1 files changed, 4 insertions, 1 deletions
diff --git a/Lib/fileinput.py b/Lib/fileinput.py
index 8af4a57..81a7545 100644
--- a/Lib/fileinput.py
+++ b/Lib/fileinput.py
@@ -315,7 +315,10 @@ class FileInput:
             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