--- /home/rito/.anyenv/envs/pyenv/versions/3.5.0/lib/python3.5/fileinput.py	2015-09-16 08:52:23.420213192 +0900
+++ fileinput.py	2015-10-29 23:00:37.999920540 +0900
@@ -315,7 +315,10 @@
             return line
         if not self._file:
             if not self._files:
-                return ""
+                if 'b' in self._mode:
+                    return b""
+                else:
+                    return ""
             self._filename = self._files[0]
             self._files = self._files[1:]
             self._filelineno = 0