FM / python3.8

/snap/core20/2769/usr/lib/python3.8

Name	Size	Mode	Actions
asyncio/	-	0755	rm
collections/	-	0755	rm
concurrent/	-	0755	rm
ctypes/	-	0755	rm
curses/	-	0755	rm
dbm/	-	0755	rm
distutils/	-	0755	rm
email/	-	0755	rm
encodings/	-	0755	rm
html/	-	0755	rm
http/	-	0755	rm
importlib/	-	0755	rm
json/	-	0755	rm
lib-dynload/	-	0755	rm
lib2to3/	-	0755	rm
logging/	-	0755	rm
multiprocessing/	-	0755	rm
pydoc_data/	-	0755	rm
sqlite3/	-	0755	rm
test/	-	0755	rm
unittest/	-	0755	rm
urllib/	-	0755	rm
venv/	-	0755	rm
wsgiref/	-	0755	rm
xml/	-	0755	rm
xmlrpc/	-	0755	rm
__pycache__/	-	0755	rm
abc.py	4489	0644	edit dl rm
aifc.py	32814	0644	edit dl rm
antigravity.py	477	0644	edit dl rm
argparse.py	96311	0644	edit dl rm
ast.py	19234	0644	edit dl rm
asynchat.py	11328	0644	edit dl rm
asyncore.py	20094	0644	edit dl rm
base64.py	20382	0755	edit dl rm
bdb.py	32056	0644	edit dl rm
binhex.py	13954	0644	edit dl rm
bisect.py	2214	0644	edit dl rm
bz2.py	12558	0644	edit dl rm
calendar.py	24832	0644	edit dl rm
cgi.py	33932	0755	edit dl rm
cgitb.py	12096	0644	edit dl rm
chunk.py	5435	0644	edit dl rm
cmd.py	14860	0644	edit dl rm
code.py	10622	0644	edit dl rm
codecs.py	36667	0644	edit dl rm
codeop.py	6330	0644	edit dl rm
colorsys.py	4064	0644	edit dl rm
compileall.py	13678	0644	edit dl rm
configparser.py	54374	0644	edit dl rm
contextlib.py	24995	0644	edit dl rm
contextvars.py	129	0644	edit dl rm
copy.py	8661	0644	edit dl rm
copyreg.py	7135	0644	edit dl rm
cProfile.py	6998	0755	edit dl rm
crypt.py	3610	0644	edit dl rm
csv.py	16144	0644	edit dl rm
dataclasses.py	49973	0644	edit dl rm
datetime.py	88287	0644	edit dl rm
decimal.py	320	0644	edit dl rm
difflib.py	84058	0644	edit dl rm
dis.py	20570	0644	edit dl rm
doctest.py	104543	0644	edit dl rm
dummy_threading.py	2815	0644	edit dl rm
enum.py	38136	0644	edit dl rm
filecmp.py	9830	0644	edit dl rm
fileinput.py	14709	0644	edit dl rm
fnmatch.py	4079	0644	edit dl rm
formatter.py	15143	0644	edit dl rm
fractions.py	24329	0644	edit dl rm
ftplib.py	35129	0644	edit dl rm
functools.py	37406	0644	edit dl rm
genericpath.py	4975	0644	edit dl rm
getopt.py	7489	0644	edit dl rm
getpass.py	5994	0644	edit dl rm
gettext.py	27565	0644	edit dl rm
glob.py	5697	0644	edit dl rm
gzip.py	21413	0644	edit dl rm
hashlib.py	9730	0644	edit dl rm
heapq.py	22877	0644	edit dl rm
hmac.py	6629	0644	edit dl rm
imaplib.py	53775	0644	edit dl rm
imghdr.py	3808	0644	edit dl rm
imp.py	10536	0644	edit dl rm
inspect.py	118550	0644	edit dl rm
io.py	3541	0644	edit dl rm
ipaddress.py	76336	0644	edit dl rm
keyword.py	945	0644	edit dl rm
LICENSE.txt	13925	0644	edit dl rm
linecache.py	5330	0644	edit dl rm
locale.py	78195	0644	edit dl rm
lzma.py	12983	0644	edit dl rm
mailbox.py	78661	0644	edit dl rm
mailcap.py	9067	0644	edit dl rm
mimetypes.py	21664	0644	edit dl rm
modulefinder.py	24430	0644	edit dl rm
netrc.py	5566	0644	edit dl rm
nntplib.py	43261	0644	edit dl rm
ntpath.py	25814	0644	edit dl rm
nturl2path.py	2887	0644	edit dl rm
numbers.py	10244	0644	edit dl rm
opcode.py	5808	0644	edit dl rm
operator.py	10711	0644	edit dl rm
optparse.py	60369	0644	edit dl rm
os.py	38995	0644	edit dl rm
pathlib.py	52610	0644	edit dl rm
pdb.py	62738	0755	edit dl rm
pickle.py	64467	0644	edit dl rm
