def _StackSummary_extract(frame_gen,
limit=None,
lookup_lines=True,
capture_locals=False):
"""Create a StackSummary from a traceback or stack object.
Very simplified copy of the original StackSummary.extract().
We want always to capture locals, that is why we overwrite it.
Additionally, we also capture the frame.
This is a bit hacky and also not like this is originally intended (to not keep refs).
: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.
"""
result = StackSummary()
for f, lineno in frame_gen:
co = f.f_code
filename = co.co_filename
name = co.co_name
result.append(
ExtendedFrameSummary(frame=f,
filename=filename,
lineno=lineno,
name=name,
lookup_line=False))
return result
def _remove_frame_from_stack(tbss: StackSummary,
framename: str) -> StackSummary:
filtered_stack_list: List[traceback.FrameSummary] = \
list(filter(lambda frame: getattr(frame,
'filename') != framename, tbss))
filtered_stack: StackSummary = StackSummary.from_list(filtered_stack_list)
return filtered_stack
def get_exception_details():
from traceback import walk_tb, StackSummary, FrameSummary
from time import strftime
cla, exc, exc_traceback = sys.exc_info()
exc_args = exc.__dict__["args"] if "args" in exc.__dict__ else "<no args>"
ex_title = cla.__name__ + ": Exception:" + str(exc) + " - args:" + str(
exc_args)
msgs = [
ex_title,
]
except_location = ""
tb: list[FrameSummary] = StackSummary.extract(walk_tb(exc_traceback),
limit=None,
capture_locals=True)
for frame in tb:
local_vars_info = []
if frame.locals:
for name, value in frame.locals.items():
if name == "self":
continue
local_vars_info.append(f'\t{name} = {value}')
except_location += "\n" + frame.filename + ":" + str(frame.lineno) + " \n" + str(frame.name) + \
"\n<Args>:" + "\n".join(local_vars_info)
msgs.insert(1, except_location)
time = strftime("%Y-%m-%d %H:%M:%S")
return time + " - " + ("".join(msgs))
def iter_traceback(tb=None, enforce_most_recent_call_first=False):
"""
Iterates a traceback of various formats:
- traceback (types.TracebackType)
- frame object (types.FrameType)
- stack summary (traceback.StackSummary)
:param types.TracebackType|types.FrameType|StackSummary|None tb: traceback. if None, will use sys._getframe
:param bool enforce_most_recent_call_first:
Frame or stack summery: most recent call first (top of the stack is the first entry in the result)
Traceback: most recent call last
If True, and we get traceback, will unroll and reverse, such that we have always the most recent call first.
:return: yields the frames (types.FrameType)
:rtype: list[types.FrameType|DummyFrame]
"""
if tb is None:
tb = get_current_frame()
def is_stack_summary(_tb):
return isinstance(_tb, StackSummary)
is_frame = inspect.isframe
is_traceback = inspect.istraceback
assert is_traceback(tb) or is_frame(tb) or is_stack_summary(tb)
# Frame or stack summery: most recent call first
# Traceback: most recent call last
if is_traceback(tb) and enforce_most_recent_call_first:
frames = list(iter_traceback(tb))
for frame in frames[::-1]:
yield frame
return
_tb = tb
while _tb is not None:
if is_frame(_tb):
frame = _tb
elif is_stack_summary(_tb):
if isinstance(_tb[0], ExtendedFrameSummary):
frame = _tb[0].tb_frame
else:
frame = DummyFrame.from_frame_summary(_tb[0])
else:
frame = _tb.tb_frame
yield frame
if is_frame(_tb):
_tb = _tb.f_back
elif is_stack_summary(_tb):
_tb = StackSummary.from_list(_tb[1:])
if not _tb:
_tb = None
else:
_tb = _tb.tb_next
def except_hook(
exc_type: Type[BaseException], exc_value: BaseException, tb: TracebackType
) -> None:
exception_config: Union[DeveloperExceptionConfig, None] = getattr(
exc_value, _typer_developer_exception_attr_name, None
)
standard_traceback = os.getenv("_TYPER_STANDARD_TRACEBACK")
if (
standard_traceback
or not exception_config
or not exception_config.pretty_exceptions_enable
):
_original_except_hook(exc_type, exc_value, tb)
return
typer_path = os.path.dirname(__file__)
click_path = os.path.dirname(click.__file__)
supress_internal_dir_names = [typer_path, click_path]
exc = exc_value
if rich:
rich_tb = Traceback.from_exception(
type(exc),
exc,
exc.__traceback__,
