Simple changes to make example notebooks Python 3 compatible

examples/notebooks/Animations Using clear_output.ipynb

@@ -59,7 +59,7 b''
       "for i in range(10):\n",
       "    time.sleep(0.25)\n",
       "    clear_output()\n",
-      "    print i\n",
+      "    print(i)\n",
       "    sys.stdout.flush()"
      ],
      "language": "python",

examples/notebooks/Cell Magics.ipynb

@@ -151,9 +151,10 b''
      "collapsed": false,
      "input": [
       "%%capture capt\n",
+      "from __future__ import print_function\n",
       "import sys\n",
-      "print 'Hello stdout'\n",
-      "print >> sys.stderr, 'and stderr'"
+      "print('Hello stdout')\n",
+      "print('and stderr', file=sys.stderr)"
      ],
      "language": "python",
      "metadata": {},
@@ -217,7 +218,7 b''
      "collapsed": false,
      "input": [
       "%%file foo.py\n",
-      "print 'Hello world'"
+      "print('Hello world')"
      ],
      "language": "python",
      "metadata": {},
@@ -471,8 +472,8 b''
      "cell_type": "code",
      "collapsed": false,
      "input": [
-      "print error\n",
-      "print output"
+      "print(error)\n",
+      "print(output)"
      ],
      "language": "python",
      "metadata": {},
@@ -563,7 +564,7 b''
      "cell_type": "code",
      "collapsed": false,
      "input": [
-      "print ruby_lines.read()"
+      "print(ruby_lines.read())"
      ],
      "language": "python",
      "metadata": {},
@@ -927,7 +928,7 b''
      "input": [
       "b = %R a=resid(lm(Y~X))\n",
       "%Rpull a\n",
-      "print a\n",
+      "print(a)\n",
       "assert id(b.data) == id(a.data)\n",
       "%R -o a"
      ],
@@ -963,10 +964,11 b''
      "cell_type": "code",
      "collapsed": false,
      "input": [
+      "from __future__ import print_function\n",
       "v1 = %R plot(X,Y); print(summary(lm(Y~X))); vv=mean(X)*mean(Y)\n",
-      "print 'v1 is:', v1\n",
+      "print('v1 is:', v1)\n",
       "v2 = %R mean(X)*mean(Y)\n",
-      "print 'v2 is:', v2"
+      "print('v2 is:', v2)"
      ],
      "language": "python",
      "metadata": {},