Backport PR #2864: Fix %run -t -N<N> TypeError

Adds a test case and a fix for issue  #2784.

IPython/core/magics/execution.py

@@ -611,7 +611,7 b' python-profiler package from non-free.""")'
                                 t_sys = t1[1] - t0[1]
                                 print "\nIPython CPU timings (estimated):"
                                 print "Total runs performed:", nruns
-                                print "  Times  : %10.2f    %10.2f" % ('Total', 'Per run')
+                                print "  Times  : %10s   %10s" % ('Total', 'Per run')
                                 print "  User   : %10.2f s, %10.2f s." % (t_usr, t_usr / nruns)
                                 print "  System : %10.2f s, %10.2f s." % (t_sys, t_sys / nruns)
                             twall1 = time.time()

IPython/core/tests/test_run.py

@@ -248,3 +248,10 b' tclass.py: deleting object: C-third'
         na = os.path.join(mydir, 'nonascii.py')
         _ip.magic('run "%s"' % na)
         tt.assert_equals(_ip.user_ns['u'], u'Ўт№Ф')
+
+    def test_run_formatting(self):
+        """ Test that %run -t -N<N> does not raise a TypeError for N > 1."""
+        src = "pass"
+        self.mktmp(src)
+        _ip.magic('run -t -N 1 %s' % self.fname)
+        _ip.magic('run -t -N 10 %s' % self.fname)