show_locals=exception_config.pretty_exceptions_show_locals,
suppress=supress_internal_dir_names,
)
console_stderr.print(rich_tb)
return
tb_exc = traceback.TracebackException.from_exception(exc)
stack: List[FrameSummary] = []
for frame in tb_exc.stack:
if any(
[frame.filename.startswith(path) for path in supress_internal_dir_names]
):
if not exception_config.pretty_exceptions_short:
# Hide the line for internal libraries, Typer and Click
stack.append(
traceback.FrameSummary(
filename=frame.filename,
lineno=frame.lineno,
name=frame.name,
line="",
)
)
else:
stack.append(frame)
# Type ignore ref: https://github.com/python/typeshed/pull/8244
final_stack_summary = StackSummary.from_list(stack) # type: ignore
tb_exc.stack = final_stack_summary
for line in tb_exc.format():
print(line, file=sys.stderr)
return
def __post_init__(self, function, test_id):
file_frame = FrameSummary(
inspect.getfile(function),
docs_start_lineno(function) + self.path.line,
function.__name__,
lookup_line=False,
)
dynamic_frame = FrameSummary(test_id,
1,
function.__name__,
lookup_line=False,
line=self.path)
self.stack = StackSummary.from_list([file_frame, dynamic_frame])
def _StackSummary_extract(frame_gen, limit=None, lookup_lines=True, capture_locals=False):
"""Create a StackSummary from a traceback or stack object.
Very simplified copy of the original StackSummary.extract().
We want always to capture locals, that is why we overwrite it.
Additionally, we also capture the frame.
This is a bit hacky and also not like this is originally intended (to not keep refs).
: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.
"""
result = StackSummary()
for f, lineno in frame_gen:
co = f.f_code
filename = co.co_filename
name = co.co_name
result.append(ExtendedFrameSummary(
frame=f, filename=filename, lineno=lineno, name=name, lookup_line=False))
return result
def print_task_stack(task: asyncio.Task,
*,
file: IO = sys.stderr,
limit: int = DEFAULT_MAX_FRAMES,
capture_locals: bool = False) -> None:
"""Print the stack trace for an :class:`asyncio.Task`."""
print(f'Stack for {task!r} (most recent call last):', file=file)
tb = Traceback.from_task(task, limit=limit)
print_list(
StackSummary.extract(
cast(Generator, walk_tb(cast(TracebackType, tb))),
limit=limit,
capture_locals=capture_locals,
),
file=file,
)
def print_coro_stack(coro: Coroutine,
*,
file: IO = sys.stderr,
limit: int = DEFAULT_MAX_FRAMES,
capture_locals: bool = False) -> None:
"""Print the stack trace for a currently running coroutine."""
print(f'Stack for {coro!r} (most recent call last):', file=file)
tb = Traceback.from_coroutine(coro, limit=limit)
print_list(
StackSummary.extract(
cast(Generator, walk_tb(cast(TracebackType, tb))),
limit=limit,
capture_locals=capture_locals,
),
file=file,
)
def print_agen_stack(agen: AsyncGenerator,
*,
file: IO = sys.stderr,
limit: int = DEFAULT_MAX_FRAMES,
capture_locals: bool = False) -> None:
"""Print the stack trace for a currently running async generator."""
print(f'Stack for {agen!r} (most recent call last):', file=file)
tb = Traceback.from_agen(agen, limit=limit)
print_list(
StackSummary.extract(
cast(Generator, walk_tb(cast(TracebackType, tb))),
limit=limit,
capture_locals=capture_locals,
),
file=file,
)
def generate_move_process(generate_move: cu.GenMove, moves_q: mp.Queue):
from traceback import StackSummary
from random import seed as random_seed
import io
from time import time
import pickle
from contextlib import redirect_stderr, redirect_stdout
logger = logging.getLogger(__name__)
f_stderr, f_stdout = io.StringIO(), io.StringIO()
gma: GenMoveArgs = moves_q.get()
np.random.seed(gma.seed)
random_seed(gma.seed)
try:
with redirect_stdout(f_stdout), redirect_stderr(f_stderr):
t0 = time()
returned = generate_move(gma.board, gma.player, gma.state)
saved_state = None
if isinstance(returned, tuple):
action = returned[0]
if len(returned) > 1:
saved_state = returned[1]
else:
action = returned
move_time = time() - t0
stdout, stderr = f_stdout.getvalue(), f_stderr.getvalue()
result = GenMoveSuccess(stdout, stderr, move_time, action, saved_state)
except Exception as e:
logger.exception("An exception was thrown by the agent.")
