from __future__ import absolute_import, division, print_function
import inspect
import pprint
import sys
import traceback
from inspect import CO_VARARGS, CO_VARKEYWORDS
import attr
import re
from weakref import ref
from _pytest.compat import _PY2, _PY3, PY35, safe_str
from six import text_type
import py
import six
builtin_repr = repr
if _PY3:
from traceback import format_exception_only
else:
from ._py2traceback import format_exception_only
class Code(object):
""" wrapper around Python code objects """
def __init__(self, rawcode):
if not hasattr(rawcode, "co_filename"):
rawcode = getrawcode(rawcode)
try:
self.filename = rawcode.co_filename
self.firstlineno = rawcode.co_firstlineno - 1
self.name = rawcode.co_name
except AttributeError:
raise TypeError("not a code object: %r" % (rawcode,))
self.raw = rawcode
def __eq__(self, other):
return self.raw == other.raw
__hash__ = None
def __ne__(self, other):
return not self == other
@property
def path(self):
""" return a path object pointing to source code (note that it
might not point to an actually existing file). """
try:
p = py.path.local(self.raw.co_filename)
# maybe don't try this checking
if not p.check():
raise OSError("py.path check failed.")
except OSError:
# XXX maybe try harder like the weird logic
# in the standard lib [linecache.updatecache] does?
p = self.raw.co_filename
return p
@property
def fullsource(self):
""" return a _pytest._code.Source object for the full source file of the code
"""
from _pytest._code import source
full, _ = source.findsource(self.raw)
return full
def source(self):
""" return a _pytest._code.Source object for the code object's source only
"""
# return source only for that part of code
import _pytest._code
return _pytest._code.Source(self.raw)
def getargs(self, var=False):
""" return a tuple with the argument names for the code object
if 'var' is set True also return the names of the variable and
keyword arguments when present
"""
# handfull shortcut for getting args
raw = self.raw
argcount = raw.co_argcount
if var:
argcount += raw.co_flags & CO_VARARGS
argcount += raw.co_flags & CO_VARKEYWORDS
return raw.co_varnames[:argcount]
class Frame(object):
"""Wrapper around a Python frame holding f_locals and f_globals
in which expressions can be evaluated."""
def __init__(self, frame):
self.lineno = frame.f_lineno - 1
self.f_globals = frame.f_globals
self.f_locals = frame.f_locals
self.raw = frame
self.code = Code(frame.f_code)
@property
def statement(self):
""" statement this frame is at """
import _pytest._code
if self.code.fullsource is None:
return _pytest._code.Source("")
return self.code.fullsource.getstatement(self.lineno)
def eval(self, code, **vars):
""" evaluate 'code' in the frame
'vars' are optional additional local variables
returns the result of the evaluation
"""
f_locals = self.f_locals.copy()
f_locals.update(vars)
return eval(code, self.f_globals, f_locals)
def exec_(self, code, **vars):
""" exec 'code' in the frame
'vars' are optiona; additional local variables
"""
f_locals = self.f_locals.copy()
f_locals.update(vars)
six.exec_(code, self.f_globals, f_locals)
def repr(self, object):
""" return a 'safe' (non-recursive, one-line) string repr for 'object'
"""
return py.io.saferepr(object)
def is_true(self, object):
return object
def getargs(self, var=False):
""" return a list of tuples (name, value) for all arguments
if 'var' is set True also include the variable and keyword
arguments when present
"""
retval = []
for arg in self.code.getargs(var):
try:
retval.append((arg, self.f_locals[arg]))
except KeyError:
pass # this can occur when using Psyco
return retval
class TracebackEntry(object):
""" a single entry in a traceback """
_repr_style = None
exprinfo = None
def __init__(self, rawentry, excinfo=None):
self._excinfo = excinfo
self._rawentry = rawentry
self.lineno = rawentry.tb_lineno - 1
def set_repr_style(self, mode):
assert mode in ("short", "long")
self._repr_style = mode
@property
def frame(self):
import _pytest._code
return _pytest._code.Frame(self._rawentry.tb_frame)
@property
def relline(self):
return self.lineno - self.frame.code.firstlineno
def __repr__(self):
return "<TracebackEntry %s:%d>" % (self.frame.code.path, self.lineno + 1)
@property
def statement(self):
""" _pytest._code.Source object for the current statement """
source = self.frame.code.fullsource
return source.getstatement(self.lineno)
@property
def path(self):
""" path to the source code """
return self.frame.code.path
def getlocals(self):
return self.frame.f_locals
locals = property(getlocals, None, None, "locals of underlaying frame")
def getfirstlinesource(self):
# on Jython this firstlineno can be -1 apparently
return max(self.frame.code.firstlineno, 0)
def getsource(self, astcache=None):
""" return failing source code. """
# we use the passed in astcache to not reparse asttrees
# within exception info printing
from _pytest._code.source import getstatementrange_ast
source = self.frame.code.fullsource
if source is None:
return None
key = astnode = None
if astcache is not None:
key = self.frame.code.path
if key is not None:
astnode = astcache.get(key, None)
start = self.getfirstlinesource()
try:
astnode, _, end = getstatementrange_ast(
self.lineno, source, astnode=astnode
)
except SyntaxError:
end = self.lineno + 1
else:
if key is not None:
astcache[key] = astnode
return source[start:end]
source = property(getsource)
def ishidden(self):
""" return True if the current frame has a var __tracebackhide__
resolving to True
If __tracebackhide__ is a callable, it gets called with the
ExceptionInfo instance and can decide whether to hide the traceback.
