使用zlib和cPickle将字典压缩/解压缩到文件

问题描述：

我正在使用python将zlib压缩和cPickled字典写入文件。它似乎工作，但是，我不知道如何重新读取文件。使用zlib和cPickle将字典压缩/解压缩到文件

我包括以下代码，其中包括我已尝试（和相关的错误消息）的几个事情。我无处可去。

import sys 
import cPickle as pickle 
import zlib 

testDict = { 'entry1':1.0, 'entry2':2.0 } 

with open('test.gz', 'wb') as fp: 
    fp.write(zlib.compress(pickle.dumps(testDict, pickle.HIGHEST_PROTOCOL),9)) 

attempt = 0 

try: 
    attempt += 1 
    with open('test.gz', 'rb') as fp: 
    step1 = zlib.decompress(fp) 
    successDict = pickle.load(step1) 
except Exception, e: 
    print "Failed attempt:", attempt, e 

try: 
    attempt += 1 
    with open('test.gz', 'rb').read() as fp: 
    step1 = zlib.decompress(fp) 
    successDict = pickle.load(step1) 
except Exception, e: 
    print "Failed attempt:", attempt, e 

try: 
    attempt += 1 
    with open('test.gz', 'rb') as fp: 
    step1 = zlib.decompress(fp.read()) 
    successDict = pickle.load(step1) 
except Exception, e: 
    print "Failed attempt:", attempt, e 

try: 
    attempt += 1 
    with open('test.gz', 'rb') as fp: 
    d = zlib.decompressobj() 
    step1 = fp.read() 
    step2 = d.decompress(step1) 
    step3 = pickle.load(step2) 
except Exception ,e: 
    print "Failed attempt:", attempt, e 

try: 
    attempt += 1 
    with open('test.gz', 'rb') as fp: 
    d = zlib.decompressobj() 
    step1 = fp.read() 
    step2 = d.decompress(step1) 
    step3 = pickle.load(step2) 
except Exception ,e: 
    print "Failed attempt:", attempt, e

我收到以下错误：

Failed attempt: 1 must be string or read-only buffer, not file 
Failed attempt: 2 __exit__ 
Failed attempt: 3 argument must have 'read' and 'readline' attributes 
Failed attempt: 4 argument must have 'read' and 'readline' attributes 
Failed attempt: 5 argument must have 'read' and 'readline' attributes

但愿这只是一些显而易见的（给别人）解决这个问题，我只是缺少。谢谢你的帮助！

答

你正在尝试次数3-5的错误是因为您使用pickle.load代替pickle.loads。前者需要一个类似文件的对象，而不是从解压缩调用中获得的字节字符串。

这将工作：

with open('test.gz', 'rb') as fp: 
    data = zlib.decompress(fp.read()) 
    successDict = pickle.loads(data)

答

根据泡菜手动你需要使用pickle.load*s*http://docs.python.org/release/2.5/lib/node317.html（去掉“*”很明显）

使用zlib和cPickle将字典压缩/解压缩到文件

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