error_msg = repr(e) + "\n"
extracted_list = traceback.extract_tb(e.__traceback__)
for item in StackSummary.from_list(extracted_list).format():
error_msg += str(item)
stdout, stderr = f_stdout.getvalue(), f_stderr.getvalue()
result = GenMoveFailure(stdout, stderr, error_msg)
try:
moves_q.put(result)
except pickle.PickleError:
logger.exception(
"Internal error in trying to send the result, probably caused by saved_state"
)
moves_q.put(GenMoveSuccess(stdout, stderr, move_time, action, None))
def _exception_handler(loop, context):
''' Last resort exception handler
This will only catch exceptions that happen in the main thread. Others very
well may go entirely unnoticed and unlogged.
Some exceptions are unexpected, so we end up here. For these we kill
ourselves after logging about the exception.
Other exceptions are impossible to catch before we get here. For example, a
client failing the TLS handshake with us. (ugh what the f**k). For these we
notify the state machine so it can react.
'''
# Check for exceptions that should not be fatal and we should tell other
# parts of the code about so they can react intelligently
if 'exception' in context:
exception_type = type(context['exception'])
# Check for recoverable TLS errors
if exception_type == ssl.SSLError:
if 'transport' in context:
machine.notif_sslerror(context['exception'],
context['transport'])
return
else:
log.warn(
'SSLError caught without a transport too. Cannot pass ' +
'to state machine to handle gracefully.')
# Additional recoverable errors would continue here
# All other exceptions. These are fatal
log.error('%s', context['message'])
if 'exception' in context:
log.error('%s %s', type(context['exception']), context['exception'])
if 'handle' in context:
log.error(context['handle'])
if 'source_traceback' in context:
log.error('Traceback:')
summary = StackSummary.from_list(context['source_traceback'])
for line_super in summary.format():
# The above line has multiple lines in it
for line in line_super.split('\n'):
if len(line):
log.error(' %s', line)
else:
log.error(
'Traceback not available. Maybe run with PYTHONASYNCIODEBUG=1')
machine.change_state_fatal_error()
def _exception_handler(loop, context):
log.error('%s', context['message'])
if 'exception' in context:
log.error(context['exception'])
if 'handle' in context:
log.error(context['handle'])
if 'source_traceback' in context:
log.error('Traceback:')
summary = StackSummary.from_list(context['source_traceback'])
for line_super in summary.format():
# The above line has multiple lines in it
for line in line_super.split('\n'):
if len(line):
log.error(' %s', line)
else:
log.error('Traceback not available. Run with PYTHONASYNCIODEBUG=1')
machine.change_state_fatal_error()
def format(self, record) -> str:
# set for different levels
format_orig = self._style._fmt
self._style._fmt = self.msg_fmt[record.levelname]
# preprocess \n
line_count = 0
for s in record.msg:
if s == '\n':
line_count += 1
record.msg = record.msg[1:]
else:
break
if record.msg:
self._style._fmt = line_count * '\n' + self._style._fmt
else:
self._style._fmt = line_count * '\n'
if record.levelno >= self.stack_level and record.levelno != logging.MAIL and record.msg[:
9] != 'Traceback':
record.stack_info = ''.join(
StackSummary.from_list(
extract_stack()
[:self._stack_prune]).format()) # self._stack_prune
