Apply suggestions from code review

Co-authored-by: Victor Stinner <vstinner@python.org>

Author: vstinner

Doc/library/io.rst

@@ -773,9 +773,11 @@ than raw I/O does.
 
    .. method:: peek(size=0, /)
 
-      Return a copy of the buffer from the current position onwards without advancing the position.
+      Return a copy of the buffer from the current position onwards without
+      advancing the position.
 
-      If *size* is less than one or omitted, at most `DEFAULT_BUFFER_SIZE` bytes are returned.
+      If *size* is less than one or omitted, at most
+      :data:`DEFAULT_BUFFER_SIZE` bytes are returned.
       Otherwise, at most *size* bytes are returned.
       Return an empty :class:`bytes` object at EOF.
 

Doc/whatsnew/3.16.rst

@@ -96,7 +96,7 @@ gzip
 io
 --
 
-* Add :meth:`io.BytesIO.peek`.
+* Add :meth:`io.BytesIO.peek` method to read without advancing position.
   (Contributed by Marcel Martin in :gh:`90533`.)
 
 lzma

Lib/test/test_io/test_memoryio.py

@@ -619,7 +619,8 @@ def test_peek(self):
             self.assertEqual(memio.peek(), buf[:io.DEFAULT_BUFFER_SIZE])
             self.assertEqual(memio.peek(0), buf[:io.DEFAULT_BUFFER_SIZE])
             self.assertEqual(memio.peek(-1), buf[:io.DEFAULT_BUFFER_SIZE])
-            self.assertEqual(memio.peek(io.DEFAULT_BUFFER_SIZE + 100), buf[:io.DEFAULT_BUFFER_SIZE + 100])
+            self.assertEqual(memio.peek(io.DEFAULT_BUFFER_SIZE + 100),
+                             buf[:io.DEFAULT_BUFFER_SIZE + 100])
             self.assertEqual(memio.peek(io.DEFAULT_BUFFER_SIZE * 100), buf)
 
         # Current position beyond buffer end

Misc/NEWS.d/next/Library/2022-04-10-20-10-59.bpo-46375.8j1ogZ.rst

@@ -1 +1 @@
-Add :meth:`io.BytesIO.peek`.
+Add :meth:`io.BytesIO.peek` method to read without advancing position.