pickletools.py	93486	0644	edit dl rm
pipes.py	8916	0644	edit dl rm
pkgutil.py	21461	0644	edit dl rm
platform.py	40425	0755	edit dl rm
plistlib.py	32460	0644	edit dl rm
poplib.py	15200	0644	edit dl rm
posixpath.py	15500	0644	edit dl rm
pprint.py	21484	0644	edit dl rm
profile.py	23534	0755	edit dl rm
pstats.py	27345	0644	edit dl rm
pty.py	4807	0644	edit dl rm
pyclbr.py	15255	0644	edit dl rm
pydoc.py	106863	0755	edit dl rm
py_compile.py	8148	0644	edit dl rm
queue.py	11356	0644	edit dl rm
quopri.py	7252	0755	edit dl rm
random.py	28802	0644	edit dl rm
re.py	15861	0644	edit dl rm
reprlib.py	5267	0644	edit dl rm
rlcompleter.py	7097	0644	edit dl rm
runpy.py	12052	0644	edit dl rm
sched.py	6442	0644	edit dl rm
secrets.py	2038	0644	edit dl rm
selectors.py	18561	0644	edit dl rm
shelve.py	8527	0644	edit dl rm
shlex.py	13325	0644	edit dl rm
shutil.py	51474	0644	edit dl rm
signal.py	2273	0644	edit dl rm
site.py	22336	0644	edit dl rm
sitecustomize.py	-	0	edit dl rm
smtpd.py	34709	0755	edit dl rm
smtplib.py	44804	0755	edit dl rm
sndhdr.py	7099	0644	edit dl rm
socket.py	35243	0644	edit dl rm
socketserver.py	27296	0644	edit dl rm
sre_compile.py	26695	0644	edit dl rm
sre_constants.py	7154	0644	edit dl rm
sre_parse.py	40230	0644	edit dl rm
ssl.py	52363	0644	edit dl rm
stat.py	5485	0644	edit dl rm
statistics.py	39690	0644	edit dl rm
string.py	10535	0644	edit dl rm
stringprep.py	12917	0644	edit dl rm
struct.py	257	0644	edit dl rm
subprocess.py	77330	0644	edit dl rm
sunau.py	18375	0644	edit dl rm
symbol.py	2109	0644	edit dl rm
symtable.py	8021	0644	edit dl rm
sysconfig.py	25035	0644	edit dl rm
tabnanny.py	11406	0755	edit dl rm
tarfile.py	95580	0755	edit dl rm
telnetlib.py	23254	0644	edit dl rm
tempfile.py	32920	0644	edit dl rm
textwrap.py	19407	0644	edit dl rm
this.py	1003	0644	edit dl rm
threading.py	50820	0644	edit dl rm
timeit.py	13480	0755	edit dl rm
token.py	2368	0644	edit dl rm
tokenize.py	25841	0644	edit dl rm
trace.py	29858	0755	edit dl rm
traceback.py	23611	0644	edit dl rm
tracemalloc.py	17076	0644	edit dl rm
tty.py	879	0644	edit dl rm
turtle.py	143716	0644	edit dl rm
types.py	9713	0644	edit dl rm
typing.py	68962	0644	edit dl rm
uu.py	6957	0755	edit dl rm
uuid.py	30466	0644	edit dl rm
warnings.py	19688	0644	edit dl rm
wave.py	18230	0644	edit dl rm
weakref.py	21387	0644	edit dl rm
webbrowser.py	24083	0755	edit dl rm
xdrlib.py	5913	0644	edit dl rm
zipapp.py	7535	0644	edit dl rm
zipfile.py	89135	0644	edit dl rm
zipimport.py	30765	0644	edit dl rm
_bootlocale.py	1801	0644	edit dl rm
_collections_abc.py	26100	0644	edit dl rm
_compat_pickle.py	8749	0644	edit dl rm
_compression.py	5340	0644	edit dl rm
_dummy_thread.py	6027	0644	edit dl rm
_markupbase.py	14598	0644	edit dl rm
_osx_support.py	21774	0644	edit dl rm
_pydecimal.py	228666	0644	edit dl rm
_pyio.py	93177	0644	edit dl rm
_py_abc.py	6189	0644	edit dl rm
_sitebuiltins.py	3115	0644	edit dl rm
_strptime.py	25268	0644	edit dl rm
_sysconfigdata__linux_x86_64-linux-gnu.py	25834	0644	edit dl rm
_sysconfigdata__x86_64-linux-gnu.py	25834	0644	edit dl rm
_threading_local.py	7220	0644	edit dl rm
_weakrefset.py	5735	0644	edit dl rm
__future__.py	5147	0644	edit dl rm
__phello__.foo.py	64	0644	edit dl rm

