OXIESEC PANEL

Name	Size	Modified	Perms
📁 ..	-	10/28/2024 06:50:42 AM	rwxr-xr-x
📄 BaseHTTPServer.py	22.21 KB	03/08/2023 06:40:28 PM	rw-r--r--
📄 Bastion.py	5.61 KB	03/08/2023 06:40:28 PM	rw-r--r--
📄 CGIHTTPServer.py	12.78 KB	03/08/2023 06:40:28 PM	rw-r--r--
📄 ConfigParser.py	27.1 KB	03/08/2023 06:40:28 PM	rw-r--r--
📄 Cookie.py	25.92 KB	03/08/2023 06:40:28 PM	rw-r--r--
📄 DocXMLRPCServer.py	10.52 KB	03/08/2023 06:40:28 PM	rw-r--r--
📄 HTMLParser.py	16.77 KB	03/08/2023 06:40:28 PM	rw-r--r--
📄 LICENSE.txt	12.47 KB	03/08/2023 06:40:28 PM	rw-r--r--
📄 MimeWriter.py	6.33 KB	03/08/2023 06:40:28 PM	rw-r--r--
📄 Queue.py	8.38 KB	03/08/2023 06:40:28 PM	rw-r--r--
📄 SimpleHTTPServer.py	7.81 KB	03/08/2023 06:40:28 PM	rw-r--r--
📄 SimpleXMLRPCServer.py	25.21 KB	03/08/2023 06:40:28 PM	rw-r--r--
📄 SocketServer.py	23.39 KB	03/08/2023 06:40:28 PM	rw-r--r--
📄 StringIO.py	10.41 KB	03/08/2023 06:40:28 PM	rw-r--r--
📄 UserDict.py	6.89 KB	03/08/2023 06:40:28 PM	rw-r--r--
📄 UserList.py	3.56 KB	03/08/2023 06:40:28 PM	rw-r--r--
📄 UserString.py	9.46 KB	03/08/2023 06:40:28 PM	rwxr-xr-x
📄 _LWPCookieJar.py	6.4 KB	03/08/2023 06:40:28 PM	rw-r--r--
📄 _MozillaCookieJar.py	5.66 KB	03/08/2023 06:40:28 PM	rw-r--r--
📄 __future__.py	4.28 KB	03/08/2023 06:40:28 PM	rw-r--r--
📄 __phello__.foo.py	64 bytes	03/08/2023 06:40:28 PM	rw-r--r--
📄 _abcoll.py	18.18 KB	03/08/2023 06:40:28 PM	rw-r--r--
📄 _osx_support.py	18.65 KB	03/08/2023 06:40:28 PM	rw-r--r--
📄 _pyio.py	68 KB	03/08/2023 06:40:28 PM	rw-r--r--
📄 _strptime.py	20.24 KB	03/08/2023 06:40:28 PM	rw-r--r--
📄 _sysconfigdata.py	126 bytes	03/08/2023 06:40:28 PM	rw-r--r--
📄 _threading_local.py	7.09 KB	03/08/2023 06:40:28 PM	rw-r--r--
📄 _weakrefset.py	5.77 KB	03/08/2023 06:40:28 PM	rw-r--r--
📄 abc.py	6.98 KB	03/08/2023 06:40:28 PM	rw-r--r--
📄 aifc.py	33.77 KB	03/08/2023 06:40:28 PM	rw-r--r--
📄 antigravity.py	60 bytes	03/08/2023 06:40:28 PM	rw-r--r--
📄 anydbm.py	2.6 KB	03/08/2023 06:40:28 PM	rw-r--r--
📄 argparse.egg-info	217 bytes	03/08/2023 06:40:28 PM	rw-r--r--
📄 argparse.py	87.14 KB	03/08/2023 06:40:28 PM	rw-r--r--
📄 ast.py	11.53 KB	03/08/2023 06:40:28 PM	rw-r--r--
📄 asynchat.py	11.31 KB	03/08/2023 06:40:28 PM	rw-r--r--
📄 asyncore.py	20.45 KB	03/08/2023 06:40:28 PM	rw-r--r--
📄 atexit.py	1.67 KB	03/08/2023 06:40:28 PM	rw-r--r--
📄 audiodev.py	7.42 KB	03/08/2023 06:40:28 PM	rw-r--r--
📄 base64.py	11.53 KB	03/08/2023 06:40:28 PM	rwxr-xr-x
📄 bdb.py	21.21 KB	03/08/2023 06:40:28 PM	rw-r--r--
📄 binhex.py	14.35 KB	03/08/2023 06:40:28 PM	rw-r--r--
📄 bisect.py	2.53 KB	03/08/2023 06:40:28 PM	rw-r--r--
📁 bsddb	-	05/09/2024 07:14:10 AM	rwxr-xr-x
