#17526: fix an IndexError raised while passing code without filename to inspect.findsource(). Initial patch by Tyler Doyle.

2 files changed, 7 insertions, 1 deletions

diff --git a/Lib/inspect.py b/Lib/inspect.py
index 7a7bb91b1b..7834d12ea7 100644
--- a/Lib/inspect.py
+++ b/Lib/inspect.py
@@ -550,7 +550,7 @@ def findsource(object):
 
     file = getfile(object)
     sourcefile = getsourcefile(object)
-    if not sourcefile and file[0] + file[-1] != '<>':
+    if not sourcefile and file[:1] + file[-1:] != '<>':
         raise IOError('source code not available')
     file = sourcefile if sourcefile else file
 
diff --git a/Lib/test/test_inspect.py b/Lib/test/test_inspect.py
index 6e3f04e68a..9f5e93b0c7 100644
--- a/Lib/test/test_inspect.py
+++ b/Lib/test/test_inspect.py
@@ -416,6 +416,12 @@ class TestBuggyCases(GetSourceBase):
         finally:
             del linecache.cache[co.co_filename]
 
+    def test_findsource_without_filename(self):
+        for fname in ['', '<string>']:
+            co = compile('x=1', fname, "exec")
+            self.assertRaises(IOError, inspect.findsource, co)
+            self.assertRaises(IOError, inspect.getsource, co)
+
 class TestNoEOL(GetSourceBase):
     def __init__(self, *args, **kwargs):
         self.tempdir = TESTFN + '_dir'