From a1213caa7f75b44482c0d9252901a17498804bd5 Mon Sep 17 00:00:00 2001
From: Inada Naoki <songofacandy@gmail.com>
Date: Mon, 18 Oct 2021 10:41:04 +0900
Subject: [PATCH 1/2] Revert "bpo-43787: Add __iter__ to GzipFile, BZ2File, and
 LZMAFile (GH-25353)"

This reverts commit d2a8e69c2c605fbaa3656a5f99aa8d295f74c80e.
---
 Lib/bz2.py  | 4 ----
 Lib/gzip.py | 4 ----
 Lib/lzma.py | 4 ----
 3 files changed, 12 deletions(-)

diff --git a/Lib/bz2.py b/Lib/bz2.py
index 7f1d20632ef139..fabe4f73c8d808 100644
--- a/Lib/bz2.py
+++ b/Lib/bz2.py
@@ -197,10 +197,6 @@ def readline(self, size=-1):
         self._check_can_read()
         return self._buffer.readline(size)
 
-    def __iter__(self):
-        self._check_can_read()
-        return self._buffer.__iter__()
-
     def readlines(self, size=-1):
         """Read a list of lines of uncompressed bytes from the file.
 
diff --git a/Lib/gzip.py b/Lib/gzip.py
index 0dddb51553fabd..ac1781042b2640 100644
--- a/Lib/gzip.py
+++ b/Lib/gzip.py
@@ -398,10 +398,6 @@ def readline(self, size=-1):
         self._check_not_closed()
         return self._buffer.readline(size)
 
-    def __iter__(self):
-        self._check_not_closed()
-        return self._buffer.__iter__()
-
 
 def _read_exact(fp, n):
     '''Read exactly *n* bytes from `fp`
diff --git a/Lib/lzma.py b/Lib/lzma.py
index 9abf06d91db184..800f52198fbb79 100644
--- a/Lib/lzma.py
+++ b/Lib/lzma.py
@@ -221,10 +221,6 @@ def readline(self, size=-1):
         self._check_can_read()
         return self._buffer.readline(size)
 
-    def __iter__(self):
-        self._check_can_read()
-        return self._buffer.__iter__()
-
     def write(self, data):
         """Write a bytes object to the file.
 

From 99da4aad05f83b2333ec7073bd7a496bb52d6086 Mon Sep 17 00:00:00 2001
From: Inada Naoki <songofacandy@gmail.com>
Date: Mon, 18 Oct 2021 10:47:08 +0900
Subject: [PATCH 2/2] Add NEWS entry.

---
 .../next/Library/2021-10-18-10-46-47.bpo-45475.sb9KDF.rst     | 4 ++++
 1 file changed, 4 insertions(+)
 create mode 100644 Misc/NEWS.d/next/Library/2021-10-18-10-46-47.bpo-45475.sb9KDF.rst

diff --git a/Misc/NEWS.d/next/Library/2021-10-18-10-46-47.bpo-45475.sb9KDF.rst b/Misc/NEWS.d/next/Library/2021-10-18-10-46-47.bpo-45475.sb9KDF.rst
new file mode 100644
index 00000000000000..6fce894e6e4d49
--- /dev/null
+++ b/Misc/NEWS.d/next/Library/2021-10-18-10-46-47.bpo-45475.sb9KDF.rst
@@ -0,0 +1,4 @@
+Reverted optimization of iterating :class:`gzip.GzipFile`,
+:class:`bz2.BZ2File`, and :class:`lzma.LZMAFile` (see bpo-43787) because it
+caused regression when user iterate them without having reference of them.
+Patch by Inada Naoki.