Improve the error message when there's trailing whitespace in a filename

1 files changed, 5 insertions, 0 deletions

diff --git a/paste/deploy/loadwsgi.py b/paste/deploy/loadwsgi.py
index 3bb820f..29e880d 100644
--- a/paste/deploy/loadwsgi.py
+++ b/paste/deploy/loadwsgi.py
@@ -324,6 +324,11 @@ class ConfigLoader(_Loader):
         # Stupid ConfigParser ignores files that aren't found, so
         # we have to add an extra check:
         if not os.path.exists(filename):
+            if filename.strip() != filename:
+                raise OSError(
+                    "File %r not found; trailing whitespace: "
+                    "did you try to use a # on the same line as a filename? "
+                    "(comments must be on their own line)" % filename)
             raise OSError(
                 "File %r not found" % filename)
         self.parser.read(filename)