Edit: /snap/core20/2769/usr/lib/python3.8/traceback.py (23611B)

"""Extract, format and print information about Python stack traces."""

import collections
import itertools
import linecache
import sys

__all__ = ['extract_stack', 'extract_tb', 'format_exception',
           'format_exception_only', 'format_list', 'format_stack',
           'format_tb', 'print_exc', 'format_exc', 'print_exception',
           'print_last', 'print_stack', 'print_tb', 'clear_frames',
           'FrameSummary', 'StackSummary', 'TracebackException',
           'walk_stack', 'walk_tb']

#
# Formatting and printing lists of traceback lines.
#

def print_list(extracted_list, file=None):
    """Print the list of tuples as returned by extract_tb() or
    extract_stack() as a formatted stack trace to the given file."""
    if file is None:
        file = sys.stderr
    for item in StackSummary.from_list(extracted_list).format():
        print(item, file=file, end="")

def format_list(extracted_list):
    """Format a list of tuples or FrameSummary objects for printing.

Given a list of tuples or FrameSummary objects as returned by
    extract_tb() or extract_stack(), return a list of strings ready
    for printing.

Each string in the resulting list corresponds to the item with the
    same index in the argument list.  Each string ends in a newline;
    the strings may contain internal newlines as well, for those items
    whose source text line is not None.
    """
    return StackSummary.from_list(extracted_list).format()

#
# Printing and Extracting Tracebacks.
#

def print_tb(tb, limit=None, file=None):
    """Print up to 'limit' stack trace entries from the traceback 'tb'.

If 'limit' is omitted or None, all entries are printed.  If 'file'
    is omitted or None, the output goes to sys.stderr; otherwise
    'file' should be an open file or file-like object with a write()
    method.
    """
    print_list(extract_tb(tb, limit=limit), file=file)

def format_tb(tb, limit=None):
    """A shorthand for 'format_list(extract_tb(tb, limit))'."""
    return extract_tb(tb, limit=limit).format()

def extract_tb(tb, limit=None):
    """
    Return a StackSummary object representing a list of
    pre-processed entries from traceback.

This is useful for alternate formatting of stack traces.  If
    'limit' is omitted or None, all entries are extracted.  A
    pre-processed stack trace entry is a FrameSummary object
    containing attributes filename, lineno, name, and line
    representing the information that is usually printed for a stack
    trace.  The line is a string with leading and trailing
    whitespace stripped; if the source is not available it is None.
    """
    return StackSummary.extract(walk_tb(tb), limit=limit)

#
# Exception formatting and output.
#

_cause_message = (
    "\nThe above exception was the direct cause "
    "of the following exception:\n\n")

_context_message = (
    "\nDuring handling of the above exception, "
    "another exception occurred:\n\n")

def print_exception(etype, value, tb, limit=None, file=None, chain=True):
    """Print exception up to 'limit' stack trace entries from 'tb' to 'file'.

