Mercurial > cpython-lru_cache-weakref

diff Doc/tutorial/stdlib2.rst @ 44904:063ed377fd3d legacy-trunk

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Fix issue1789: The tutorial contained a misuse of the struct module. (also remove an unneeded import struct from test_largefile)
author Gregory P. Smith <greg@mad-scientist.com>
date Thu, 24 Jan 2008 09:38:26 +0000
parents 1e266015cf5b
children bc9fd84afdec
line wrap: on
line diff
--- a/Doc/tutorial/stdlib2.rst	Thu Jan 24 07:40:51 2008 +0000
+++ b/Doc/tutorial/stdlib2.rst	Thu Jan 24 09:38:26 2008 +0000
@@ -134,8 +134,10 @@
 
 The :mod:`struct` module provides :func:`pack` and :func:`unpack` functions for
 working with variable length binary record formats.  The following example shows
-how to loop through header information in a ZIP file (with pack codes ``"H"``
-and ``"L"`` representing two and four byte unsigned numbers respectively)::
+how to loop through header information in a ZIP file without using the
+:mod:`zipfile` module.  Pack codes ``"H"`` and ``"I"`` represent two and four
+byte unsigned numbers respectively.  The ``"<"`` indicates that they are
+standard size and in little-endian byte order::
 
    import struct
 
@@ -143,7 +145,7 @@
    start = 0
    for i in range(3):                      # show the first 3 file headers
        start += 14
-       fields = struct.unpack('LLLHH', data[start:start+16])
+       fields = struct.unpack('<IIIHH', data[start:start+16])
        crc32, comp_size, uncomp_size, filenamesize, extra_size = fields
 
        start += 16