python读取rar文件_在 python 中，如何读取由 7z 压缩的文本文件_python_酷徒编程知识库...

这允许你stream行。import os

import py7zlib

class SevenZFileError(py7zlib.ArchiveError):

pass

class SevenZFile(object):

@classmethod

def is_7zfile(cls, filepath):

""" Determine if filepath points to a valid 7z archive. """

is7z = False

fp = None

try:

fp = open(filepath, 'rb')

archive = py7zlib.Archive7z(fp)

n = len(archive.getnames())

is7z = True

finally:

if fp: fp.close()

return is7z

def __init__(self, filepath):

fp = open(filepath, 'rb')

self.filepath = filepath

self.archive = py7zlib.Archive7z(fp)

def __contains__(self, name):

return name in self.archive.getnames()

def bytestream(self, name):

""" Iterate stream of bytes from an archive member. """

if name not in self:

raise SevenZFileError('member %s not found in %s' %

(name, self.filepath))

else:

member = self.archive.getmember(name)

for byte in member.read():

if not byte: break

yield byte

def readlines(self, name):

""" Iterate lines from an archive member. """

linesep = os.linesep[-1]

line = ''

for ch in self.bytestream(name):

line += ch

if ch == linesep:

yield line

line = ''

if line: yield line

用法示例：import csv

if SevenZFile.is_7zfile('testing.csv.7z'):

sevenZfile = SevenZFile('testing.csv.7z')

if 'testing.csv' not in sevenZfile:

print 'testing.csv is not a member of testing.csv.7z'

else:

reader = csv.reader(sevenZfile.readlines('testing.csv'))

for row in reader:

print ', '.join(row)

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