mostly for internal use
"""
try:
tbh = self.frame.f_locals["__tracebackhide__"]
except KeyError:
try:
tbh = self.frame.f_globals["__tracebackhide__"]
except KeyError:
return False
if callable(tbh):
return tbh(None if self._excinfo is None else self._excinfo())
else:
return tbh
def __str__(self):
try:
fn = str(self.path)
except py.error.Error:
fn = "???"
name = self.frame.code.name
try:
line = str(self.statement).lstrip()
except KeyboardInterrupt:
raise
except: # noqa
line = "???"
return " File %r:%d in %s\n %s\n" % (fn, self.lineno + 1, name, line)
def name(self):
return self.frame.code.raw.co_name
name = property(name, None, None, "co_name of underlaying code")
class Traceback(list):
""" Traceback objects encapsulate and offer higher level
access to Traceback entries.
"""
Entry = TracebackEntry
def __init__(self, tb, excinfo=None):
""" initialize from given python traceback object and ExceptionInfo """
self._excinfo = excinfo
if hasattr(tb, "tb_next"):
def f(cur):
while cur is not None:
yield self.Entry(cur, excinfo=excinfo)
cur = cur.tb_next
list.__init__(self, f(tb))
else:
list.__init__(self, tb)
def cut(self, path=None, lineno=None, firstlineno=None, excludepath=None):
""" return a Traceback instance wrapping part of this Traceback
by provding any combination of path, lineno and firstlineno, the
first frame to start the to-be-returned traceback is determined
this allows cutting the first part of a Traceback instance e.g.
for formatting reasons (removing some uninteresting bits that deal
with handling of the exception/traceback)
"""
for x in self:
code = x.frame.code
codepath = code.path
if (
(path is None or codepath == path)
and (
excludepath is None
or not hasattr(codepath, "relto")
or not codepath.relto(excludepath)
)
and (lineno is None or x.lineno == lineno)
and (firstlineno is None or x.frame.code.firstlineno == firstlineno)
):
return Traceback(x._rawentry, self._excinfo)
return self
def __getitem__(self, key):
val = super(Traceback, self).__getitem__(key)
if isinstance(key, type(slice(0))):
val = self.__class__(val)
return val
def filter(self, fn=lambda x: not x.ishidden()):
""" return a Traceback instance with certain items removed
fn is a function that gets a single argument, a TracebackEntry
instance, and should return True when the item should be added
to the Traceback, False when not
by default this removes all the TracebackEntries which are hidden
(see ishidden() above)
"""
return Traceback(filter(fn, self), self._excinfo)
def getcrashentry(self):
""" return last non-hidden traceback entry that lead
to the exception of a traceback.