# make it colorful
levelname = record.levelname
if self.use_color and levelname in COLORS:
levelname_color = COLOR_SEQ % (
30 + COLORS[levelname]) + record.levelname + RESET_SEQ
record.levelname = levelname_color
self.datefmt = '%m/%d/%Y %I:%M:%S %p'
result = logging.Formatter.format(self, record)
self._style._fmt = format_orig
record.levelname = levelname
return result
def format_exc(name='mlchain', tb=None, exception=None):
if exception is None:
formatted_lines = traceback.format_exc().splitlines()
else:
formatted_lines = []
if tb is not None:
for item in StackSummary.from_list(extract_tb(tb)).format():
str_item = str(item)
if str_item.endswith("\n"):
formatted_lines.append(str_item[:-1])
else:
formatted_lines.append(str_item)
formatted_lines += [
x for x in re.split('(\\\\n)|(\\n)', str(exception))
if x not in ["\\n", "\n", "", None]
]
output = []
kt = True
last_mlchain_append = -1
for x in formatted_lines:
output.append(x)
# if x.strip().startswith("File"):
# if ('site-packages/mlchain' in x or 'site-packages/trio' in x) and not ("mlchain.base.exceptions" in x or "AssertionError" in x):
# kt = False
# else:
# kt = True
# if kt or 'AssertionError' in x or 'mlchain.base.exceptions' in x:
# if x.startswith("'), AssertionError"):
# output.append("\n" + x[4:])
# else:
# output.append(x)
# elif last_mlchain_append != len(output):
# output.append(' File "{}" collapsed errors'.format(name))
# last_mlchain_append = len(output)
return "\n".join(output) + "\n"
def format_exc(name='mlchain', tb=None, exception=None, return_str=True):
if exception is None:
formatted_lines = traceback.format_exc().splitlines()
else:
formatted_lines = []
if tb is not None:
for item in StackSummary.from_list(extract_tb(tb)).format():
str_item = str(item)
if str_item.endswith("\n"):
formatted_lines.append(str_item[:-1])
else:
formatted_lines.append(str_item)
formatted_lines += [
x for x in re.split('(\\\\n)|(\\n)', str(exception))
if x not in ["\\n", "\n", "", None]
]
output = []
for x in formatted_lines:
output.append(x)
if return_str:
return "\n".join(output)
return output
def analyze_frame(trace_back, full_context: int = False) -> str:
"""
Read out variables' content surrounding the error line of code
:param trace_back: A traceback object when exception occur
:param full_context: Also export local variables that is not in the error line
full_context == 0: export only variables that appear on the error line
full_context == 1: export variables within the error function's scope
full_context >= 2: export variables along the function's call stack up to `full_context` level
:return: string of analyzed frame
"""
result = []
full_context = max(0, int(full_context))
# todo: add color
bullet_1 = '|->'
bullet_2 = '=>'
multi_line_indent1 = 8 + len(bullet_1)
multi_line_indent2 = 8 + len(bullet_2)
stack_depth = get_traceback_depth(trace_back)
with logging_disabled():
for idx, obj in enumerate(walk_tb(trace_back)):
frame, _ = obj
global_var = frame.f_globals
local_var = frame.f_locals
summary = StackSummary.extract([obj], capture_locals=True)[0]
line = summary.line
if not is_full_statement(summary.line):
line = get_full_statement(summary.filename, summary.lineno)
line = ' '.join(line)
txt = [
f' File "{summary.filename}", line {summary.lineno}, in {summary.name}',
f' {line}'
]