📄 cProfile.py	6.42 KB	03/08/2023 06:40:28 PM	rwxr-xr-x
📄 calendar.py	22.84 KB	03/08/2023 06:40:28 PM	rw-r--r--
📄 cgi.py	34.96 KB	03/08/2023 06:40:28 PM	rwxr-xr-x
📄 cgitb.py	11.89 KB	03/08/2023 06:40:28 PM	rw-r--r--
📄 chunk.py	5.29 KB	03/08/2023 06:40:28 PM	rw-r--r--
📄 cmd.py	14.67 KB	03/08/2023 06:40:28 PM	rw-r--r--
📄 code.py	9.95 KB	03/08/2023 06:40:28 PM	rw-r--r--
📄 codecs.py	35.3 KB	03/08/2023 06:40:28 PM	rw-r--r--
📄 codeop.py	5.86 KB	03/08/2023 06:40:28 PM	rw-r--r--
📄 collections.py	27.15 KB	03/08/2023 06:40:28 PM	rw-r--r--
📄 colorsys.py	3.6 KB	03/08/2023 06:40:28 PM	rw-r--r--
📄 commands.py	2.49 KB	03/08/2023 06:40:28 PM	rw-r--r--
📄 compileall.py	7.58 KB	03/08/2023 06:40:28 PM	rw-r--r--
📁 compiler	-	05/09/2024 07:14:10 AM	rwxr-xr-x
📁 config-x86_64-linux-gnu	-	05/09/2024 07:14:10 AM	rwxr-xr-x
📄 contextlib.py	4.32 KB	03/08/2023 06:40:28 PM	rw-r--r--
📄 cookielib.py	63.9 KB	03/08/2023 06:40:28 PM	rw-r--r--
📄 copy.py	11.26 KB	03/08/2023 06:40:28 PM	rw-r--r--
📄 copy_reg.py	6.81 KB	03/08/2023 06:40:28 PM	rw-r--r--
📄 csv.py	16.32 KB	03/08/2023 06:40:28 PM	rw-r--r--
📁 ctypes	-	05/09/2024 07:14:10 AM	rwxr-xr-x
📁 curses	-	05/09/2024 07:14:10 AM	rwxr-xr-x
📄 dbhash.py	498 bytes	03/08/2023 06:40:28 PM	rw-r--r--
📄 decimal.py	216.73 KB	03/08/2023 06:40:28 PM	rw-r--r--
📄 difflib.py	80.4 KB	03/08/2023 06:40:28 PM	rw-r--r--
📄 dircache.py	1.1 KB	03/08/2023 06:40:28 PM	rw-r--r--
📄 dis.py	6.35 KB	03/08/2023 06:40:28 PM	rw-r--r--
📁 dist-packages	-	05/09/2024 07:14:10 AM	rwxr-xr-x
📁 distutils	-	05/09/2024 07:14:10 AM	rwxr-xr-x
📄 doctest.py	102.63 KB	03/08/2023 06:40:28 PM	rw-r--r--
📄 dumbdbm.py	8.93 KB	03/08/2023 06:40:28 PM	rw-r--r--
📄 dummy_thread.py	4.31 KB	03/08/2023 06:40:28 PM	rw-r--r--
📄 dummy_threading.py	2.74 KB	03/08/2023 06:40:28 PM	rw-r--r--
📁 email	-	05/09/2024 07:14:10 AM	rwxr-xr-x
📁 encodings	-	05/09/2024 07:14:10 AM	rwxr-xr-x
📁 ensurepip	-	05/09/2024 07:14:10 AM	rwxr-xr-x
📄 filecmp.py	9.36 KB	03/08/2023 06:40:28 PM	rw-r--r--
📄 fileinput.py	13.42 KB	03/08/2023 06:40:28 PM	rw-r--r--
📄 fnmatch.py	3.24 KB	03/08/2023 06:40:28 PM	rw-r--r--
📄 formatter.py	14.56 KB	03/08/2023 06:40:28 PM	rw-r--r--
📄 fpformat.py	4.62 KB	03/08/2023 06:40:28 PM	rw-r--r--
📄 fractions.py	21.87 KB	03/08/2023 06:40:28 PM	rw-r--r--
📄 ftplib.py	37.65 KB	03/08/2023 06:40:28 PM	rw-r--r--
📄 functools.py	4.69 KB	03/08/2023 06:40:28 PM	rw-r--r--
📄 genericpath.py	3.13 KB	03/08/2023 06:40:28 PM	rw-r--r--
📄 getopt.py	7.15 KB	03/08/2023 06:40:28 PM	rw-r--r--
📄 getpass.py	5.43 KB	03/08/2023 06:40:28 PM	rw-r--r--
📄 gettext.py	22.48 KB	03/08/2023 06:40:28 PM	rw-r--r--