"""
for i in range(-1, -len(self) - 1, -1):
entry = self[i]
if not entry.ishidden():
return entry
return self[-1]
def recursionindex(self):
""" return the index of the frame/TracebackEntry where recursion
originates if appropriate, None if no recursion occurred
"""
cache = {}
for i, entry in enumerate(self):
# id for the code.raw is needed to work around
# the strange metaprogramming in the decorator lib from pypi
# which generates code objects that have hash/value equality
# XXX needs a test
key = entry.frame.code.path, id(entry.frame.code.raw), entry.lineno
# print "checking for recursion at", key
values = cache.setdefault(key, [])
if values:
f = entry.frame
loc = f.f_locals
for otherloc in values:
if f.is_true(
f.eval(
co_equal,
__recursioncache_locals_1=loc,
__recursioncache_locals_2=otherloc,
)
):
return i
values.append(entry.frame.f_locals)
return None
co_equal = compile(
"__recursioncache_locals_1 == __recursioncache_locals_2", "?", "eval"
)
[docs]class ExceptionInfo(object):
""" wraps sys.exc_info() objects and offers
help for navigating the traceback.
"""
_striptext = ""
_assert_start_repr = (
"AssertionError(u'assert " if _PY2 else "AssertionError('assert "
)
def __init__(self, tup=None, exprinfo=None):
import _pytest._code
if tup is None:
tup = sys.exc_info()
if exprinfo is None and isinstance(tup[1], AssertionError):
exprinfo = getattr(tup[1], "msg", None)
if exprinfo is None:
exprinfo = py.io.saferepr(tup[1])
if exprinfo and exprinfo.startswith(self._assert_start_repr):
self._striptext = "AssertionError: "
self._excinfo = tup
#: the exception class
self.type = tup[0]
#: the exception instance
self.value = tup[1]
#: the exception raw traceback
self.tb = tup[2]
#: the exception type name
self.typename = self.type.__name__
#: the exception traceback (_pytest._code.Traceback instance)
self.traceback = _pytest._code.Traceback(self.tb, excinfo=ref(self))
def __repr__(self):
return "<ExceptionInfo %s tblen=%d>" % (self.typename, len(self.traceback))
[docs] def exconly(self, tryshort=False):
""" return the exception as a string
when 'tryshort' resolves to True, and the exception is a
_pytest._code._AssertionError, only the actual exception part of
the exception representation is returned (so 'AssertionError: ' is
removed from the beginning)
"""
lines = format_exception_only(self.type, self.value)
text = "".join(lines)
text = text.rstrip()
if tryshort:
if text.startswith(self._striptext):
text = text[len(self._striptext) :]
return text
[docs] def errisinstance(self, exc):
""" return True if the exception is an instance of exc """
return isinstance(self.value, exc)
def _getreprcrash(self):
exconly = self.exconly(tryshort=True)
entry = self.traceback.getcrashentry()
path, lineno = entry.frame.code.raw.co_filename, entry.lineno
return ReprFileLocation(path, lineno + 1, exconly)
[docs] def getrepr(
self,
showlocals=False,
style="long",
abspath=False,
tbfilter=True,
funcargs=False,
truncate_locals=True,
):
""" return str()able representation of this exception info.
showlocals: show locals per traceback entry
style: long|short|no|native traceback style
tbfilter: hide entries (where __tracebackhide__ is true)
in case of style==native, tbfilter and showlocals is ignored.
"""
if style == "native":
return ReprExceptionInfo(
ReprTracebackNative(
traceback.format_exception(
self.type, self.value, self.traceback[0]._rawentry
)
),
self._getreprcrash(),
)
fmt = FormattedExcinfo(
showlocals=showlocals,
style=style,
abspath=abspath,
tbfilter=tbfilter,
funcargs=funcargs,
truncate_locals=truncate_locals,
)
return fmt.repr_excinfo(self)
def __str__(self):
entry = self.traceback[-1]
loc = ReprFileLocation(entry.path, entry.lineno + 1, self.exconly())
return str(loc)
def __unicode__(self):
entry = self.traceback[-1]
loc = ReprFileLocation(entry.path, entry.lineno + 1, self.exconly())
return text_type(loc)
[docs] def match(self, regexp):
"""
Match the regular expression 'regexp' on the string representation of
the exception. If it matches then True is returned (so that it is
possible to write 'assert excinfo.match()'). If it doesn't match an
AssertionError is raised.
