1 files changed, 7 insertions, 0 deletions
diff --git a/Lib/wsgiref/util.py b/Lib/wsgiref/util.py
index 516fe89..1cff7a3 100644
--- a/Lib/wsgiref/util.py
+++ b/Lib/wsgiref/util.py
@@ -18,6 +18,13 @@ class FileWrapper:
             self.close = filelike.close
 
     def __getitem__(self,key):
+        import warnings
+        warnings.warn(
+            "FileWrapper's __getitem__ method ignores 'key' parameter. "
+            "Use iterator protocol instead.",
+            DeprecationWarning,
+            stacklevel=2
+        )
         data = self.filelike.read(self.blksize)
         if data:
             return data