📄 glob.py	3.04 KB	03/08/2023 06:40:28 PM	rw-r--r--
📄 gzip.py	18.58 KB	03/08/2023 06:40:28 PM	rw-r--r--
📄 hashlib.py	7.66 KB	03/08/2023 06:40:28 PM	rw-r--r--
📄 heapq.py	17.87 KB	03/08/2023 06:40:28 PM	rw-r--r--
📄 hmac.py	4.48 KB	03/08/2023 06:40:28 PM	rw-r--r--
📁 hotshot	-	05/09/2024 07:14:10 AM	rwxr-xr-x
📄 htmlentitydefs.py	17.63 KB	03/08/2023 06:40:28 PM	rw-r--r--
📄 htmllib.py	12.57 KB	03/08/2023 06:40:28 PM	rw-r--r--
📄 httplib.py	51.72 KB	03/08/2023 06:40:28 PM	rw-r--r--
📄 ihooks.py	18.54 KB	03/08/2023 06:40:28 PM	rw-r--r--
📄 imaplib.py	47.23 KB	03/08/2023 06:40:28 PM	rw-r--r--
📄 imghdr.py	3.46 KB	03/08/2023 06:40:28 PM	rw-r--r--
📁 importlib	-	05/09/2024 07:14:10 AM	rwxr-xr-x
📄 imputil.py	25.16 KB	03/08/2023 06:40:28 PM	rw-r--r--
📄 inspect.py	42 KB	03/08/2023 06:40:28 PM	rw-r--r--
📄 io.py	3.24 KB	03/08/2023 06:40:28 PM	rw-r--r--
📁 json	-	05/09/2024 07:14:10 AM	rwxr-xr-x
📄 keyword.py	1.95 KB	03/08/2023 06:40:28 PM	rwxr-xr-x
📁 lib-dynload	-	05/09/2024 07:14:10 AM	rwxr-xr-x
📁 lib-tk	-	05/09/2024 07:14:10 AM	rwxr-xr-x
📁 lib2to3	-	05/09/2024 07:14:10 AM	rwxr-xr-x
📄 linecache.py	3.93 KB	03/08/2023 06:40:28 PM	rw-r--r--
📄 locale.py	100.43 KB	03/08/2023 06:40:28 PM	rw-r--r--
📁 logging	-	05/09/2024 07:14:10 AM	rwxr-xr-x
📄 macpath.py	6.14 KB	03/08/2023 06:40:28 PM	rw-r--r--
📄 macurl2path.py	2.67 KB	03/08/2023 06:40:28 PM	rw-r--r--
📄 mailbox.py	79.34 KB	03/08/2023 06:40:28 PM	rw-r--r--
📄 mailcap.py	8.21 KB	03/08/2023 06:40:28 PM	rw-r--r--
📄 markupbase.py	14.3 KB	03/08/2023 06:40:28 PM	rw-r--r--
📄 md5.py	358 bytes	03/08/2023 06:40:28 PM	rw-r--r--
📄 mhlib.py	32.65 KB	03/08/2023 06:40:28 PM	rw-r--r--
📄 mimetools.py	7 KB	03/08/2023 06:40:28 PM	rw-r--r--
📄 mimetypes.py	20.54 KB	03/08/2023 06:40:28 PM	rw-r--r--
📄 mimify.py	14.67 KB	03/08/2023 06:40:28 PM	rwxr-xr-x
📄 modulefinder.py	23.89 KB	03/08/2023 06:40:28 PM	rw-r--r--
📄 multifile.py	4.71 KB	03/08/2023 06:40:28 PM	rw-r--r--
📁 multiprocessing	-	05/09/2024 07:14:10 AM	rwxr-xr-x
📄 mutex.py	1.83 KB	03/08/2023 06:40:28 PM	rw-r--r--
📄 netrc.py	5.75 KB	03/08/2023 06:40:28 PM	rw-r--r--
📄 new.py	610 bytes	03/08/2023 06:40:28 PM	rw-r--r--
📄 nntplib.py	20.97 KB	03/08/2023 06:40:28 PM	rw-r--r--
📄 ntpath.py	18.97 KB	03/08/2023 06:40:28 PM	rw-r--r--
📄 nturl2path.py	2.36 KB	03/08/2023 06:40:28 PM	rw-r--r--
📄 numbers.py	10.08 KB	03/08/2023 06:40:28 PM	rw-r--r--
📄 opcode.py	5.35 KB	03/08/2023 06:40:28 PM	rw-r--r--
📄 optparse.py	59.77 KB	03/08/2023 06:40:28 PM	rw-r--r--
📄 os.py	25.3 KB	03/08/2023 06:40:28 PM	rw-r--r--
📄 os2emxpath.py	4.53 KB	03/08/2023 06:40:28 PM	rw-r--r--
📄 pdb.doc	7.73 KB	03/08/2023 06:40:28 PM	rw-r--r--
