Merged revisions 82039 via svnmerge from

svn+ssh://pythondev@svn.python.org/python/trunk

........
  r82039 | r.david.murray | 2010-06-16 21:36:52 -0400 (Wed, 16 Jun 2010) | 10 lines

  #8720: fix inspect regression by teaching getsourcefile about linecache.

  The fix for issue 4050 caused a regression:  before that fix, source
  lines in the linecache would eventually be found by inspect.  After the
  fix inspect reports an error earlier, and the source isn't found.
  The fix for the fix is to have getsourcefile look in the linecache for
  the file and return the psuedo-filename if the source is there, just as
  it already returns it if there is a PEP 302 loader.
........

3 files changed, 24 insertions, 1 deletions

diff --git a/Lib/inspect.py b/Lib/inspect.py
index ea30466..d6ac4e0 100644
--- a/Lib/inspect.py
+++ b/Lib/inspect.py
@@ -437,7 +437,9 @@ def getmodulename(path):
     if info: return info[0]
 
 def getsourcefile(object):
-    """Return the Python source file an object was defined in, if it exists."""
+    """Return the filename that can be used to locate an object's source.
+    Return None if no way can be identified to get the source.
+    """
     filename = getfile(object)
     if filename[-4:].lower() in ('.pyc', '.pyo'):
         filename = filename[:-4] + '.py'
@@ -450,6 +452,9 @@ def getsourcefile(object):
     # only return a non-existent filename if the module has a PEP 302 loader
     if hasattr(getmodule(object, filename), '__loader__'):
         return filename
+    # or it is in the linecache
+    if filename in linecache.cache:
+        return filename
 
 def getabsfile(object, _filename=None):
     """Return an absolute path to the source or compiled file for an object.
diff --git a/Lib/test/test_inspect.py b/Lib/test/test_inspect.py
index b89f8075..b515c1f 100644
--- a/Lib/test/test_inspect.py
+++ b/Lib/test/test_inspect.py
@@ -3,6 +3,7 @@ import sys
 import types
 import unittest
 import inspect
+import linecache
 import datetime
 import collections
 from os.path import normcase
@@ -275,6 +276,11 @@ class TestRetrievingSourceCode(GetSourceBase):
     def test_getsourcefile(self):
         self.assertEqual(normcase(inspect.getsourcefile(mod.spam)), modfile)
         self.assertEqual(normcase(inspect.getsourcefile(git.abuse)), modfile)
+        fn = "_non_existing_filename_used_for_sourcefile_test.py"
+        co = compile("None", fn, "exec")
+        self.assertEqual(normcase(inspect.getsourcefile(co)), None)
+        linecache.cache[co.co_filename] = (1, None, "None", co.co_filename)
+        self.assertEqual(normcase(inspect.getsourcefile(co)), fn)
 
     def test_getfile(self):
         self.assertEqual(inspect.getfile(mod.StupidGit), mod.__file__)
@@ -373,6 +379,15 @@ class TestBuggyCases(GetSourceBase):
         self.assertRaises(IOError, inspect.getsource, unicodedata)
         self.assertRaises(IOError, inspect.findsource, unicodedata)
 
+    def test_findsource_code_in_linecache(self):
+        lines = ["x=1"]
+        co = compile(lines[0], "_dynamically_created_file", "exec")
+        self.assertRaises(IOError, inspect.findsource, co)
+        self.assertRaises(IOError, inspect.getsource, co)
+        linecache.cache[co.co_filename] = (1, None, lines, co.co_filename)
+        self.assertEquals(inspect.findsource(co), (lines,0))
+        self.assertEquals(inspect.getsource(co), lines[0])
+
 # Helper for testing classify_class_attrs.
 def attrs_wo_objs(cls):
     return [t[:3] for t in inspect.classify_class_attrs(cls)]
diff --git a/Misc/NEWS b/Misc/NEWS
index 7f8ccef..0de8581 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -437,6 +437,9 @@ C-API
 Library
 -------
 
+- Issue #8720: fix regression caused by fix for #4050 by making getsourcefile
+  smart enough to find source files in the linecache.
+
 - Issue #5610: feedparser no longer eats extra characters at the end of
   a body part if the body part ends with a \r\n.