# todo: dump all level to different file?
parse_level = max(full_context - 1, 0)
if idx + 1 < (stack_depth - parse_level):
# don't parse variables for top levels
txt.append('')
result.append('\n'.join(txt))
continue
# get value of variables on the error line
identifiers = ID_PATTERN.findall(line)
seen = set()
outer = "(outer) " if idx else "" # ground level variables are not outer for sure
for i in identifiers:
if i in seen or i.endswith('.'):
continue
seen.add(i)
spaces = multi_line_indent1 + len(i)
if i in local_var:
value = get_repr(local_var[i], spaces)
txt.append(f' {bullet_1} {i} = {value}')
elif i in global_var:
spaces += len(outer)
value = get_repr(global_var[i], spaces)
txt.append(f' {bullet_1} {outer}{i} = {value}')
elif '.' in i:
# class attribute access
spaces += len(outer)
instance = i.split('.')[0]
obj = local_var.get(instance, global_var.get(instance))
attribute = get_recur_attr(obj, i[len(instance) + 1:])
value = get_repr(attribute, spaces)
scope = outer if instance in global_var else ''
txt.append(f' {bullet_1} {scope}{i} = {value}')
else:
# reserved Keyword or non-identifier, eg. word inside the string
pass
# get value of other variables within local scope
if full_context:
other_local_var = set(local_var) - set(identifiers)
if other_local_var:
spaces = multi_line_indent2
txt.extend([
f' {bullet_2} {k} = {get_repr(v, spaces + len(k))}'
for k, v in local_var.items() if k in other_local_var
])
txt.append('')
result.append('\n'.join(txt))
return '\n'.join(result)
def dump_stack(frames):
stack = StackSummary.from_list(extract_stack(frames))
return [{"filename": f.filename, "lineno": f.lineno, "name": f.name, "line": f.line,
"locals": {name: repr(value) for name, value in sorted(f.locals.items())} if f.locals else None}
for f in stack]
from contextlib import suppress
# External
from async_tools import Loopable
from async_tools.abstract import Loopable as AbstractLoopable
# Project
from ._helper import reject, fulfill, resolve
# Generic types
K = T.TypeVar("K")
L = T.TypeVar("L")
# Fake stacktrace information for use when no stack can be recovered from promise
_FAKE_STACK = list(
StackSummary.from_list([("unknown", 0, "unknown", "invalid")]))
class ChainLink(T.Awaitable[K], Loopable):
@staticmethod
def log_unhandled_exception(promise: "ChainLink[T.Any]",
fut: "Future[T.Any]") -> None:
assert fut.done()
get_loop: T.Callable[[], AbstractEventLoop] = getattr(
fut, "get_loop", None)
loop: AbstractEventLoop = get_loop() if callable(
get_loop) else getattr(fut, "_loop", None)
assert loop is not None
def extract_log_tb(exc=None):
tb = ''.join(StackSummary.extract(walk_tb(sys.exc_info()[-1])).format())
if exc.__cause__ is not None and isinstance(exc.__cause__, Traceback):
tb = exc.__cause__.tb + tb
return tb
def handle_exceptions(err: Exception):
msg = '\n'.join(['', ''.join(StackSummary.from_list(extract_tb(err.__traceback__)).format()), repr(err)])
current_app.logger.error(msg)
return jsonify(code=500, error=repr(err), data=None), 200
def format_tb(tb=None, limit=None, allLocals=None, allGlobals=None, withTitle=False, with_color=None, with_vars=None):
"""
:param types.TracebackType|types.FrameType|StackSummary tb: traceback. if None, will use sys._getframe
:param int|None limit: limit the traceback to this number of frames. by default, will look at sys.tracebacklimit
:param dict[str]|None allLocals: if set, will update it with all locals from all frames
:param dict[str]|None allGlobals: if set, will update it with all globals from all frames
:param bool withTitle:
:param bool|None with_color: output with ANSI escape codes for color
:param bool with_vars: will print var content which are referenced in the source code line. by default enabled.
:return: list of strings (line-based)
:rtype: list[str]
"""
if with_vars is None and is_at_exit():
# Better to not show __repr__ of some vars, as this might lead to crashes
# when native extensions are involved.
with_vars = False
if with_vars is None:
if any([f.f_code.co_name == "__del__" for f in iter_traceback()]):