📄 pdb.py	45.02 KB	03/08/2023 06:40:28 PM	rwxr-xr-x
📄 pickle.py	44.42 KB	03/08/2023 06:40:28 PM	rw-r--r--
📄 pickletools.py	72.78 KB	03/08/2023 06:40:28 PM	rw-r--r--
📄 pipes.py	9.36 KB	03/08/2023 06:40:28 PM	rw-r--r--
📄 pkgutil.py	19.77 KB	03/08/2023 06:40:28 PM	rw-r--r--
📁 plat-x86_64-linux-gnu	-	05/09/2024 07:14:10 AM	rwxr-xr-x
📄 platform.py	52.52 KB	03/08/2023 06:40:28 PM	rwxr-xr-x
📄 plistlib.py	14.83 KB	03/08/2023 06:40:28 PM	rw-r--r--
📄 popen2.py	8.22 KB	03/08/2023 06:40:28 PM	rw-r--r--
📄 poplib.py	12.52 KB	03/08/2023 06:40:28 PM	rw-r--r--
📄 posixfile.py	7.82 KB	03/08/2023 06:40:28 PM	rw-r--r--
📄 posixpath.py	13.96 KB	03/08/2023 06:40:28 PM	rw-r--r--
📄 pprint.py	11.5 KB	03/08/2023 06:40:28 PM	rw-r--r--
📄 profile.py	22.25 KB	03/08/2023 06:40:28 PM	rwxr-xr-x
📄 pstats.py	26.09 KB	03/08/2023 06:40:28 PM	rw-r--r--
📄 pty.py	4.94 KB	03/08/2023 06:40:28 PM	rw-r--r--
📄 py_compile.py	6.14 KB	03/08/2023 06:40:28 PM	rw-r--r--
📄 pyclbr.py	13.07 KB	03/08/2023 06:40:28 PM	rw-r--r--
📄 pydoc.py	93.9 KB	03/08/2023 06:40:28 PM	rwxr-xr-x
📁 pydoc_data	-	05/09/2024 07:14:10 AM	rwxr-xr-x
📄 quopri.py	6.8 KB	03/08/2023 06:40:28 PM	rwxr-xr-x
📄 random.py	31.7 KB	03/08/2023 06:40:28 PM	rw-r--r--
📄 re.py	13.11 KB	03/08/2023 06:40:28 PM	rw-r--r--
📄 repr.py	4.2 KB	03/08/2023 06:40:28 PM	rw-r--r--
📄 rexec.py	19.68 KB	03/08/2023 06:40:28 PM	rw-r--r--
📄 rfc822.py	32.76 KB	03/08/2023 06:40:28 PM	rw-r--r--
📄 rlcompleter.py	5.85 KB	03/08/2023 06:40:28 PM	rw-r--r--
📄 robotparser.py	7.51 KB	03/08/2023 06:40:28 PM	rw-r--r--
📄 runpy.py	10.82 KB	03/08/2023 06:40:28 PM	rw-r--r--
📄 sched.py	4.97 KB	03/08/2023 06:40:28 PM	rw-r--r--
📄 sets.py	18.6 KB	03/08/2023 06:40:28 PM	rw-r--r--
📄 sgmllib.py	17.46 KB	03/08/2023 06:40:28 PM	rw-r--r--
📄 sha.py	393 bytes	03/08/2023 06:40:28 PM	rw-r--r--
📄 shelve.py	7.99 KB	03/08/2023 06:40:28 PM	rw-r--r--
📄 shlex.py	10.9 KB	03/08/2023 06:40:28 PM	rw-r--r--
📄 shutil.py	19.41 KB	03/08/2023 06:40:28 PM	rw-r--r--
📄 site.py	19.48 KB	03/08/2023 06:40:28 PM	rw-r--r--
📄 sitecustomize.py	155 bytes	11/07/2019 10:07:09 AM	rw-r--r--
📄 smtpd.py	18.11 KB	03/08/2023 06:40:28 PM	rwxr-xr-x
📄 smtplib.py	31.38 KB	03/08/2023 06:40:28 PM	rwxr-xr-x
📄 sndhdr.py	5.83 KB	03/08/2023 06:40:28 PM	rw-r--r--
📄 socket.py	20.13 KB	03/08/2023 06:40:28 PM	rw-r--r--
📁 sqlite3	-	05/09/2024 07:14:10 AM	rwxr-xr-x
📄 sre.py	384 bytes	03/08/2023 06:40:28 PM	rw-r--r--
📄 sre_compile.py	19.36 KB	03/08/2023 06:40:28 PM	rw-r--r--
📄 sre_constants.py	7.03 KB	03/08/2023 06:40:28 PM	rw-r--r--
📄 sre_parse.py	29.98 KB	03/08/2023 06:40:28 PM	rw-r--r--