This differs from print_tb() in the following ways: (1) if
    traceback is not None, it prints a header "Traceback (most recent
    call last):"; (2) it prints the exception type and value after the
    stack trace; (3) if type is SyntaxError and value has the
    appropriate format, it prints the line where the syntax error
    occurred with a caret on the next line indicating the approximate
    position of the error.
    """
    # format_exception has ignored etype for some time, and code such as cgitb
    # passes in bogus values as a result. For compatibility with such code we
    # ignore it here (rather than in the new TracebackException API).
    if file is None:
        file = sys.stderr
    for line in TracebackException(
            type(value), value, tb, limit=limit).format(chain=chain):
        print(line, file=file, end="")

def format_exception(etype, value, tb, limit=None, chain=True):
    """Format a stack trace and the exception information.

The arguments have the same meaning as the corresponding arguments
    to print_exception().  The return value is a list of strings, each
    ending in a newline and some containing internal newlines.  When
    these lines are concatenated and printed, exactly the same text is
    printed as does print_exception().
    """
    # format_exception has ignored etype for some time, and code such as cgitb
    # passes in bogus values as a result. For compatibility with such code we
    # ignore it here (rather than in the new TracebackException API).
    return list(TracebackException(
        type(value), value, tb, limit=limit).format(chain=chain))

def format_exception_only(etype, value):
    """Format the exception part of a traceback.

The arguments are the exception type and value such as given by
    sys.last_type and sys.last_value. The return value is a list of
    strings, each ending in a newline.

Normally, the list contains a single string; however, for
    SyntaxError exceptions, it contains several lines that (when
    printed) display detailed information about where the syntax
    error occurred.

The message indicating which exception occurred is always the last
    string in the list.

"""
    return list(TracebackException(etype, value, None).format_exception_only())

# -- not official API but folk probably use these two functions.

def _format_final_exc_line(etype, value):
    valuestr = _some_str(value)
    if value is None or not valuestr:
        line = "%s\n" % etype
    else:
        line = "%s: %s\n" % (etype, valuestr)
    return line

def _some_str(value):
    try:
        return str(value)
    except:
        return '<unprintable %s object>' % type(value).__name__

# --

def print_exc(limit=None, file=None, chain=True):
    """Shorthand for 'print_exception(*sys.exc_info(), limit, file)'."""
    print_exception(*sys.exc_info(), limit=limit, file=file, chain=chain)

def format_exc(limit=None, chain=True):
    """Like print_exc() but return a string."""
    return "".join(format_exception(*sys.exc_info(), limit=limit, chain=chain))

def print_last(limit=None, file=None, chain=True):
    """This is a shorthand for 'print_exception(sys.last_type,
    sys.last_value, sys.last_traceback, limit, file)'."""
    if not hasattr(sys, "last_type"):
        raise ValueError("no last exception")
    print_exception(sys.last_type, sys.last_value, sys.last_traceback,
                    limit, file, chain)

#
# Printing and Extracting Stacks.
#

def print_stack(f=None, limit=None, file=None):
    """Print a stack trace from its invocation point.

The optional 'f' argument can be used to specify an alternate
    stack frame at which to start. The optional 'limit' and 'file'
    arguments have the same meaning as for print_exception().
    """
    if f is None:
        f = sys._getframe().f_back
    print_list(extract_stack(f, limit=limit), file=file)

def format_stack(f=None, limit=None):
    """Shorthand for 'format_list(extract_stack(f, limit))'."""
    if f is None:
        f = sys._getframe().f_back
    return format_list(extract_stack(f, limit=limit))

def extract_stack(f=None, limit=None):
    """Extract the raw traceback from the current stack frame.

The return value has the same format as for extract_tb().  The
    optional 'f' and 'limit' arguments have the same meaning as for
    print_stack().  Each item in the list is a quadruple (filename,
    line number, function name, text), and the entries are in order
    from oldest to newest stack frame.
    """
    if f is None:
        f = sys._getframe().f_back
    stack = StackSummary.extract(walk_stack(f), limit=limit)
    stack.reverse()
    return stack

def clear_frames(tb):
    "Clear all references to local variables in the frames of a traceback."
    while tb is not None:
        try:
            tb.tb_frame.clear()
        except RuntimeError:
            # Ignore the exception raised if the frame is still executing.
            pass
        tb = tb.tb_next

class FrameSummary:
    """A single frame from a traceback.

