Backport 1.40 and 1.41 so that inspect isn't fooled by single line

definitions, pass statements, and lambdas.

Lib/inspect.py

@@ -410,7 +410,7 @@ def findsource(object):
         if not hasattr(object, 'co_firstlineno'):
             raise IOError, 'could not find function definition'
         lnum = object.co_firstlineno - 1
-        pat = re.compile(r'^\s*def\s')
+        pat = re.compile(r'^(\s*def\s)|(.*\slambda(:|\s))')
         while lnum > 0:
             if pat.match(lines[lnum]): break
             lnum = lnum - 1
@@ -489,6 +489,8 @@ class BlockFinder:
         elif type == tokenize.DEDENT:
             self.indent = self.indent - 1
             if self.indent == 0: raise EndOfBlock, self.last
+        elif type == tokenize.NAME and scol == 0:
+            raise EndOfBlock, self.last
 
 def getblock(lines):
     """Extract the block of code at the top of the given list of lines."""
@@ -496,6 +498,8 @@ def getblock(lines):
         tokenize.tokenize(ListReader(lines).readline, BlockFinder().tokeneater)
     except EndOfBlock, eob:
         return lines[:eob.args[0]]
+    # Fooling the indent/dedent logic implies a one-line definition
+    return lines[:1]
 
 def getsourcelines(object):
     """Return a list of source lines and starting line number for an object.