📄 ssl.py	36.58 KB	03/08/2023 06:40:28 PM	rw-r--r--
📄 stat.py	1.8 KB	03/08/2023 06:40:28 PM	rw-r--r--
📄 statvfs.py	898 bytes	03/08/2023 06:40:28 PM	rw-r--r--
📄 string.py	21.04 KB	03/08/2023 06:40:28 PM	rw-r--r--
📄 stringold.py	12.16 KB	03/08/2023 06:40:28 PM	rw-r--r--
📄 stringprep.py	13.21 KB	03/08/2023 06:40:28 PM	rw-r--r--
📄 struct.py	82 bytes	03/08/2023 06:40:28 PM	rw-r--r--
📄 subprocess.py	49.34 KB	03/08/2023 06:40:28 PM	rw-r--r--
📄 sunau.py	16.82 KB	03/08/2023 06:40:28 PM	rw-r--r--
📄 sunaudio.py	1.37 KB	03/08/2023 06:40:28 PM	rw-r--r--
📄 symbol.py	2.01 KB	03/08/2023 06:40:28 PM	rwxr-xr-x
📄 symtable.py	7.26 KB	03/08/2023 06:40:28 PM	rw-r--r--
📄 sysconfig.py	24.9 KB	03/08/2023 06:40:28 PM	rw-r--r--
📄 tabnanny.py	11.07 KB	03/08/2023 06:40:28 PM	rwxr-xr-x
📄 tarfile.py	88.53 KB	03/08/2023 06:40:28 PM	rw-r--r--
📄 telnetlib.py	26.4 KB	03/08/2023 06:40:28 PM	rw-r--r--
📄 tempfile.py	19.09 KB	03/08/2023 06:40:28 PM	rw-r--r--
📁 test	-	05/09/2024 07:14:10 AM	rwxr-xr-x
📄 textwrap.py	16.88 KB	03/08/2023 06:40:28 PM	rw-r--r--
📄 this.py	1002 bytes	03/08/2023 06:40:28 PM	rw-r--r--
📄 threading.py	46.01 KB	03/08/2023 06:40:28 PM	rw-r--r--
📄 timeit.py	12.49 KB	03/08/2023 06:40:28 PM	rwxr-xr-x
📄 toaiff.py	3.07 KB	03/08/2023 06:40:28 PM	rw-r--r--
📄 token.py	2.85 KB	03/08/2023 06:40:28 PM	rw-r--r--
📄 tokenize.py	17.07 KB	03/08/2023 06:40:28 PM	rw-r--r--
📄 trace.py	29.19 KB	03/08/2023 06:40:28 PM	rwxr-xr-x
📄 traceback.py	11.02 KB	03/08/2023 06:40:28 PM	rw-r--r--
📄 tty.py	879 bytes	03/08/2023 06:40:28 PM	rw-r--r--
📄 types.py	2.04 KB	03/08/2023 06:40:28 PM	rw-r--r--
📁 unittest	-	05/09/2024 07:14:10 AM	rwxr-xr-x
📄 urllib.py	58.68 KB	03/08/2023 06:40:28 PM	rw-r--r--
📄 urllib2.py	51.57 KB	03/08/2023 06:40:28 PM	rw-r--r--
📄 urlparse.py	16.78 KB	03/08/2023 06:40:28 PM	rw-r--r--
📄 user.py	1.59 KB	03/08/2023 06:40:28 PM	rw-r--r--
📄 uu.py	6.4 KB	03/08/2023 06:40:28 PM	rwxr-xr-x
📄 uuid.py	22.63 KB	03/08/2023 06:40:28 PM	rw-r--r--
📄 warnings.py	14.48 KB	03/08/2023 06:40:28 PM	rw-r--r--
📄 wave.py	18.15 KB	03/08/2023 06:40:28 PM	rw-r--r--
📄 weakref.py	14.48 KB	03/08/2023 06:40:28 PM	rw-r--r--
📄 webbrowser.py	22.19 KB	03/08/2023 06:40:28 PM	rwxr-xr-x
📄 whichdb.py	3.3 KB	03/08/2023 06:40:28 PM	rw-r--r--
📁 wsgiref	-	05/09/2024 07:14:10 AM	rwxr-xr-x
📄 wsgiref.egg-info	187 bytes	03/08/2023 06:40:28 PM	rw-r--r--
📄 xdrlib.py	5.93 KB	03/08/2023 06:40:28 PM	rw-r--r--
📁 xml	-	05/09/2024 07:14:10 AM	rwxr-xr-x
📄 xmllib.py	34.05 KB	03/08/2023 06:40:28 PM	rw-r--r--
📄 xmlrpclib.py	50.91 KB	03/08/2023 06:40:28 PM	rw-r--r--
📄 zipfile.py	58.08 KB	03/08/2023 06:40:28 PM	rw-r--r--

