Fix issue1789: The tutorial contained a misuse of the struct module.
(also remove an unneeded import struct from test_largefile)
diff --git a/Doc/tutorial/stdlib2.rst b/Doc/tutorial/stdlib2.rst
index 14c60dd..73a896d 100644
--- a/Doc/tutorial/stdlib2.rst
+++ b/Doc/tutorial/stdlib2.rst
@@ -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