# __del__ is usually called via the Python garbage collector (GC).
# This can happen and very random / non-deterministic places.
# There are cases where it is not safe to access some of the vars on the stack
# because they might be in a non-well-defined state, thus calling their __repr__ is not safe.
# See e.g. this bug:
# https://github.com/tensorflow/tensorflow/issues/22770
with_vars = False
if with_vars is None:
with_vars = True
color = Color(enable=with_color)
out = []
def output(s1, s2=None, **kwargs):
if kwargs:
s1 = color(s1, **kwargs)
if s2 is not None:
s1 = add_indent_lines(s1, s2)
out.append(s1 + "\n")
def format_filename(s):
base = os.path.basename(s)
return (
color('"' + s[:-len(base)], "cyan") +
color(base, "cyan", bold=True) +
color('"', "cyan"))
def format_py_obj(obj):
return color.py_syntax_highlight(pretty_print(obj))
if tb is None:
try:
tb = get_current_frame()
assert tb
except Exception:
output(color("format_tb: tb is None and sys._getframe() failed", "red", bold=True))
return out
def isstacksummary(_tb):
return isinstance(_tb, StackSummary)
isframe = inspect.isframe
if withTitle:
if isframe(tb) or isstacksummary(tb):
output(color('Traceback (most recent call first):', "blue"))
else: # expect traceback-object (or compatible)
output(color('Traceback (most recent call last):', "blue"))
try:
if limit is None:
if hasattr(sys, 'tracebacklimit'):
limit = sys.tracebacklimit
n = 0
_tb = tb
class NotFound(Exception):
pass
def _resolve_identifier(namespace, id):
if id[0] not in namespace:
raise NotFound()
obj = namespace[id[0]]
for part in id[1:]:
obj = getattr(obj, part)
return obj
def _try_set(old, prefix, func):
if old is not None: return old
try: return add_indent_lines(prefix, func())
except NotFound: return old
except Exception as e:
return prefix + "!" + e.__class__.__name__ + ": " + str(e)
while _tb is not None and (limit is None or n < limit):
if isframe(_tb):
f = _tb
elif isstacksummary(_tb):
if isinstance(_tb[0], ExtendedFrameSummary):
f = _tb[0].tb_frame
else:
f = DummyFrame.from_frame_summary(_tb[0])
else:
f = _tb.tb_frame
if allLocals is not None: allLocals.update(f.f_locals)
if allGlobals is not None: allGlobals.update(f.f_globals)
if hasattr(_tb, "tb_lineno"): lineno = _tb.tb_lineno
elif isstacksummary(_tb): lineno = _tb[0].lineno
else: lineno = f.f_lineno
co = f.f_code
filename = co.co_filename
name = co.co_name
output("".join([
' ',
color("File ", "blue", bold=True), format_filename(filename), ", ",
color("line ", "blue"), color("%d" % lineno, "magenta"), ", ",
color("in ", "blue"), name]))
if not os.path.isfile(filename):
altfn = fallback_findfile(filename)
if altfn:
output(color(" -- couldn't find file, trying this instead: ", "blue") +
format_filename(altfn))
filename = altfn
source_code = get_source_code(filename, lineno, f.f_globals)
if source_code:
source_code = remove_indent_lines(replace_tab_indents(source_code)).rstrip()
output(" line: ", color.py_syntax_highlight(source_code), color="blue")
if not with_vars:
pass
elif isinstance(f, DummyFrame) and not f.have_vars_available:
pass
else:
output(color(' locals:', "blue"))
alreadyPrintedLocals = set()
for tokenstr in grep_full_py_identifiers(parse_py_statement(source_code)):
splittedtoken = tuple(tokenstr.split("."))
for token in [splittedtoken[0:i] for i in range(1, len(splittedtoken) + 1)]:
if token in alreadyPrintedLocals: continue
tokenvalue = None
tokenvalue = _try_set(tokenvalue, color("<local> ", "blue"), lambda: format_py_obj(_resolve_identifier(f.f_locals, token)))
tokenvalue = _try_set(tokenvalue, color("<global> ", "blue"), lambda: format_py_obj(_resolve_identifier(f.f_globals, token)))
tokenvalue = _try_set(tokenvalue, color("<builtin> ", "blue"), lambda: format_py_obj(_resolve_identifier(f.f_builtins, token)))
tokenvalue = tokenvalue or color("<not found>", "blue")
prefix = ' %s ' % color(".", "blue", bold=True).join(token) + color("= ", "blue", bold=True)
output(prefix, tokenvalue)
alreadyPrintedLocals.add(token)
if len(alreadyPrintedLocals) == 0:
output(color(" no locals", "blue"))
else:
output(color(' -- code not available --', "blue"))
if isframe(_tb):
_tb = _tb.f_back
elif isstacksummary(_tb):
_tb = StackSummary.from_list(_tb[1:])
if not _tb:
_tb = None
else:
_tb = _tb.tb_next
n += 1
except Exception as e:
output(color("ERROR: cannot get more detailed exception info because:", "red", bold=True))
import traceback
for l in traceback.format_exc().split("\n"):
output(" " + l)
return out