Editing: abc.py

# Copyright 2007 Google, Inc. All Rights Reserved.
# Licensed to PSF under a Contributor Agreement.

"""Abstract Base Classes (ABCs) according to PEP 3119."""

import types

from _weakrefset import WeakSet

# Instance of old-style class
class _C: pass
_InstanceType = type(_C())

def abstractmethod(funcobj):
    """A decorator indicating abstract methods.

Requires that the metaclass is ABCMeta or derived from it.  A
    class that has a metaclass derived from ABCMeta cannot be
    instantiated unless all of its abstract methods are overridden.
    The abstract methods can be called using any of the normal
    'super' call mechanisms.

Usage:

class C:
            __metaclass__ = ABCMeta
            @abstractmethod
            def my_abstract_method(self, ...):
                ...
    """
    funcobj.__isabstractmethod__ = True
    return funcobj

class abstractproperty(property):
    """A decorator indicating abstract properties.

Requires that the metaclass is ABCMeta or derived from it.  A
    class that has a metaclass derived from ABCMeta cannot be
    instantiated unless all of its abstract properties are overridden.
    The abstract properties can be called using any of the normal
    'super' call mechanisms.

Usage:

class C:
            __metaclass__ = ABCMeta
            @abstractproperty
            def my_abstract_property(self):
                ...

This defines a read-only property; you can also define a read-write
    abstract property using the 'long' form of property declaration:

class C:
            __metaclass__ = ABCMeta
            def getx(self): ...
            def setx(self, value): ...
            x = abstractproperty(getx, setx)
    """
    __isabstractmethod__ = True

class ABCMeta(type):

"""Metaclass for defining Abstract Base Classes (ABCs).

Use this metaclass to create an ABC.  An ABC can be subclassed
    directly, and then acts as a mix-in class.  You can also register
    unrelated concrete classes (even built-in classes) and unrelated
    ABCs as 'virtual subclasses' -- these and their descendants will
    be considered subclasses of the registering ABC by the built-in
    issubclass() function, but the registering ABC won't show up in
    their MRO (Method Resolution Order) nor will method
    implementations defined by the registering ABC be callable (not
    even via super()).