"""
__tracebackhide__ = True
if not re.search(regexp, str(self.value)):
assert 0, "Pattern '{!s}' not found in '{!s}'".format(regexp, self.value)
return True
@attr.s
class FormattedExcinfo(object):
""" presenting information about failing Functions and Generators. """
# for traceback entries
flow_marker = ">"
fail_marker = "E"
showlocals = attr.ib(default=False)
style = attr.ib(default="long")
abspath = attr.ib(default=True)
tbfilter = attr.ib(default=True)
funcargs = attr.ib(default=False)
truncate_locals = attr.ib(default=True)
astcache = attr.ib(default=attr.Factory(dict), init=False, repr=False)
def _getindent(self, source):
# figure out indent for given source
try:
s = str(source.getstatement(len(source) - 1))
except KeyboardInterrupt:
raise
except: # noqa
try:
s = str(source[-1])
except KeyboardInterrupt:
raise
except: # noqa
return 0
return 4 + (len(s) - len(s.lstrip()))
def _getentrysource(self, entry):
source = entry.getsource(self.astcache)
if source is not None:
source = source.deindent()
return source
def _saferepr(self, obj):
return py.io.saferepr(obj)
def repr_args(self, entry):
if self.funcargs:
args = []
for argname, argvalue in entry.frame.getargs(var=True):
args.append((argname, self._saferepr(argvalue)))
return ReprFuncArgs(args)
def get_source(self, source, line_index=-1, excinfo=None, short=False):
""" return formatted and marked up source lines. """
import _pytest._code
lines = []
if source is None or line_index >= len(source.lines):
source = _pytest._code.Source("???")
line_index = 0
if line_index < 0:
line_index += len(source)
space_prefix = " "
if short:
lines.append(space_prefix + source.lines[line_index].strip())
else:
for line in source.lines[:line_index]:
lines.append(space_prefix + line)
lines.append(self.flow_marker + " " + source.lines[line_index])
for line in source.lines[line_index + 1 :]:
lines.append(space_prefix + line)
if excinfo is not None:
indent = 4 if short else self._getindent(source)
lines.extend(self.get_exconly(excinfo, indent=indent, markall=True))
return lines
def get_exconly(self, excinfo, indent=4, markall=False):
lines = []
indent = " " * indent
# get the real exception information out
exlines = excinfo.exconly(tryshort=True).split("\n")
failindent = self.fail_marker + indent[1:]
for line in exlines:
lines.append(failindent + line)
if not markall:
failindent = indent
return lines
def repr_locals(self, locals):
if self.showlocals:
lines = []
keys = [loc for loc in locals if loc[0] != "@"]
keys.sort()
for name in keys:
value = locals[name]
if name == "__builtins__":
lines.append("__builtins__ = <builtins>")
else:
# This formatting could all be handled by the
# _repr() function, which is only reprlib.Repr in
# disguise, so is very configurable.
if self.truncate_locals:
str_repr = self._saferepr(value)
else:
str_repr = pprint.pformat(value)
# if len(str_repr) < 70 or not isinstance(value,
# (list, tuple, dict)):
lines.append("%-10s = %s" % (name, str_repr))
# else:
# self._line("%-10s =\\" % (name,))
# # XXX
# pprint.pprint(value, stream=self.excinfowriter)
return ReprLocals(lines)
def repr_traceback_entry(self, entry, excinfo=None):
import _pytest._code
source = self._getentrysource(entry)
if source is None:
source = _pytest._code.Source("???")
line_index = 0
else:
# entry.getfirstlinesource() can be -1, should be 0 on jython
line_index = entry.lineno - max(entry.getfirstlinesource(), 0)
lines = []
style = entry._repr_style
if style is None:
style = self.style
if style in ("short", "long"):
short = style == "short"
reprargs = self.repr_args(entry) if not short else None
s = self.get_source(source, line_index, excinfo, short=short)
lines.extend(s)
if short:
message = "in %s" % (entry.name)
else:
message = excinfo and excinfo.typename or ""
path = self._makepath(entry.path)
filelocrepr = ReprFileLocation(path, entry.lineno + 1, message)
localsrepr = None
if not short:
localsrepr = self.repr_locals(entry.locals)
return ReprEntry(lines, reprargs, localsrepr, filelocrepr, style)
if excinfo:
lines.extend(self.get_exconly(excinfo, indent=4))
return ReprEntry(lines, None, None, None, style)
def _makepath(self, path):
if not self.abspath:
try:
np = py.path.local().bestrelpath(path)
except OSError:
return path
if len(np) < len(str(path)):
path = np
return path
def repr_traceback(self, excinfo):
traceback = excinfo.traceback
if self.tbfilter:
traceback = traceback.filter()
if is_recursion_error(excinfo):
traceback, extraline = self._truncate_recursive_traceback(traceback)
else:
extraline = None
last = traceback[-1]
entries = []
for index, entry in enumerate(traceback):
einfo = (last == entry) and excinfo or None
reprentry = self.repr_traceback_entry(entry, einfo)
entries.append(reprentry)
return ReprTraceback(entries, extraline, style=self.style)
def _truncate_recursive_traceback(self, traceback):
"""
Truncate the given recursive traceback trying to find the starting point
of the recursion.