- :attr:`filename` The filename for the frame.
    - :attr:`lineno` The line within filename for the frame that was
      active when the frame was captured.
    - :attr:`name` The name of the function or method that was executing
      when the frame was captured.
    - :attr:`line` The text from the linecache module for the
      of code that was running when the frame was captured.
    - :attr:`locals` Either None if locals were not supplied, or a dict
      mapping the name to the repr() of the variable.
    """

__slots__ = ('filename', 'lineno', 'name', '_line', 'locals')

def __init__(self, filename, lineno, name, *, lookup_line=True,
            locals=None, line=None):
        """Construct a FrameSummary.

:param lookup_line: If True, `linecache` is consulted for the source
            code line. Otherwise, the line will be looked up when first needed.
        :param locals: If supplied the frame locals, which will be captured as
            object representations.
        :param line: If provided, use this instead of looking up the line in
            the linecache.
        """
        self.filename = filename
        self.lineno = lineno
        self.name = name
        self._line = line
        if lookup_line:
            self.line
        self.locals = {k: repr(v) for k, v in locals.items()} if locals else None

def __eq__(self, other):
        if isinstance(other, FrameSummary):
            return (self.filename == other.filename and
                    self.lineno == other.lineno and
                    self.name == other.name and
                    self.locals == other.locals)
        if isinstance(other, tuple):
            return (self.filename, self.lineno, self.name, self.line) == other
        return NotImplemented

def __getitem__(self, pos):
        return (self.filename, self.lineno, self.name, self.line)[pos]

def __iter__(self):
        return iter([self.filename, self.lineno, self.name, self.line])

def __repr__(self):
        return "<FrameSummary file {filename}, line {lineno} in {name}>".format(
            filename=self.filename, lineno=self.lineno, name=self.name)

def __len__(self):
        return 4

@property
    def line(self):
        if self._line is None:
            self._line = linecache.getline(self.filename, self.lineno).strip()
        return self._line

def walk_stack(f):
    """Walk a stack yielding the frame and line number for each frame.

This will follow f.f_back from the given frame. If no frame is given, the
    current stack is used. Usually used with StackSummary.extract.
    """
    if f is None:
        f = sys._getframe().f_back.f_back
    while f is not None:
        yield f, f.f_lineno
        f = f.f_back

def walk_tb(tb):
    """Walk a traceback yielding the frame and line number for each frame.

This will follow tb.tb_next (and thus is in the opposite order to
    walk_stack). Usually used with StackSummary.extract.
    """
    while tb is not None:
        yield tb.tb_frame, tb.tb_lineno
        tb = tb.tb_next

_RECURSIVE_CUTOFF = 3 # Also hardcoded in traceback.c.

class StackSummary(list):
    """A stack of frames."""

@classmethod
    def extract(klass, frame_gen, *, limit=None, lookup_lines=True,
            capture_locals=False):
        """Create a StackSummary from a traceback or stack object.

:param frame_gen: A generator that yields (frame, lineno) tuples to
            include in the stack.
        :param limit: None to include all frames or the number of frames to
            include.
        :param lookup_lines: If True, lookup lines for each frame immediately,
            otherwise lookup is deferred until the frame is rendered.
        :param capture_locals: If True, the local variables from each frame will
            be captured as object representations into the FrameSummary.
        """
        if limit is None:
            limit = getattr(sys, 'tracebacklimit', None)
            if limit is not None and limit < 0:
                limit = 0
        if limit is not None:
            if limit >= 0:
                frame_gen = itertools.islice(frame_gen, limit)
            else:
                frame_gen = collections.deque(frame_gen, maxlen=-limit)

result = klass()
        fnames = set()
        for f, lineno in frame_gen:
            co = f.f_code
            filename = co.co_filename
            name = co.co_name

fnames.add(filename)
            linecache.lazycache(filename, f.f_globals)
            # Must defer line lookups until we have called checkcache.
            if capture_locals:
                f_locals = f.f_locals
            else:
                f_locals = None
            result.append(FrameSummary(
                filename, lineno, name, lookup_line=False, locals=f_locals))
        for filename in fnames:
            linecache.checkcache(filename)
        # If immediate lookup was desired, trigger lookups now.
        if lookup_lines:
            for f in result:
                f.line
        return result

