From 4fc8285cd0bf0789f0b384c1b31bf05a28f48658 2012-08-01 00:23:35
From: Bradley M. Froehle <brad.froehle@gmail.com>
Date: 2012-08-01 00:23:35
Subject: [PATCH] Print message on stderr if annotated html cannot be read.
---
diff --git a/IPython/extensions/cythonmagic.py b/IPython/extensions/cythonmagic.py
index edb2e03..c71ed2c 100644
--- a/IPython/extensions/cythonmagic.py
+++ b/IPython/extensions/cythonmagic.py
@@ -15,6 +15,8 @@ Parts of this code were taken from Cython.inline.
# The full license is in the file COPYING.txt, distributed with this software.
#-----------------------------------------------------------------------------
+from __future__ import print_function
+
import io
import os, sys
import imp
@@ -194,9 +196,19 @@ class CythonMagics(Magics):
if args.annotate:
html_file = os.path.join(lib_dir, module_name + '.html')
- with io.open(html_file, encoding='utf-8') as f:
- annotated_html = f.read()
- return display.HTML(annotated_html)
+ try:
+ with io.open(html_file, encoding='utf-8') as f:
+ annotated_html = f.read()
+ except IOError as e:
+ # File could not be opened. Most likely the user has a version
+ # of Cython before 0.15.1 (when `cythonize` learned the
+ # `force` keyword argument) and has already compiled this
+ # exact source without annotation.
+ print('Cython completed successfully but the annotated '
+ 'source could not be read.', file=sys.stderr)
+ print(e, file=sys.stderr)
+ else:
+ return display.HTML(annotated_html)
_loaded = False