"""

# A global counter that is incremented each time a class is
    # registered as a virtual subclass of anything.  It forces the
    # negative cache to be cleared before its next use.
    _abc_invalidation_counter = 0

def __new__(mcls, name, bases, namespace):
        cls = super(ABCMeta, mcls).__new__(mcls, name, bases, namespace)
        # Compute set of abstract method names
        abstracts = set(name
                     for name, value in namespace.items()
                     if getattr(value, "__isabstractmethod__", False))
        for base in bases:
            for name in getattr(base, "__abstractmethods__", set()):
                value = getattr(cls, name, None)
                if getattr(value, "__isabstractmethod__", False):
                    abstracts.add(name)
        cls.__abstractmethods__ = frozenset(abstracts)
        # Set up inheritance registry
        cls._abc_registry = WeakSet()
        cls._abc_cache = WeakSet()
        cls._abc_negative_cache = WeakSet()
        cls._abc_negative_cache_version = ABCMeta._abc_invalidation_counter
        return cls

def register(cls, subclass):
        """Register a virtual subclass of an ABC."""
        if not isinstance(subclass, (type, types.ClassType)):
            raise TypeError("Can only register classes")
        if issubclass(subclass, cls):
            return  # Already a subclass
        # Subtle: test for cycles *after* testing for "already a subclass";
        # this means we allow X.register(X) and interpret it as a no-op.
        if issubclass(cls, subclass):
            # This would create a cycle, which is bad for the algorithm below
            raise RuntimeError("Refusing to create an inheritance cycle")
        cls._abc_registry.add(subclass)
        ABCMeta._abc_invalidation_counter += 1  # Invalidate negative cache

def _dump_registry(cls, file=None):
        """Debug helper to print the ABC registry."""
        print >> file, "Class: %s.%s" % (cls.__module__, cls.__name__)
        print >> file, "Inv.counter: %s" % ABCMeta._abc_invalidation_counter
        for name in sorted(cls.__dict__.keys()):
            if name.startswith("_abc_"):
                value = getattr(cls, name)
                print >> file, "%s: %r" % (name, value)

def __instancecheck__(cls, instance):
        """Override for isinstance(instance, cls)."""
        # Inline the cache checking when it's simple.
        subclass = getattr(instance, '__class__', None)
        if subclass is not None and subclass in cls._abc_cache:
            return True
        subtype = type(instance)
        # Old-style instances
        if subtype is _InstanceType:
            subtype = subclass
        if subtype is subclass or subclass is None:
            if (cls._abc_negative_cache_version ==
                ABCMeta._abc_invalidation_counter and
                subtype in cls._abc_negative_cache):
                return False
            # Fall back to the subclass check.
            return cls.__subclasscheck__(subtype)
        return (cls.__subclasscheck__(subclass) or
                cls.__subclasscheck__(subtype))

def __subclasscheck__(cls, subclass):
        """Override for issubclass(subclass, cls)."""
        # Check cache
        if subclass in cls._abc_cache:
            return True
        # Check negative cache; may have to invalidate
        if cls._abc_negative_cache_version < ABCMeta._abc_invalidation_counter:
            # Invalidate the negative cache
            cls._abc_negative_cache = WeakSet()
            cls._abc_negative_cache_version = ABCMeta._abc_invalidation_counter
        elif subclass in cls._abc_negative_cache:
            return False
        # Check the subclass hook
        ok = cls.__subclasshook__(subclass)
        if ok is not NotImplemented:
            assert isinstance(ok, bool)
            if ok:
                cls._abc_cache.add(subclass)
            else:
                cls._abc_negative_cache.add(subclass)
            return ok
        # Check if it's a direct subclass
        if cls in getattr(subclass, '__mro__', ()):
            cls._abc_cache.add(subclass)
            return True
        # Check if it's a subclass of a registered class (recursive)
        for rcls in cls._abc_registry:
            if issubclass(subclass, rcls):
                cls._abc_cache.add(subclass)
                return True
        # Check if it's a subclass of a subclass (recursive)
        for scls in cls.__subclasses__():
            if issubclass(subclass, scls):
                cls._abc_cache.add(subclass)
                return True
        # No dice; update negative cache
        cls._abc_negative_cache.add(subclass)
        return False