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Diffstat (limited to 'Doc/tutorial/stdlib2.rst')
| -rw-r--r-- | Doc/tutorial/stdlib2.rst | 8 |
1 files changed, 5 insertions, 3 deletions
diff --git a/Doc/tutorial/stdlib2.rst b/Doc/tutorial/stdlib2.rst index 4e8d37e..bab0114 100644 --- a/Doc/tutorial/stdlib2.rst +++ b/Doc/tutorial/stdlib2.rst @@ -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 |