The detection is done by going through each traceback entry and finding the
point in which the locals of the frame are equal to the locals of a previous frame (see ``recursionindex()``.
Handle the situation where the recursion process might raise an exception (for example
comparing numpy arrays using equality raises a TypeError), in which case we do our best to
warn the user of the error and show a limited traceback.
"""
try:
recursionindex = traceback.recursionindex()
except Exception as e:
max_frames = 10
extraline = (
"!!! Recursion error detected, but an error occurred locating the origin of recursion.\n"
" The following exception happened when comparing locals in the stack frame:\n"
" {exc_type}: {exc_msg}\n"
" Displaying first and last {max_frames} stack frames out of {total}."
).format(
exc_type=type(e).__name__,
exc_msg=safe_str(e),
max_frames=max_frames,
total=len(traceback),
)
traceback = traceback[:max_frames] + traceback[-max_frames:]
else:
if recursionindex is not None:
extraline = "!!! Recursion detected (same locals & position)"
traceback = traceback[: recursionindex + 1]
else:
extraline = None
return traceback, extraline
def repr_excinfo(self, excinfo):
if _PY2:
reprtraceback = self.repr_traceback(excinfo)
reprcrash = excinfo._getreprcrash()
return ReprExceptionInfo(reprtraceback, reprcrash)
else:
repr_chain = []
e = excinfo.value
descr = None
seen = set()
while e is not None and id(e) not in seen:
seen.add(id(e))
if excinfo:
reprtraceback = self.repr_traceback(excinfo)
reprcrash = excinfo._getreprcrash()
else:
# fallback to native repr if the exception doesn't have a traceback:
# ExceptionInfo objects require a full traceback to work
reprtraceback = ReprTracebackNative(
traceback.format_exception(type(e), e, None)
)
reprcrash = None
repr_chain += [(reprtraceback, reprcrash, descr)]
if e.__cause__ is not None:
e = e.__cause__
excinfo = (
ExceptionInfo((type(e), e, e.__traceback__))
if e.__traceback__
else None
)
descr = "The above exception was the direct cause of the following exception:"
elif e.__context__ is not None and not e.__suppress_context__:
e = e.__context__
excinfo = (
ExceptionInfo((type(e), e, e.__traceback__))
if e.__traceback__
else None
)
descr = "During handling of the above exception, another exception occurred:"
else:
e = None
repr_chain.reverse()
return ExceptionChainRepr(repr_chain)
class TerminalRepr(object):
def __str__(self):
s = self.__unicode__()
if _PY2:
s = s.encode("utf-8")
return s
def __unicode__(self):
