在Python的标准库中，_winreg.pyd可以操作Windows的注册表，另外第三方的win32库封装了大量的Windows API，使用起来也很方便。不过这里介绍的是使用_winreg操作注册表，毕竟是Python自带的标准库，无需安装第三方库。
下面的例子是通过Python获取Windows XP下已经安装的补丁号。Windows的补丁号都在“HKEY_LOCAL_MACHINESOFTWARE\Microsoft\Updates”下，通过循环下面所有的目录节点，如果找到的名称符合正则表达式KB(d{6}).*，则表示是一个补丁号。
从例子可以看出操作起来非常的简单和快速。
# -*- coding: utf-8 -*-
# 获取Windows的已打的补丁号
from _winreg import *
import re
def subRegKey(key, pattern, patchlist):
# 个数
count = QueryInfoKey(key)[0]
for index in range(count):
# 获取标题
name = EnumKey(key, index)
result = patch.match(name)
if result:
patchlist.append(result.group(1))
sub = OpenKey(key, name)
subRegKey(sub, pattern, patchlist)
CloseKey(sub)
if __name__ == '__main__':
patchlist = []
updates = 'SOFTWARE\Microsoft\Updates'
patch = re.compile('(KBd{6}).*')
key = OpenKey(HKEY_LOCAL_MACHINE, updates)
subRegKey(key, patch, patchlist)
print 'Count: ' + str(len(patchlist))
for p in patchlist:
print p
CloseKey(key)
下面内容转自 Python Standard Library12.13 The _winreg Module
(Windows only, New in 2.0) The _winreg module provides a basic interface to the Windows registry database. Example 12-17 demonstrates the module.
Example 12-17. Using the _winreg Module
File: winreg-example-1.py
import _winreg
explorer = _winreg.OpenKey(
_winreg.HKEY_CURRENT_USER,
"Software\Microsoft\WindowsCurrentVersion\Explorer"
)
#list values owned by this registry key
try:
i = 0
while 1:
name, value, type= _winreg.EnumValue(explorer, i)
print repr(name),
i += 1
except WindowsError:
print
value, type = _winreg.QueryValueEx(explorer, "Logon User Name")
print
print "user is", repr(value)
'Logon User Name' 'CleanShutdown' 'ShellState' 'Shutdown Setting'
'Reason Setting' 'FaultCount' 'FaultTime' 'IconUnderline'...
user is u'Effbot'