@classmethod
    def from_list(klass, a_list):
        """
        Create a StackSummary object from a supplied list of
        FrameSummary objects or old-style list of tuples.
        """
        # While doing a fast-path check for isinstance(a_list, StackSummary) is
        # appealing, idlelib.run.cleanup_traceback and other similar code may
        # break this by making arbitrary frames plain tuples, so we need to
        # check on a frame by frame basis.
        result = StackSummary()
        for frame in a_list:
            if isinstance(frame, FrameSummary):
                result.append(frame)
            else:
                filename, lineno, name, line = frame
                result.append(FrameSummary(filename, lineno, name, line=line))
        return result

def format(self):
        """Format the stack ready for printing.

Returns a list of strings ready for printing.  Each string in the
        resulting list corresponds to a single frame from the stack.
        Each string ends in a newline; the strings may contain internal
        newlines as well, for those items with source text lines.

For long sequences of the same frame and line, the first few
        repetitions are shown, followed by a summary line stating the exact
        number of further repetitions.
        """
        result = []
        last_file = None
        last_line = None
        last_name = None
        count = 0
        for frame in self:
            if (last_file is None or last_file != frame.filename or
                last_line is None or last_line != frame.lineno or
                last_name is None or last_name != frame.name):
                if count > _RECURSIVE_CUTOFF:
                    count -= _RECURSIVE_CUTOFF
                    result.append(
                        f'  [Previous line repeated {count} more '
                        f'time{"s" if count > 1 else ""}]\n'
                    )
                last_file = frame.filename
                last_line = frame.lineno
                last_name = frame.name
                count = 0
            count += 1
            if count > _RECURSIVE_CUTOFF:
                continue
            row = []
            row.append('  File "{}", line {}, in {}\n'.format(
                frame.filename, frame.lineno, frame.name))
            if frame.line:
                row.append('    {}\n'.format(frame.line.strip()))
            if frame.locals:
                for name, value in sorted(frame.locals.items()):
                    row.append('    {name} = {value}\n'.format(name=name, value=value))
            result.append(''.join(row))
        if count > _RECURSIVE_CUTOFF:
            count -= _RECURSIVE_CUTOFF
            result.append(
                f'  [Previous line repeated {count} more '
                f'time{"s" if count > 1 else ""}]\n'
            )
        return result

class TracebackException:
    """An exception ready for rendering.

The traceback module captures enough attributes from the original exception
    to this intermediary form to ensure that no references are held, while
    still being able to fully print or format it.

Use `from_exception` to create TracebackException instances from exception
    objects, or the constructor to create TracebackException instances from
    individual components.

- :attr:`__cause__` A TracebackException of the original *__cause__*.
    - :attr:`__context__` A TracebackException of the original *__context__*.
    - :attr:`__suppress_context__` The *__suppress_context__* value from the
      original exception.
    - :attr:`stack` A `StackSummary` representing the traceback.
    - :attr:`exc_type` The class of the original traceback.
    - :attr:`filename` For syntax errors - the filename where the error
      occurred.
    - :attr:`lineno` For syntax errors - the linenumber where the error
      occurred.
    - :attr:`text` For syntax errors - the text where the error
      occurred.
    - :attr:`offset` For syntax errors - the offset into the text where the
      error occurred.
    - :attr:`msg` For syntax errors - the compiler error message.
    """