# FYI this is called from pytest-xdist's serialization of exception
# information.
io = py.io.TextIO()
tw = py.io.TerminalWriter(file=io)
self.toterminal(tw)
return io.getvalue().strip()
def __repr__(self):
return "<%s instance at %0x>" % (self.__class__, id(self))
class ExceptionRepr(TerminalRepr):
def __init__(self):
self.sections = []
def addsection(self, name, content, sep="-"):
self.sections.append((name, content, sep))
def toterminal(self, tw):
for name, content, sep in self.sections:
tw.sep(sep, name)
tw.line(content)
class ExceptionChainRepr(ExceptionRepr):
def __init__(self, chain):
super(ExceptionChainRepr, self).__init__()
self.chain = chain
# reprcrash and reprtraceback of the outermost (the newest) exception
# in the chain
self.reprtraceback = chain[-1][0]
self.reprcrash = chain[-1][1]
def toterminal(self, tw):
for element in self.chain:
element[0].toterminal(tw)
if element[2] is not None:
tw.line("")
tw.line(element[2], yellow=True)
super(ExceptionChainRepr, self).toterminal(tw)
class ReprExceptionInfo(ExceptionRepr):
def __init__(self, reprtraceback, reprcrash):
super(ReprExceptionInfo, self).__init__()
self.reprtraceback = reprtraceback
self.reprcrash = reprcrash
def toterminal(self, tw):
self.reprtraceback.toterminal(tw)
super(ReprExceptionInfo, self).toterminal(tw)
class ReprTraceback(TerminalRepr):
entrysep = "_ "
def __init__(self, reprentries, extraline, style):
self.reprentries = reprentries
self.extraline = extraline
self.style = style
def toterminal(self, tw):
# the entries might have different styles
for i, entry in enumerate(self.reprentries):
if entry.style == "long":
tw.line("")
entry.toterminal(tw)
if i < len(self.reprentries) - 1:
next_entry = self.reprentries[i + 1]
if (
entry.style == "long"
or entry.style == "short"
and next_entry.style == "long"
):
tw.sep(self.entrysep)
if self.extraline:
tw.line(self.extraline)
class ReprTracebackNative(ReprTraceback):
def __init__(self, tblines):
self.style = "native"
self.reprentries = [ReprEntryNative(tblines)]
self.extraline = None
class ReprEntryNative(TerminalRepr):
style = "native"
def __init__(self, tblines):
self.lines = tblines
def toterminal(self, tw):
tw.write("".join(self.lines))
class ReprEntry(TerminalRepr):
localssep = "_ "
def __init__(self, lines, reprfuncargs, reprlocals, filelocrepr, style):
self.lines = lines
self.reprfuncargs = reprfuncargs
self.reprlocals = reprlocals
self.reprfileloc = filelocrepr
self.style = style
def toterminal(self, tw):
if self.style == "short":
self.reprfileloc.toterminal(tw)
for line in self.lines:
red = line.startswith("E ")
tw.line(line, bold=True, red=red)
# tw.line("")
return
if self.reprfuncargs:
self.reprfuncargs.toterminal(tw)
for line in self.lines:
red = line.startswith("E ")
tw.line(line, bold=True, red=red)
if self.reprlocals:
# tw.sep(self.localssep, "Locals")
tw.line("")
self.reprlocals.toterminal(tw)
if self.reprfileloc:
if self.lines:
tw.line("")
self.reprfileloc.toterminal(tw)
def __str__(self):
return "%s\n%s\n%s" % ("\n".join(self.lines), self.reprlocals, self.reprfileloc)
class ReprFileLocation(TerminalRepr):
def __init__(self, path, lineno, message):
self.path = str(path)
self.lineno = lineno
self.message = message
def toterminal(self, tw):
# filename and lineno output for each entry,
# using an output format that most editors unterstand
msg = self.message
i = msg.find("\n")
if i != -1:
msg = msg[:i]
tw.write(self.path, bold=True, red=True)
tw.line(":%s: %s" % (self.lineno, msg))
class ReprLocals(TerminalRepr):
def __init__(self, lines):
self.lines = lines
def toterminal(self, tw):
for line in self.lines:
tw.line(line)
class ReprFuncArgs(TerminalRepr):
def __init__(self, args):
self.args = args
def toterminal(self, tw):
if self.args:
linesofar = ""
for name, value in self.args:
ns = "%s = %s" % (safe_str(name), safe_str(value))
if len(ns) + len(linesofar) + 2 > tw.fullwidth:
if linesofar:
tw.line(linesofar)
linesofar = ns
else:
if linesofar:
linesofar += ", " + ns
else:
linesofar = ns
if linesofar:
tw.line(linesofar)
tw.line("")
def getrawcode(obj, trycall=True):
""" return code object for given function. """
try:
return obj.__code__
except AttributeError:
obj = getattr(obj, "im_func", obj)
obj = getattr(obj, "func_code", obj)
obj = getattr(obj, "f_code", obj)
obj = getattr(obj, "__code__", obj)
if trycall and not hasattr(obj, "co_firstlineno"):
if hasattr(obj, "__call__") and not inspect.isclass(obj):
x = getrawcode(obj.__call__, trycall=False)
if hasattr(x, "co_firstlineno"):
return x
return obj
if PY35: # RecursionError introduced in 3.5
def is_recursion_error(excinfo):
return excinfo.errisinstance(RecursionError) # noqa
else:
def is_recursion_error(excinfo):
if not excinfo.errisinstance(RuntimeError):
return False
try:
return "maximum recursion depth exceeded" in str(excinfo.value)
except UnicodeError:
return False