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Fix issue1789: The tutorial contained a misuse of the struct module. 

(also remove an unneeded import struct from test_largefile)
This commit is contained in:
Gregory P. Smith 2008-01-24 09:38:26 +00:00
parent 7070094d7f
commit 7b7ce7854c
3 changed files with 8 additions and 6 deletions
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4
Doc/library/struct.rst
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@ -85,7 +85,7 @@ Python values should be obvious given their types:
+--------+-------------------------+--------------------+-------+
| ``i`` | :ctype:`int` | integer | |
+--------+-------------------------+--------------------+-------+
| ``I`` | :ctype:`unsigned int` | long | |
| ``I`` | :ctype:`unsigned int` | integer or long | |
+--------+-------------------------+--------------------+-------+
| ``l`` | :ctype:`long` | integer | |
+--------+-------------------------+--------------------+-------+
@ -104,7 +104,7 @@ Python values should be obvious given their types:
+--------+-------------------------+--------------------+-------+
| ``p`` | :ctype:`char[]` | string | |
+--------+-------------------------+--------------------+-------+
| ``P`` | :ctype:`void \*` | integer | |
| ``P`` | :ctype:`void \*` | long | |
+--------+-------------------------+--------------------+-------+
Notes:

8
Doc/tutorial/stdlib2.rst
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@ -134,8 +134,10 @@ Working with Binary Data Record Layouts
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 @@ and ``"L"`` representing two and four byte unsigned numbers respectively)::
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

2
Lib/test/test_largefile.py
View File

@ -6,7 +6,7 @@
#----------------------------------------------------------------------
from test import test_support
import os, struct, stat, sys
import os, stat, sys
try:
import signal