在python脚本中读取tar文件内容而不解压它 [英] reading tar file contents without untarring it, in python script

问题描述

我有一个 tar 文件，里面有很多文件.我需要编写一个 python 脚本，该脚本将读取文件的内容并给出总字符数，包括字母总数、空格、换行符等所有内容，而无需解压 tar 文件.

解决方案

你可以使用getmembers()

<预><代码>>>>导入 tarfile>>>tar = tarfile.open("test.tar")>>>目标.getmembers()

之后，您可以使用 extractfile() 将成员提取为文件对象.举个例子

import tarfile,os导入系统os.chdir("/tmp/foo")tar = tarfile.open("test.tar")对于 tar.getmembers() 中的成员:f=tar.extractfile(成员)内容=f.read()打印 "%s 有 %d 个换行符" %(member, content.count("\n"))打印 "%s 有 %d 个空格" % (member,content.count(" "))打印 "%s 有 %d 个字符" % (member, len(content))系统退出()tar.close()

对于上面例子中的文件对象f，你可以使用read()、readlines()等

I have a tar file which has number of files within it. I need to write a python script which will read the contents of the files and gives the count o total characters, including total number of letters, spaces, newline characters, everything, without untarring the tar file.

解决方案

you can use getmembers()

>>> import  tarfile
>>> tar = tarfile.open("test.tar")
>>> tar.getmembers()

After that, you can use extractfile() to extract the members as file object. Just an example

import tarfile,os
import sys
os.chdir("/tmp/foo")
tar = tarfile.open("test.tar")
for member in tar.getmembers():
    f=tar.extractfile(member)
    content=f.read()
    print "%s has %d newlines" %(member, content.count("\n"))
    print "%s has %d spaces" % (member,content.count(" "))
    print "%s has %d characters" % (member, len(content))
    sys.exit()
tar.close()

With the file object f in the above example, you can use read(), readlines() etc.

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