保存蟒蛇plistlib數據（修訂）

Question

如何使用此工作代碼：

import plistlib, time 
import zipfile 


from contextlib import closing 
import os 



with closing(zipfile.ZipFile("fw.zip")) as zfile: 
    for info in zfile.infolist(): 
     if info.filename.endswith('Restore.plist'): 
      zfile.extract(info) 

import plistlib as pl 
p=pl.readPlist("Restore.plist") 
print p["ProductType"] 
print p["ProductVersion"] 
print p["ProductBuildVersion"] 
outputfile = open('output.txt', 'w') 
outputfile.write(p["ProductVersion"]) 
outputfile.write(' ') 
outputfile.write(p["ProductType"]) 
outputfile.write(' ') 
outputfile.write(p["ProductBuildVersion"]) 
outputfile.close() 

，並用它在這個plist中的「更新」鍵寫出來的字符串，看到更新的關鍵是如何在另一個一組名爲「RestoreRamDisks」的按鍵？

<key>RestoreRamDisks</key>#this is the key that the "update" key is under 
<dict> 
    <key>Update</key>#here is the update key I'm talking about 
    <string>018-7074-092.dmg</string>#this is what I want python to spit out 
    <key>User</key> 
    <string>018-7082-092.dmg</string> 
</dict> 

爲了澄清，我只是想用上面的同樣的方法來獲取「更新」鍵的信息。令我困惑的部分是「更新」鍵在另一個名爲「RestoreRamDisks」的鍵下。當要求定位「更新」鍵時，我希望此程序吐出018-7074-092.dmg ..

Answer 1

當您時會發生什麼？你可以簡單地通過做

p["RestoreRamDisks"]["Update"] 
# If your plist may not contain a key called "RestoreRamDisks" 
# use this instead 
p.get("RestoreRamDisks", dict(Update=None)).get("Update", None) 
# This will get the value if available, otherwise it will 
# evaluate to None