#13510: clarify that f.readlines() is note necessary to iterate over a file. Patch by Dan Riti.

Doc/library/io.rst

@@ -298,6 +298,9 @@ I/O Base Classes
       to control the number of lines read: no more lines will be read if the
       total size (in bytes/characters) of all lines so far exceeds *hint*.
 
+      Note that it's already possible to iterate on file objects using ``for
+      line in file: ...`` without calling ``file.readlines()``.
+
    .. method:: seek(offset, whence=SEEK_SET)
 
       Change the stream position to the given byte *offset*.  *offset* is

Doc/tutorial/inputoutput.rst

@@ -300,18 +300,8 @@ containing only a single newline.  ::
    >>> f.readline()
    ''
 
-``f.readlines()`` returns a list containing all the lines of data in the file.
-If given an optional parameter *sizehint*, it reads that many bytes from the
-file and enough more to complete a line, and returns the lines from that.  This
-is often used to allow efficient reading of a large file by lines, but without
-having to load the entire file in memory.  Only complete lines will be returned.
-::
-
-   >>> f.readlines()
-   ['This is the first line of the file.\n', 'Second line of the file\n']
-
-An alternative approach to reading lines is to loop over the file object. This is
-memory efficient, fast, and leads to simpler code::
+For reading lines from a file, you can loop over the file object. This is memory
+efficient, fast, and leads to simple code::
 
    >>> for line in f:
    ...     print(line, end='')
@@ -319,9 +309,8 @@ memory efficient, fast, and leads to simpler code::
    This is the first line of the file.
    Second line of the file
 
-The alternative approach is simpler but does not provide as fine-grained
-control.  Since the two approaches manage line buffering differently, they
-should not be mixed.
+If you want to read all the lines of a file in a list you can also use
+``list(f)`` or ``f.readlines()``.
 
 ``f.write(string)`` writes the contents of *string* to the file, returning
 the number of characters written. ::

Misc/ACKS

@@ -1003,6 +1003,7 @@ Nicholas Riley
 Jean-Claude Rimbault
 Vlad Riscutia
 Wes Rishel
+Dan Riti
 Juan M. Bello Rivas
 Davide Rizzo
 Anthony Roach