return decorator
+
+from inspect import getsourcefile
+
+def frame_codeinfo(fframe, back=0):
+ """ Return a (filename, line) pair for a previous frame .
+ @return (filename, lineno) where lineno is either int or string==''
+ """
+
+ try:
+ if not fframe:
+ return ("<unknown>", '')
+ for i in range(back):
+ fframe = fframe.f_back
+ try:
+ fname = getsourcefile(fframe)
+ except TypeError:
+ fname = '<builtin>'
+ lineno = fframe.f_lineno or ''
+ return (fname, lineno)
+ except Exception:
+ return ("<unknown>", '')