Fix getcomments() so that it doesn't fail with TypeErrors.

It appears that getcomments() can get called for classes defined in
C.  Since these don't have source code, it can't do anything useful.
A function buried many levels deep was raising a TypeError that was
not caught.

Who knows why this broke...

diff --git a/Lib/inspect.py b/Lib/inspect.py
index 175f5d6eb17f434d2a79034782a5acfe58a0deda..2b28d8ebe3e31be65dcf73926ea264e42196868c 100644 (file)
--- a/Lib/inspect.py
+++ b/Lib/inspect.py
@@ -416,9 +416,14 @@ def findsource(object):
     raise IOError, 'could not find code object'
 
 def getcomments(object):
-    """Get lines of comments immediately preceding an object's source code."""
-    try: lines, lnum = findsource(object)
-    except IOError: return None
+    """Get lines of comments immediately preceding an object's source code.
+
+    Returns None when source can't be found.
+    """
+    try:
+        lines, lnum = findsource(object)
+    except (IOError, TypeError):
+        return None
 
     if ismodule(object):
         # Look for a comment block at the top of the file.