def __init__(self, exc_type, exc_value, exc_traceback, *, limit=None,
            lookup_lines=True, capture_locals=False, _seen=None):
        # NB: we need to accept exc_traceback, exc_value, exc_traceback to
        # permit backwards compat with the existing API, otherwise we
        # need stub thunk objects just to glue it together.
        # Handle loops in __cause__ or __context__.
        if _seen is None:
            _seen = set()
        _seen.add(id(exc_value))
        # Gracefully handle (the way Python 2.4 and earlier did) the case of
        # being called with no type or value (None, None, None).
        if (exc_value and exc_value.__cause__ is not None
            and id(exc_value.__cause__) not in _seen):
            cause = TracebackException(
                type(exc_value.__cause__),
                exc_value.__cause__,
                exc_value.__cause__.__traceback__,
                limit=limit,
                lookup_lines=False,
                capture_locals=capture_locals,
                _seen=_seen)
        else:
            cause = None
        if (exc_value and exc_value.__context__ is not None
            and id(exc_value.__context__) not in _seen):
            context = TracebackException(
                type(exc_value.__context__),
                exc_value.__context__,
                exc_value.__context__.__traceback__,
                limit=limit,
                lookup_lines=False,
                capture_locals=capture_locals,
                _seen=_seen)
        else:
            context = None
        self.__cause__ = cause
        self.__context__ = context
        self.__suppress_context__ = \
            exc_value.__suppress_context__ if exc_value else False
        # TODO: locals.
        self.stack = StackSummary.extract(
            walk_tb(exc_traceback), limit=limit, lookup_lines=lookup_lines,
            capture_locals=capture_locals)
        self.exc_type = exc_type
        # Capture now to permit freeing resources: only complication is in the
        # unofficial API _format_final_exc_line
        self._str = _some_str(exc_value)
        if exc_type and issubclass(exc_type, SyntaxError):
            # Handle SyntaxError's specially
            self.filename = exc_value.filename
            lno = exc_value.lineno
            self.lineno = str(lno) if lno is not None else None
            self.text = exc_value.text
            self.offset = exc_value.offset
            self.msg = exc_value.msg
        if lookup_lines:
            self._load_lines()

@classmethod
    def from_exception(cls, exc, *args, **kwargs):
        """Create a TracebackException from an exception."""
        return cls(type(exc), exc, exc.__traceback__, *args, **kwargs)

def _load_lines(self):
        """Private API. force all lines in the stack to be loaded."""
        for frame in self.stack:
            frame.line
        if self.__context__:
            self.__context__._load_lines()
        if self.__cause__:
            self.__cause__._load_lines()

def __eq__(self, other):
        return self.__dict__ == other.__dict__

def __str__(self):
        return self._str

def format_exception_only(self):
        """Format the exception part of the traceback.

The return value is a generator of strings, each ending in a newline.

Normally, the generator emits a single string; however, for
        SyntaxError exceptions, it emits several lines that (when
        printed) display detailed information about where the syntax
        error occurred.

The message indicating which exception occurred is always the last
        string in the output.
        """
        if self.exc_type is None:
            yield _format_final_exc_line(None, self._str)
            return

stype = self.exc_type.__qualname__
        smod = self.exc_type.__module__
        if smod not in ("__main__", "builtins"):
            stype = smod + '.' + stype

if not issubclass(self.exc_type, SyntaxError):
            yield _format_final_exc_line(stype, self._str)
            return

# It was a syntax error; show exactly where the problem was found.
        filename_suffix = ''
        if self.lineno is not None:
            yield '  File "{}", line {}\n'.format(
                self.filename or "<string>", self.lineno)
        elif self.filename is not None:
            filename_suffix = ' ({})'.format(self.filename)

badline = self.text
        offset = self.offset
        if badline is not None:
            yield '    {}\n'.format(badline.strip())
            if offset is not None:
                caretspace = badline.rstrip('\n')
                offset = min(len(caretspace), offset) - 1
                caretspace = caretspace[:offset].lstrip()
                # non-space whitespace (likes tabs) must be kept for alignment
                caretspace = ((c.isspace() and c or ' ') for c in caretspace)
                yield '    {}^\n'.format(''.join(caretspace))
        msg = self.msg or "<no detail available>"
        yield "{}: {}{}\n".format(stype, msg, filename_suffix)

def format(self, *, chain=True):
        """Format the exception.

If chain is not *True*, *__cause__* and *__context__* will not be formatted.

The return value is a generator of strings, each ending in a newline and
        some containing internal newlines. `print_exception` is a wrapper around
        this method which just prints the lines to a file.

The message indicating which exception occurred is always the last
        string in the output.
        """
        if chain:
            if self.__cause__ is not None:
                yield from self.__cause__.format(chain=chain)
                yield _cause_message
            elif (self.__context__ is not None and
                not self.__suppress_context__):
                yield from self.__context__.format(chain=chain)
                yield _context_message
        if self.stack:
            yield 'Traceback (most recent call last):\n'
            yield from self.stack.format()
        yield from self.format_exception_only()

cmd: