golden hour

/usr/lib64/python2.7

File/Folder	Size	Actions
BaseHTTPServer.py	21.93 KB
BaseHTTPServer.pyc	21.18 KB
BaseHTTPServer.pyo	21.18 KB
Bastion.py	5.61 KB
Bastion.pyc	6.5 KB
Bastion.pyo	6.5 KB
CGIHTTPServer.py	12.84 KB
CGIHTTPServer.pyc	10.84 KB
CGIHTTPServer.pyo	10.84 KB
ConfigParser.py	27.1 KB
ConfigParser.pyc	24.62 KB
ConfigParser.pyo	24.62 KB
Cookie.py	24.66 KB
Cookie.pyc	21.64 KB
Cookie.pyo	21.64 KB
Demo	-
Doc	-
DocXMLRPCServer.py	10.52 KB
DocXMLRPCServer.pyc	9.96 KB
DocXMLRPCServer.pyo	9.85 KB
HTMLParser.py	16.58 KB
HTMLParser.pyc	13.39 KB
HTMLParser.pyo	13.1 KB
MimeWriter.py	6.33 KB
MimeWriter.pyc	7.19 KB
MimeWriter.pyo	7.19 KB
Queue.py	8.36 KB
Queue.pyc	9.19 KB
Queue.pyo	9.19 KB
SimpleHTTPServer.py	7.25 KB
SimpleHTTPServer.pyc	7.55 KB
SimpleHTTPServer.pyo	7.55 KB
SimpleXMLRPCServer.py	25.17 KB
SimpleXMLRPCServer.pyc	22.31 KB
SimpleXMLRPCServer.pyo	22.31 KB
SocketServer.py	23.29 KB
SocketServer.pyc	23.49 KB
SocketServer.pyo	23.49 KB
StringIO.py	10.41 KB
StringIO.pyc	11.21 KB
StringIO.pyo	11.21 KB
Tools	-
UserDict.py	5.67 KB
UserDict.pyc	8.61 KB
UserDict.pyo	8.61 KB
UserList.py	3.56 KB
UserList.pyc	6.42 KB
UserList.pyo	6.42 KB
UserString.py	9.46 KB
UserString.pyc	14.52 KB
UserString.pyo	14.52 KB
_LWPCookieJar.py	6.4 KB
_LWPCookieJar.pyc	5.4 KB
_LWPCookieJar.pyo	5.4 KB
_MozillaCookieJar.py	5.67 KB
_MozillaCookieJar.pyc	4.37 KB
_MozillaCookieJar.pyo	4.33 KB
__future__.py	4.28 KB
__future__.pyc	4.13 KB
__future__.pyo	4.13 KB
__phello__.foo.py	64 B
__phello__.foo.pyc	125 B
__phello__.foo.pyo	125 B
_abcoll.py	17.45 KB
_abcoll.pyc	24.4 KB
_abcoll.pyo	24.4 KB
_osx_support.py	18.03 KB
_osx_support.pyc	11.28 KB
_osx_support.pyo	11.28 KB
_pyio.py	67.24 KB
_pyio.pyc	62.71 KB
_pyio.pyo	62.71 KB
_strptime.py	19.75 KB
_strptime.pyc	14.53 KB
_strptime.pyo	14.53 KB
_sysconfigdata.py	17.56 KB
_sysconfigdata.pyc	20.72 KB
_sysconfigdata.pyo	20.72 KB
_threading_local.py	7.28 KB
_threading_local.pyc	6.45 KB
_threading_local.pyo	6.45 KB
_weakrefset.py	5.48 KB
_weakrefset.pyc	9.25 KB
_weakrefset.pyo	9.25 KB
abc.py	6.98 KB
abc.pyc	6 KB
abc.pyo	5.94 KB
aifc.py	32.94 KB
aifc.pyc	29.31 KB
aifc.pyo	29.31 KB
antigravity.py	60 B
antigravity.pyc	203 B
antigravity.pyo	203 B
anydbm.py	2.6 KB
anydbm.pyc	2.73 KB
anydbm.pyo	2.73 KB
argparse.py	86.46 KB
argparse.pyc	62.57 KB
argparse.pyo	62.41 KB
ast.py	11.53 KB
ast.pyc	12.65 KB
ast.pyo	12.65 KB
asynchat.py	11.13 KB
asynchat.pyc	8.44 KB
asynchat.pyo	8.44 KB
asyncore.py	20.36 KB
asyncore.pyc	18.4 KB
asyncore.pyo	18.4 KB
atexit.py	1.67 KB
atexit.pyc	2.15 KB
atexit.pyo	2.15 KB
audiodev.py	7.42 KB
audiodev.pyc	8.27 KB
audiodev.pyo	8.27 KB
base64.py	11.09 KB
base64.pyc	10.63 KB
base64.pyo	10.63 KB
bdb.py	21.21 KB
bdb.pyc	18.65 KB
bdb.pyo	18.65 KB
binhex.py	14.14 KB
binhex.pyc	15.04 KB
binhex.pyo	15.04 KB
bisect.py	2.53 KB
bisect.pyc	3 KB
bisect.pyo	3 KB
bsddb	-
cProfile.py	6.43 KB
cProfile.pyc	6.25 KB
cProfile.pyo	6.25 KB
calendar.py	22.76 KB
calendar.pyc	27.13 KB
calendar.pyo	27.13 KB
cgi.py	34.31 KB
cgi.pyc	31.99 KB
cgi.pyo	31.99 KB
cgitb.py	11.89 KB
cgitb.pyc	11.9 KB
cgitb.pyo	11.9 KB
chunk.py	5.25 KB
chunk.pyc	5.46 KB
chunk.pyo	5.46 KB
cmd.py	14.67 KB
cmd.pyc	13.71 KB
cmd.pyo	13.71 KB
code.py	9.95 KB
code.pyc	10.09 KB
code.pyo	10.09 KB
codecs.py	34.44 KB
codecs.pyc	35.74 KB
codecs.pyo	35.74 KB
codeop.py	5.86 KB
codeop.pyc	6.44 KB
codeop.pyo	6.44 KB
collections.py	25.28 KB
collections.pyc	23.99 KB
collections.pyo	23.94 KB
colorsys.py	3.6 KB
colorsys.pyc	3.9 KB
colorsys.pyo	3.9 KB
commands.py	2.49 KB
commands.pyc	2.41 KB
commands.pyo	2.41 KB
compileall.py	7.58 KB
compileall.pyc	6.85 KB
compileall.pyo	6.85 KB
compiler	-
config	-
contextlib.py	4.32 KB
contextlib.pyc	4.35 KB
contextlib.pyo	4.35 KB
cookielib.py	63.21 KB
cookielib.pyc	53.55 KB
cookielib.pyo	53.37 KB
copy.py	11.25 KB
copy.pyc	11.91 KB
copy.pyo	11.82 KB
copy_reg.py	6.64 KB
copy_reg.pyc	4.99 KB
copy_reg.pyo	4.95 KB
crypt.py	2.24 KB
crypt.pyc	2.89 KB
crypt.pyo	2.89 KB
csv.py	15.96 KB
csv.pyc	13.14 KB
csv.pyo	13.14 KB
ctypes	-
curses	-
dbhash.py	498 B
dbhash.pyc	718 B
dbhash.pyo	718 B
decimal.py	215.84 KB
decimal.pyc	167.33 KB
decimal.pyo	167.33 KB
difflib.py	80.42 KB
difflib.pyc	60.5 KB
difflib.pyo	60.45 KB
dircache.py	1.1 KB
dircache.pyc	1.54 KB
dircache.pyo	1.54 KB
dis.py	6.35 KB
dis.pyc	6.08 KB
dis.pyo	6.08 KB
distutils	-
doctest.py	102.01 KB
doctest.pyc	81.45 KB
doctest.pyo	81.17 KB
dumbdbm.py	8.61 KB
dumbdbm.pyc	6.41 KB
dumbdbm.pyo	6.41 KB
dummy_thread.py	4.31 KB
dummy_thread.pyc	5.27 KB
dummy_thread.pyo	5.27 KB
dummy_threading.py	2.74 KB
dummy_threading.pyc	1.25 KB
dummy_threading.pyo	1.25 KB
email	-
encodings	-
filecmp.py	9.36 KB
filecmp.pyc	9.4 KB
filecmp.pyo	9.4 KB
fileinput.py	13.81 KB
fileinput.pyc	14.48 KB
fileinput.pyo	14.48 KB
fnmatch.py	3.16 KB
fnmatch.pyc	3.45 KB
fnmatch.pyo	3.45 KB
formatter.py	14.56 KB
formatter.pyc	18.73 KB
formatter.pyo	18.73 KB
fpformat.py	4.59 KB
fpformat.pyc	4.56 KB
fpformat.pyo	4.56 KB
fractions.py	21.87 KB
fractions.pyc	19.27 KB
fractions.pyo	19.27 KB
ftplib.py	36.1 KB
ftplib.pyc	33.38 KB
ftplib.pyo	33.38 KB
functools.py	4.37 KB
functools.pyc	5.95 KB
functools.pyo	5.95 KB
genericpath.py	2.94 KB
genericpath.pyc	3.19 KB
genericpath.pyo	3.19 KB
getopt.py	7.15 KB
getopt.pyc	6.5 KB
getopt.pyo	6.45 KB
getpass.py	5.43 KB
getpass.pyc	4.63 KB
getpass.pyo	4.63 KB
gettext.py	19.47 KB
gettext.pyc	15.19 KB
gettext.pyo	15.19 KB
glob.py	2.86 KB
glob.pyc	2.83 KB
glob.pyo	2.83 KB
gzip.py	18.26 KB
gzip.pyc	14.72 KB
gzip.pyo	14.72 KB
hashlib.py	7.48 KB
hashlib.pyc	6.74 KB
hashlib.pyo	6.74 KB
heapq.py	17.76 KB
heapq.pyc	14.13 KB
heapq.pyo	14.13 KB
hmac.py	4.48 KB
hmac.pyc	4.44 KB
hmac.pyo	4.44 KB
hotshot	-
htmlentitydefs.py	17.63 KB
htmlentitydefs.pyc	6.22 KB
htmlentitydefs.pyo	6.22 KB
htmllib.py	12.57 KB
htmllib.pyc	19.83 KB
htmllib.pyo	19.83 KB
httplib.py	51.37 KB
httplib.pyc	37.54 KB
httplib.pyo	37.37 KB
idlelib	-
ihooks.py	18.54 KB
ihooks.pyc	20.87 KB
ihooks.pyo	20.87 KB
imaplib.py	47.34 KB
imaplib.pyc	44.45 KB
imaplib.pyo	41.8 KB
imghdr.py	3.46 KB
imghdr.pyc	4.73 KB
imghdr.pyo	4.73 KB
importlib	-
imputil.py	25.16 KB
imputil.pyc	15.26 KB
imputil.pyo	15.08 KB
inspect.py	41.47 KB
inspect.pyc	39.04 KB
inspect.pyo	39.04 KB
io.py	3.12 KB
io.pyc	3.4 KB
io.pyo	3.4 KB
json	-
keyword.py	1.95 KB
keyword.pyc	2.06 KB
keyword.pyo	2.06 KB
lib-dynload	-
lib-tk	-
lib2to3	-
linecache.py	3.87 KB
linecache.pyc	3.14 KB
linecache.pyo	3.14 KB
locale.py	87.33 KB
locale.pyc	48.77 KB
locale.pyo	48.77 KB
logging	-
macpath.py	6.11 KB
macpath.pyc	7.47 KB
macpath.pyo	7.47 KB
macurl2path.py	3.2 KB
macurl2path.pyc	2.71 KB
macurl2path.pyo	2.71 KB
mailbox.py	78.86 KB
mailbox.pyc	74.87 KB
mailbox.pyo	74.82 KB
mailcap.py	8.2 KB
mailcap.pyc	7.77 KB
mailcap.pyo	7.77 KB
markupbase.py	14.3 KB
markupbase.pyc	9.08 KB
markupbase.pyo	8.89 KB
md5.py	358 B
md5.pyc	378 B
md5.pyo	378 B
mhlib.py	32.65 KB
mhlib.pyc	33.01 KB
mhlib.pyo	33.01 KB
mimetools.py	7 KB
mimetools.pyc	8.03 KB
mimetools.pyo	8.03 KB
mimetypes.py	20.22 KB
mimetypes.pyc	17.86 KB
mimetypes.pyo	17.86 KB
mimify.py	14.67 KB
mimify.pyc	11.71 KB
mimify.pyo	11.71 KB
modulefinder.py	23.71 KB
modulefinder.pyc	18.27 KB
modulefinder.pyo	18.19 KB
multifile.py	4.71 KB
multifile.pyc	5.29 KB
multifile.pyo	5.25 KB
multiprocessing	-
mutex.py	1.83 KB
mutex.pyc	2.46 KB
mutex.pyo	2.46 KB
netrc.py	4.47 KB
netrc.pyc	3.83 KB
netrc.pyo	3.83 KB
new.py	610 B
new.pyc	862 B
new.pyo	862 B
nntplib.py	20.97 KB
nntplib.pyc	20.55 KB
nntplib.pyo	20.55 KB
ntpath.py	18.02 KB
ntpath.pyc	11.6 KB
ntpath.pyo	11.56 KB
nturl2path.py	2.32 KB
nturl2path.pyc	1.77 KB
nturl2path.pyo	1.77 KB
numbers.py	10.08 KB
numbers.pyc	13.68 KB
numbers.pyo	13.68 KB
opcode.py	5.35 KB
opcode.pyc	6 KB
opcode.pyo	6 KB
optparse.py	59.69 KB
optparse.pyc	52.78 KB
optparse.pyo	52.7 KB
os.py	25.17 KB
os.pyc	24.96 KB
os.pyo	24.96 KB
os2emxpath.py	4.5 KB
os2emxpath.pyc	4.39 KB
os2emxpath.pyo	4.39 KB
pdb.doc	7.73 KB
pdb.py	44.94 KB
pdb.pyc	42.59 KB
pdb.pyo	42.59 KB
pickle.py	44.09 KB
pickle.pyc	37.56 KB
pickle.pyo	37.37 KB
pickletools.py	72.79 KB
pickletools.pyc	55.77 KB
pickletools.pyo	54.95 KB
pipes.py	9.36 KB
pipes.pyc	9.09 KB
pipes.pyo	9.09 KB
pkgutil.py	19.87 KB
pkgutil.pyc	18.49 KB
pkgutil.pyo	18.49 KB
plat-linux2	-
platform.py	51.98 KB
platform.pyc	36.06 KB
platform.pyo	36.06 KB
plistlib.py	15.44 KB
plistlib.pyc	19.52 KB
plistlib.pyo	19.44 KB
popen2.py	8.22 KB
popen2.pyc	8.81 KB
popen2.pyo	8.77 KB
poplib.py	12.64 KB
poplib.pyc	13.16 KB
poplib.pyo	13.16 KB
posixfile.py	7.82 KB
posixfile.pyc	7.47 KB
posixfile.pyo	7.47 KB
posixpath.py	13.27 KB
posixpath.pyc	11.03 KB
posixpath.pyo	11.03 KB
pprint.py	11.73 KB
pprint.pyc	10.06 KB
pprint.pyo	9.89 KB
profile.py	22.25 KB
profile.pyc	16.07 KB
profile.pyo	15.83 KB
pstats.py	26.08 KB
pstats.pyc	24.43 KB
pstats.pyo	24.43 KB
pty.py	4.94 KB
pty.pyc	4.85 KB
pty.pyo	4.85 KB
py_compile.py	5.79 KB
py_compile.pyc	6.27 KB
py_compile.pyo	6.27 KB
pyclbr.py	13.07 KB
pyclbr.pyc	9.42 KB
pyclbr.pyo	9.42 KB
pydoc.py	91.12 KB
pydoc.pyc	88.35 KB
pydoc.pyo	88.29 KB
pydoc_data	-
quopri.py	6.81 KB
quopri.pyc	6.42 KB
quopri.pyo	6.42 KB
random.py	31.45 KB
random.pyc	24.99 KB
random.pyo	24.99 KB
re.py	12.66 KB
re.pyc	12.79 KB
re.pyo	12.79 KB
repr.py	4.2 KB
repr.pyc	5.26 KB
repr.pyo	5.26 KB
rexec.py	19.68 KB
rexec.pyc	23.58 KB
rexec.pyo	23.58 KB
rfc822.py	32.51 KB
rfc822.pyc	31.05 KB
rfc822.pyo	31.05 KB
rlcompleter.py	5.68 KB
rlcompleter.pyc	5.84 KB
rlcompleter.pyo	5.84 KB
robotparser.py	7.03 KB
robotparser.pyc	7.7 KB
robotparser.pyo	7.7 KB
runpy.py	10.45 KB
runpy.pyc	8.21 KB
runpy.pyo	8.21 KB
sched.py	4.97 KB
sched.pyc	4.88 KB
sched.pyo	4.88 KB
sets.py	18.6 KB
sets.pyc	16.5 KB
sets.pyo	16.5 KB
sgmllib.py	17.46 KB
sgmllib.pyc	15.07 KB
sgmllib.pyo	15.07 KB
sha.py	393 B
sha.pyc	421 B
sha.pyo	421 B
shelve.py	7.89 KB
shelve.pyc	10.03 KB
shelve.pyo	10.03 KB
shlex.py	10.88 KB
shlex.pyc	7.37 KB
shlex.pyo	7.37 KB
shutil.py	18.46 KB
shutil.pyc	18.1 KB
shutil.pyo	18.1 KB
site-packages	-
site.py	19.61 KB
site.pyc	19.11 KB
site.pyo	19.11 KB
smtpd.py	18.11 KB
smtpd.pyc	15.52 KB
smtpd.pyo	15.52 KB
smtplib.py	30.9 KB
smtplib.pyc	29.29 KB
smtplib.pyo	29.29 KB
sndhdr.py	5.83 KB
sndhdr.pyc	7.18 KB
sndhdr.pyo	7.18 KB
socket.py	20.03 KB
socket.pyc	15.73 KB
socket.pyo	15.64 KB
sqlite3	-
sre.py	384 B
sre.pyc	519 B
sre.pyo	519 B
sre_compile.py	15.99 KB
sre_compile.pyc	10.76 KB
sre_compile.pyo	10.65 KB
sre_constants.py	6.95 KB
sre_constants.pyc	5.97 KB
sre_constants.pyo	5.97 KB
sre_parse.py	26.84 KB
sre_parse.pyc	18.98 KB
sre_parse.pyo	18.98 KB
ssl.py	38.7 KB
ssl.pyc	32.05 KB
ssl.pyo	32.05 KB
stat.py	1.8 KB
stat.pyc	2.69 KB
stat.pyo	2.69 KB
statvfs.py	898 B
statvfs.pyc	620 B
statvfs.pyo	620 B
string.py	20.27 KB
string.pyc	19.54 KB
string.pyo	19.54 KB
stringold.py	12.16 KB
stringold.pyc	12.25 KB
stringold.pyo	12.25 KB
stringprep.py	13.21 KB
stringprep.pyc	14.15 KB
stringprep.pyo	14.08 KB
struct.py	82 B
struct.pyc	239 B
struct.pyo	239 B
subprocess.py	57.68 KB
subprocess.pyc	40.93 KB
subprocess.pyo	40.93 KB
sunau.py	16.15 KB
sunau.pyc	17.53 KB
sunau.pyo	17.53 KB
sunaudio.py	1.37 KB
sunaudio.pyc	1.94 KB
sunaudio.pyo	1.94 KB
symbol.py	2.01 KB
symbol.pyc	2.96 KB
symbol.pyo	2.96 KB
symtable.py	7.34 KB
symtable.pyc	11.59 KB
symtable.pyo	11.46 KB
sysconfig.py	21.88 KB
sysconfig.pyc	17.23 KB
sysconfig.pyo	17.23 KB
tabnanny.py	11.07 KB
tabnanny.pyc	8.05 KB
tabnanny.pyo	8.05 KB
tarfile.py	88.12 KB
tarfile.pyc	73.84 KB
tarfile.pyo	73.84 KB
telnetlib.py	26.18 KB
telnetlib.pyc	22.53 KB
telnetlib.pyo	22.53 KB
tempfile.py	17.91 KB
tempfile.pyc	19.35 KB
tempfile.pyo	19.35 KB
test	-
textwrap.py	16.64 KB
textwrap.pyc	11.62 KB
textwrap.pyo	11.53 KB
this.py	1002 B
this.pyc	1.19 KB
this.pyo	1.19 KB
threading.py	46.28 KB
threading.pyc	41.7 KB
threading.pyo	39.58 KB
timeit.py	11.82 KB
timeit.pyc	11.5 KB
timeit.pyo	11.5 KB
toaiff.py	3.07 KB
toaiff.pyc	3.03 KB
toaiff.pyo	3.03 KB
token.py	2.88 KB
token.pyc	3.73 KB
token.pyo	3.73 KB
tokenize.py	16.15 KB
tokenize.pyc	13.61 KB
tokenize.pyo	13.52 KB
trace.py	29.19 KB
trace.pyc	22.26 KB
trace.pyo	22.2 KB
traceback.py	10.99 KB
traceback.pyc	11.35 KB
traceback.pyo	11.35 KB
tty.py	879 B
tty.pyc	1.29 KB
tty.pyo	1.29 KB
types.py	1.99 KB
types.pyc	2.45 KB
types.pyo	2.45 KB
unittest	-
urllib.py	57.14 KB
urllib.pyc	49.1 KB
urllib.pyo	49 KB
urllib2.py	52.13 KB
urllib2.pyc	46.61 KB
urllib2.pyo	46.52 KB
urlparse.py	16.82 KB
urlparse.pyc	15.67 KB
urlparse.pyo	15.67 KB
user.py	1.59 KB
user.pyc	1.68 KB
user.pyo	1.68 KB
uu.py	6.4 KB
uu.pyc	4.21 KB
uu.pyo	4.21 KB
uuid.py	20.6 KB
uuid.pyc	20.68 KB
uuid.pyo	20.68 KB
warnings.py	13.71 KB
warnings.pyc	12.84 KB
warnings.pyo	12.02 KB
wave.py	17.67 KB
wave.pyc	19 KB
wave.pyo	18.94 KB
weakref.py	10.44 KB
weakref.pyc	13.72 KB
weakref.pyo	13.72 KB
webbrowser.py	22.68 KB
webbrowser.pyc	19.83 KB
webbrowser.pyo	19.78 KB
whichdb.py	3.3 KB
whichdb.pyc	2.19 KB
whichdb.pyo	2.19 KB
wsgiref	-
wsgiref.egg-info	187 B
xdrlib.py	5.43 KB
xdrlib.pyc	9.07 KB
xdrlib.pyo	9.07 KB
xml	-
xmllib.py	34.05 KB
xmllib.pyc	26.22 KB
xmllib.pyo	26.22 KB
xmlrpclib.py	50.78 KB
xmlrpclib.pyc	42.89 KB
xmlrpclib.pyo	42.71 KB
zipfile.py	56.45 KB
zipfile.pyc	40.33 KB
zipfile.pyo	40.33 KB

Edit: sets.py

"""Classes to represent arbitrary sets (including sets of sets).

This module implements sets using dictionaries whose values are
ignored.  The usual operations (union, intersection, deletion, etc.)
are provided as both methods and operators.

Important: sets are not sequences!  While they support 'x in s',
'len(s)', and 'for x in s', none of those operations are unique for
sequences; for example, mappings support all three as well.  The
characteristic operation for sequences is subscripting with small
integers: s[i], for i in range(len(s)).  Sets don't support
subscripting at all.  Also, sequences allow multiple occurrences and
their elements have a definite order; sets on the other hand don't
record multiple occurrences and don't remember the order of element
insertion (which is why they don't support s[i]).

The following classes are provided:

BaseSet -- All the operations common to both mutable and immutable
    sets. This is an abstract class, not meant to be directly
    instantiated.

Set -- Mutable sets, subclass of BaseSet; not hashable.

ImmutableSet -- Immutable sets, subclass of BaseSet; hashable.
    An iterable argument is mandatory to create an ImmutableSet.

_TemporarilyImmutableSet -- A wrapper around a Set, hashable,
    giving the same hash value as the immutable set equivalent
    would have.  Do not use this class directly.

Only hashable objects can be added to a Set. In particular, you cannot
really add a Set as an element to another Set; if you try, what is
actually added is an ImmutableSet built from it (it compares equal to
the one you tried adding).

When you ask if `x in y' where x is a Set and y is a Set or
ImmutableSet, x is wrapped into a _TemporarilyImmutableSet z, and
what's tested is actually `z in y'.

"""

# Code history:
#
# - Greg V. Wilson wrote the first version, using a different approach
#   to the mutable/immutable problem, and inheriting from dict.
#
# - Alex Martelli modified Greg's version to implement the current
#   Set/ImmutableSet approach, and make the data an attribute.
#
# - Guido van Rossum rewrote much of the code, made some API changes,
#   and cleaned up the docstrings.
#
# - Raymond Hettinger added a number of speedups and other
#   improvements.

from itertools import ifilter, ifilterfalse

__all__ = ['BaseSet', 'Set', 'ImmutableSet']

import warnings
warnings.warn("the sets module is deprecated", DeprecationWarning,
                stacklevel=2)

class BaseSet(object):
    """Common base class for mutable and immutable sets."""

__slots__ = ['_data']

# Constructor

def __init__(self):
        """This is an abstract class."""
        # Don't call this from a concrete subclass!
        if self.__class__ is BaseSet:
            raise TypeError, ("BaseSet is an abstract class.  "
                              "Use Set or ImmutableSet.")

# Standard protocols: __len__, __repr__, __str__, __iter__

def __len__(self):
        """Return the number of elements of a set."""
        return len(self._data)

def __repr__(self):
        """Return string representation of a set.

This looks like 'Set([<list of elements>])'.
        """
        return self._repr()

# __str__ is the same as __repr__
    __str__ = __repr__

def _repr(self, sorted=False):
        elements = self._data.keys()
        if sorted:
            elements.sort()
        return '%s(%r)' % (self.__class__.__name__, elements)

def __iter__(self):
        """Return an iterator over the elements or a set.

This is the keys iterator for the underlying dict.
        """
        return self._data.iterkeys()

# Three-way comparison is not supported.  However, because __eq__ is
    # tried before __cmp__, if Set x == Set y, x.__eq__(y) returns True and
    # then cmp(x, y) returns 0 (Python doesn't actually call __cmp__ in this
    # case).

def __cmp__(self, other):
        raise TypeError, "can't compare sets using cmp()"

# Equality comparisons using the underlying dicts.  Mixed-type comparisons
    # are allowed here, where Set == z for non-Set z always returns False,
    # and Set != z always True.  This allows expressions like "x in y" to
    # give the expected result when y is a sequence of mixed types, not
    # raising a pointless TypeError just because y contains a Set, or x is
    # a Set and y contain's a non-set ("in" invokes only __eq__).
    # Subtle:  it would be nicer if __eq__ and __ne__ could return
    # NotImplemented instead of True or False.  Then the other comparand
    # would get a chance to determine the result, and if the other comparand
    # also returned NotImplemented then it would fall back to object address
    # comparison (which would always return False for __eq__ and always
    # True for __ne__).  However, that doesn't work, because this type
    # *also* implements __cmp__:  if, e.g., __eq__ returns NotImplemented,
    # Python tries __cmp__ next, and the __cmp__ here then raises TypeError.

def __eq__(self, other):
        if isinstance(other, BaseSet):
            return self._data == other._data
        else:
            return False

def __ne__(self, other):
        if isinstance(other, BaseSet):
            return self._data != other._data
        else:
            return True

# Copying operations

def copy(self):
        """Return a shallow copy of a set."""
        result = self.__class__()
        result._data.update(self._data)
        return result

__copy__ = copy # For the copy module

def __deepcopy__(self, memo):
        """Return a deep copy of a set; used by copy module."""
        # This pre-creates the result and inserts it in the memo
        # early, in case the deep copy recurses into another reference
        # to this same set.  A set can't be an element of itself, but
        # it can certainly contain an object that has a reference to
        # itself.
        from copy import deepcopy
        result = self.__class__()
        memo[id(self)] = result
        data = result._data
        value = True
        for elt in self:
            data[deepcopy(elt, memo)] = value
        return result

# Standard set operations: union, intersection, both differences.
    # Each has an operator version (e.g. __or__, invoked with |) and a
    # method version (e.g. union).
    # Subtle:  Each pair requires distinct code so that the outcome is
    # correct when the type of other isn't suitable.  For example, if
    # we did "union = __or__" instead, then Set().union(3) would return
    # NotImplemented instead of raising TypeError (albeit that *why* it
    # raises TypeError as-is is also a bit subtle).

def __or__(self, other):
        """Return the union of two sets as a new set.

(I.e. all elements that are in either set.)
        """
        if not isinstance(other, BaseSet):
            return NotImplemented
        return self.union(other)

def union(self, other):
        """Return the union of two sets as a new set.

(I.e. all elements that are in either set.)
        """
        result = self.__class__(self)
        result._update(other)
        return result

def __and__(self, other):
        """Return the intersection of two sets as a new set.

(I.e. all elements that are in both sets.)
        """
        if not isinstance(other, BaseSet):
            return NotImplemented
        return self.intersection(other)

def intersection(self, other):
        """Return the intersection of two sets as a new set.

(I.e. all elements that are in both sets.)
        """
        if not isinstance(other, BaseSet):
            other = Set(other)
        if len(self) <= len(other):
            little, big = self, other
        else:
            little, big = other, self
        common = ifilter(big._data.__contains__, little)
        return self.__class__(common)

def __xor__(self, other):
        """Return the symmetric difference of two sets as a new set.

(I.e. all elements that are in exactly one of the sets.)
        """
        if not isinstance(other, BaseSet):
            return NotImplemented
        return self.symmetric_difference(other)

def symmetric_difference(self, other):
        """Return the symmetric difference of two sets as a new set.

(I.e. all elements that are in exactly one of the sets.)
        """
        result = self.__class__()
        data = result._data
        value = True
        selfdata = self._data
        try:
            otherdata = other._data
        except AttributeError:
            otherdata = Set(other)._data
        for elt in ifilterfalse(otherdata.__contains__, selfdata):
            data[elt] = value
        for elt in ifilterfalse(selfdata.__contains__, otherdata):
            data[elt] = value
        return result

def  __sub__(self, other):
        """Return the difference of two sets as a new Set.

(I.e. all elements that are in this set and not in the other.)
        """
        if not isinstance(other, BaseSet):
            return NotImplemented
        return self.difference(other)

def difference(self, other):
        """Return the difference of two sets as a new Set.

(I.e. all elements that are in this set and not in the other.)
        """
        result = self.__class__()
        data = result._data
        try:
            otherdata = other._data
        except AttributeError:
            otherdata = Set(other)._data
        value = True
        for elt in ifilterfalse(otherdata.__contains__, self):
            data[elt] = value
        return result

# Membership test

def __contains__(self, element):
        """Report whether an element is a member of a set.

(Called in response to the expression `element in self'.)
        """
        try:
            return element in self._data
        except TypeError:
            transform = getattr(element, "__as_temporarily_immutable__", None)
            if transform is None:
                raise # re-raise the TypeError exception we caught
            return transform() in self._data

# Subset and superset test

def issubset(self, other):
        """Report whether another set contains this set."""
        self._binary_sanity_check(other)
        if len(self) > len(other):  # Fast check for obvious cases
            return False
        for elt in ifilterfalse(other._data.__contains__, self):
            return False
        return True

def issuperset(self, other):
        """Report whether this set contains another set."""
        self._binary_sanity_check(other)
        if len(self) < len(other):  # Fast check for obvious cases
            return False
        for elt in ifilterfalse(self._data.__contains__, other):
            return False
        return True

# Inequality comparisons using the is-subset relation.
    __le__ = issubset
    __ge__ = issuperset

def __lt__(self, other):
        self._binary_sanity_check(other)
        return len(self) < len(other) and self.issubset(other)

def __gt__(self, other):
        self._binary_sanity_check(other)
        return len(self) > len(other) and self.issuperset(other)

# We inherit object.__hash__, so we must deny this explicitly
    __hash__ = None

# Assorted helpers

def _binary_sanity_check(self, other):
        # Check that the other argument to a binary operation is also
        # a set, raising a TypeError otherwise.
        if not isinstance(other, BaseSet):
            raise TypeError, "Binary operation only permitted between sets"

def _compute_hash(self):
        # Calculate hash code for a set by xor'ing the hash codes of
        # the elements.  This ensures that the hash code does not depend
        # on the order in which elements are added to the set.  This is
        # not called __hash__ because a BaseSet should not be hashable;
        # only an ImmutableSet is hashable.
        result = 0
        for elt in self:
            result ^= hash(elt)
        return result

def _update(self, iterable):
        # The main loop for update() and the subclass __init__() methods.
        data = self._data

# Use the fast update() method when a dictionary is available.
        if isinstance(iterable, BaseSet):
            data.update(iterable._data)
            return

value = True

if type(iterable) in (list, tuple, xrange):
            # Optimized: we know that __iter__() and next() can't
            # raise TypeError, so we can move 'try:' out of the loop.
            it = iter(iterable)
            while True:
                try:
                    for element in it:
                        data[element] = value
                    return
                except TypeError:
                    transform = getattr(element, "__as_immutable__", None)
                    if transform is None:
                        raise # re-raise the TypeError exception we caught
                    data[transform()] = value
        else:
            # Safe: only catch TypeError where intended
            for element in iterable:
                try:
                    data[element] = value
                except TypeError:
                    transform = getattr(element, "__as_immutable__", None)
                    if transform is None:
                        raise # re-raise the TypeError exception we caught
                    data[transform()] = value

class ImmutableSet(BaseSet):
    """Immutable set class."""

__slots__ = ['_hashcode']

# BaseSet + hashing

def __init__(self, iterable=None):
        """Construct an immutable set from an optional iterable."""
        self._hashcode = None
        self._data = {}
        if iterable is not None:
            self._update(iterable)

def __hash__(self):
        if self._hashcode is None:
            self._hashcode = self._compute_hash()
        return self._hashcode

def __getstate__(self):
        return self._data, self._hashcode

def __setstate__(self, state):
        self._data, self._hashcode = state

class Set(BaseSet):
    """ Mutable set class."""

__slots__ = []

# BaseSet + operations requiring mutability; no hashing

def __init__(self, iterable=None):
        """Construct a set from an optional iterable."""
        self._data = {}
        if iterable is not None:
            self._update(iterable)

def __getstate__(self):
        # getstate's results are ignored if it is not
        return self._data,

def __setstate__(self, data):
        self._data, = data

# In-place union, intersection, differences.
    # Subtle:  The xyz_update() functions deliberately return None,
    # as do all mutating operations on built-in container types.
    # The __xyz__ spellings have to return self, though.

def __ior__(self, other):
        """Update a set with the union of itself and another."""
        self._binary_sanity_check(other)
        self._data.update(other._data)
        return self

def union_update(self, other):
        """Update a set with the union of itself and another."""
        self._update(other)

def __iand__(self, other):
        """Update a set with the intersection of itself and another."""
        self._binary_sanity_check(other)
        self._data = (self & other)._data
        return self

def intersection_update(self, other):
        """Update a set with the intersection of itself and another."""
        if isinstance(other, BaseSet):
            self &= other
        else:
            self._data = (self.intersection(other))._data

def __ixor__(self, other):
        """Update a set with the symmetric difference of itself and another."""
        self._binary_sanity_check(other)
        self.symmetric_difference_update(other)
        return self

def symmetric_difference_update(self, other):
        """Update a set with the symmetric difference of itself and another."""
        data = self._data
        value = True
        if not isinstance(other, BaseSet):
            other = Set(other)
        if self is other:
            self.clear()
        for elt in other:
            if elt in data:
                del data[elt]
            else:
                data[elt] = value

def __isub__(self, other):
        """Remove all elements of another set from this set."""
        self._binary_sanity_check(other)
        self.difference_update(other)
        return self

def difference_update(self, other):
        """Remove all elements of another set from this set."""
        data = self._data
        if not isinstance(other, BaseSet):
            other = Set(other)
        if self is other:
            self.clear()
        for elt in ifilter(data.__contains__, other):
            del data[elt]

# Python dict-like mass mutations: update, clear

def update(self, iterable):
        """Add all values from an iterable (such as a list or file)."""
        self._update(iterable)

def clear(self):
        """Remove all elements from this set."""
        self._data.clear()

# Single-element mutations: add, remove, discard

def add(self, element):
        """Add an element to a set.

This has no effect if the element is already present.
        """
        try:
            self._data[element] = True
        except TypeError:
            transform = getattr(element, "__as_immutable__", None)
            if transform is None:
                raise # re-raise the TypeError exception we caught
            self._data[transform()] = True

def remove(self, element):
        """Remove an element from a set; it must be a member.

If the element is not a member, raise a KeyError.
        """
        try:
            del self._data[element]
        except TypeError:
            transform = getattr(element, "__as_temporarily_immutable__", None)
            if transform is None:
                raise # re-raise the TypeError exception we caught
            del self._data[transform()]

def discard(self, element):
        """Remove an element from a set if it is a member.

If the element is not a member, do nothing.
        """
        try:
            self.remove(element)
        except KeyError:
            pass

def pop(self):
        """Remove and return an arbitrary set element."""
        return self._data.popitem()[0]

def __as_immutable__(self):
        # Return a copy of self as an immutable set
        return ImmutableSet(self)

def __as_temporarily_immutable__(self):
        # Return self wrapped in a temporarily immutable set
        return _TemporarilyImmutableSet(self)

class _TemporarilyImmutableSet(BaseSet):
    # Wrap a mutable set as if it was temporarily immutable.
    # This only supplies hashing and equality comparisons.

def __init__(self, set):
        self._set = set
        self._data = set._data  # Needed by ImmutableSet.__eq__()

def __hash__(self):
        return self._set._compute_hash()