ids)
+        ip.magic('pxconfig --verbose')
         for cell in ("pass", "1/0"):
             with capture_output() as io:
                 try:
@@ -371,6 +373,7 b' class TestParallelMagics(ClusterTestCase, ParametricTestCase):'
         view = rc.activate(rc.ids)
         view.block = False
         self.assertEquals(view.targets, rc.ids)
+        ip.magic('pxconfig --verbose')
         for cell in ("pass", "1/0"):
             with capture_output() as io:
                 try: