判斷是否是ZIP檔案

用zipfile.is_zipfile判斷。

import zipfile

print(zipfile.is_zipfile('samples/archive.zip'))

True

ZipFile可以直接操作ZIP，支援讀取資料以及對其修改。

讀取檔案資訊

List出來archive檔案裡內容，用namelist 和 infolist方法。返回list of filenames或list of ZipInfo instances。

import zipfile
zf = zipfile.ZipFile('samples/archive.zip'
 
,'r')

# list filenames
for name in zf.namelist():
    print name,

a.txt b.txt c.txt

# list file infomation
for info in zf.infolist():
    print info.filename, info.date_time, info.file_size

a.txt (2016, 7, 15, 0, 5, 58) 2
b.txt (2016, 7, 15, 0, 6, 8) 2
c.txt (2016, 7, 15, 0, 6, 14) 2

提取資料read()

用read()方法，以filename作為引數，以string形式返回資料。

zf = zipfile.ZipFile('samples/archive.zip')
for filename in zf.namelist():
    # can use other than namelist,['there.txt','notthere.txt']
    try:
        data = zf.read(filename) # extract use read()
    except KeyError:
        print "Error: Did not find %s in zip file"
 
 % filename
    else:
        print filename, ':',
        print repr(data)

a.txt : 'a\n'
b.txt : 'b\n'
c.txt : 'c\n'

解壓資料extract()

zf = zipfile.ZipFile('samples/archive.zip','r')
# Extract a member from the archive to the current working directory
zf.extract('a.txt') # you may want to specify path param

# Extract all members from the archive to the current working directory
zf.extractall() # you may want to specify path param

壓縮資料

建立新的zip檔案，只需要初始化一個新的ZipFile即可，用w模式，要新增資料，用write()方法即可。

print('creating archive')
zf = zipfile.ZipFile('zipfile_write.zip',mode='w')
try:
    print('adding readme.txt')
    zf.write('readme.txt')
finally:
    print('closing')
    zf.close()

creating archive
adding readme.txt
closing

但是預設沒有隻是打包，沒有壓縮資料，如果壓縮，需要用zlib模組。預設壓縮模式zipfile.ZIP_STORED，可以改變為zipfile.ZIP_DEFLATED。

# try to change compression type
try:
    import zlib
    compression = zipfile.ZIP_DEFLATED
except:
    compression = zipfile.ZIP_STORED

modes = {zipfile.ZIP_DEFLATED: 'deflated', zipfile.ZIP_STORED: 'stored'}
print('creating archive')
zf = zipfile.ZipFile('zipfile_write_compression.zip',mode='w')
try:
    print('adding README.txt with compression mode'+ str(modes[compression]))
    zf.write('readme.txt',compress_type=compression)
finally:
    print('closing')
    zf.close()

creating archive
adding README.txt with compression modedeflated
closing

Ref: