def verifyStderr(self, method, successRe) :
"""
Call method() while capturing sys.stderr output internally and
call self.fail() if successRe.search() does not match the stderr
output. This is used to test for uncatchable exceptions.
"""
stdErr = sys.stderr
sys.stderr = StringIO()
try:
method()
finally:
temp = sys.stderr
sys.stderr = stdErr
errorOut = temp.getvalue()
if not successRe.search(errorOut) :
self.fail("unexpected stderr output:\n"+errorOut)
if sys.version_info < (3, 0) : # XXX: How to do this in Py3k ???
sys.exc_traceback = sys.last_traceback = None
python类last_traceback()的实例源码
def showtraceback(self):
"""Display the exception that just occurred.
We remove the first stack item because it is our own code.
The output is written by self.write(), below.
"""
try:
type, value, tb = sys.exc_info()
sys.last_type = type
sys.last_value = value
sys.last_traceback = tb
tblist = traceback.extract_tb(tb)
del tblist[:1]
list = traceback.format_list(tblist)
if list:
list.insert(0, "Traceback (most recent call last):\n")
list[len(list):] = traceback.format_exception_only(type, value)
finally:
tblist = tb = None
map(self.write, list)
def showtraceback(self):
"""Display the exception that just occurred.
We remove the first stack item because it is our own code.
The output is written by self.write(), below.
"""
try:
type, value, tb = sys.exc_info()
sys.last_type = type
sys.last_value = value
sys.last_traceback = tb
tblist = traceback.extract_tb(tb)
del tblist[:1]
list = traceback.format_list(tblist)
if list:
list.insert(0, "Traceback (most recent call last):\n")
list[len(list):] = traceback.format_exception_only(type, value)
finally:
tblist = tb = None
map(self.write, list)
def showtraceback(self):
"""Display the exception that just occurred.
We remove the first stack item because it is our own code.
The output is written by self.write(), below.
"""
try:
type, value, tb = sys.exc_info()
sys.last_type = type
sys.last_value = value
sys.last_traceback = tb
tblist = traceback.extract_tb(tb)
del tblist[:1]
list = traceback.format_list(tblist)
if list:
list.insert(0, "Traceback (most recent call last):\n")
list[len(list):] = traceback.format_exception_only(type, value)
finally:
tblist = tb = None
map(self.write, list)
def debugger(self,force=False):
"""Call the pdb debugger.
Keywords:
- force(False): by default, this routine checks the instance call_pdb
flag and does not actually invoke the debugger if the flag is false.
The 'force' option forces the debugger to activate even if the flag
is false.
"""
if not (force or self.call_pdb):
return
if not hasattr(sys,'last_traceback'):
error('No traceback has been produced, nothing to debug.')
return
self.InteractiveTB.debugger(force=True)
#-------------------------------------------------------------------------
# Things related to IPython's various namespaces
#-------------------------------------------------------------------------
def print_exception():
import linecache
linecache.checkcache()
flush_stdout()
efile = sys.stderr
typ, val, tb = excinfo = sys.exc_info()
sys.last_type, sys.last_value, sys.last_traceback = excinfo
tbe = traceback.extract_tb(tb)
print('Traceback (most recent call last):', file=efile)
exclude = ("run.py", "rpc.py", "threading.py", "queue.py",
"RemoteDebugger.py", "bdb.py")
cleanup_traceback(tbe, exclude)
traceback.print_list(tbe, file=efile)
lines = traceback.format_exception_only(typ, val)
for line in lines:
print(line, end='', file=efile)
def verifyStderr(self, method, successRe) :
"""
Call method() while capturing sys.stderr output internally and
call self.fail() if successRe.search() does not match the stderr
output. This is used to test for uncatchable exceptions.
"""
stdErr = sys.stderr
sys.stderr = StringIO()
try:
method()
finally:
temp = sys.stderr
sys.stderr = stdErr
errorOut = temp.getvalue()
if not successRe.search(errorOut) :
self.fail("unexpected stderr output:\n"+errorOut)
if sys.version_info < (3, 0) : # XXX: How to do this in Py3k ???
sys.exc_traceback = sys.last_traceback = None
def showtraceback(self):
"""Display the exception that just occurred.
We remove the first stack item because it is our own code.
The output is written by self.write(), below.
"""
try:
type, value, tb = sys.exc_info()
sys.last_type = type
sys.last_value = value
sys.last_traceback = tb
tblist = traceback.extract_tb(tb)
del tblist[:1]
list = traceback.format_list(tblist)
if list:
list.insert(0, "Traceback (most recent call last):\n")
list[len(list):] = traceback.format_exception_only(type, value)
finally:
tblist = tb = None
map(self.write, list)
def _stack_viewer(parent): # htest #
root = tk.Tk()
root.title("Test StackViewer")
width, height, x, y = list(map(int, re.split('[x+]', parent.geometry())))
root.geometry("+%d+%d"%(x, y + 150))
flist = PyShellFileList(root)
try: # to obtain a traceback object
intentional_name_error
except NameError:
exc_type, exc_value, exc_tb = sys.exc_info()
# inject stack trace to sys
sys.last_type = exc_type
sys.last_value = exc_value
sys.last_traceback = exc_tb
StackBrowser(root, flist=flist, top=root, tb=exc_tb)
# restore sys to original state
del sys.last_type
del sys.last_value
del sys.last_traceback
def verifyStderr(self, method, successRe) :
"""
Call method() while capturing sys.stderr output internally and
call self.fail() if successRe.search() does not match the stderr
output. This is used to test for uncatchable exceptions.
"""
stdErr = sys.stderr
sys.stderr = StringIO()
try:
method()
finally:
temp = sys.stderr
sys.stderr = stdErr
errorOut = temp.getvalue()
if not successRe.search(errorOut) :
self.fail("unexpected stderr output:\n"+errorOut)
if sys.version_info < (3, 0) : # XXX: How to do this in Py3k ???
sys.exc_traceback = sys.last_traceback = None
def showtraceback(self):
"""Display the exception that just occurred.
We remove the first stack item because it is our own code.
The output is written by self.write(), below.
"""
try:
type, value, tb = sys.exc_info()
sys.last_type = type
sys.last_value = value
sys.last_traceback = tb
tblist = traceback.extract_tb(tb)
del tblist[:1]
list = traceback.format_list(tblist)
if list:
list.insert(0, "Traceback (most recent call last):\n")
list[len(list):] = traceback.format_exception_only(type, value)
finally:
tblist = tb = None
map(self.write, list)
def _stack_viewer(parent): # htest #
root = tk.Tk()
root.title("Test StackViewer")
width, height, x, y = list(map(int, re.split('[x+]', parent.geometry())))
root.geometry("+%d+%d"%(x, y + 150))
flist = PyShellFileList(root)
try: # to obtain a traceback object
intentional_name_error
except NameError:
exc_type, exc_value, exc_tb = sys.exc_info()
# inject stack trace to sys
sys.last_type = exc_type
sys.last_value = exc_value
sys.last_traceback = exc_tb
StackBrowser(root, flist=flist, top=root, tb=exc_tb)
# restore sys to original state
del sys.last_type
del sys.last_value
del sys.last_traceback
def verifyStderr(self, method, successRe) :
"""
Call method() while capturing sys.stderr output internally and
call self.fail() if successRe.search() does not match the stderr
output. This is used to test for uncatchable exceptions.
"""
stdErr = sys.stderr
sys.stderr = StringIO()
try:
method()
finally:
temp = sys.stderr
sys.stderr = stdErr
errorOut = temp.getvalue()
if not successRe.search(errorOut) :
self.fail("unexpected stderr output:\n"+errorOut)
if sys.version_info < (3, 0) : # XXX: How to do this in Py3k ???
sys.exc_traceback = sys.last_traceback = None
def showtraceback(self):
"""Display the exception that just occurred.
We remove the first stack item because it is our own code.
The output is written by self.write(), below.
"""
try:
type, value, tb = sys.exc_info()
sys.last_type = type
sys.last_value = value
sys.last_traceback = tb
tblist = traceback.extract_tb(tb)
del tblist[:1]
list = traceback.format_list(tblist)
if list:
list.insert(0, "Traceback (most recent call last):\n")
list[len(list):] = traceback.format_exception_only(type, value)
finally:
tblist = tb = None
map(self.write, list)
def step_impl(context):
"""
:type context behave.runner.Context
"""
_json_data = json_load_file(os.path.join(script_location, "../data/bad_json.json"))
try:
context.schema_tools.apply(_json_data)
except Exception as e:
if str(e)[:32] == "'canRead' is a required property":
ok_(True)
else:
if hasattr(sys, "last_traceback"):
_traceback = traceback.print_tb(sys.last_traceback)
else:
_traceback = "Not available"
ok_(False, "Error: " + str(e) + "\nTraceback:" + _traceback)
def showtraceback(self):
"""Display the exception that just occurred.
We remove the first stack item because it is our own code.
The output is written by self.write(), below.
"""
try:
type, value, tb = sys.exc_info()
sys.last_type = type
sys.last_value = value
sys.last_traceback = tb
tblist = traceback.extract_tb(tb)
del tblist[:1]
list = traceback.format_list(tblist)
if list:
list.insert(0, "Traceback (most recent call last):\n")
list[len(list):] = traceback.format_exception_only(type, value)
finally:
tblist = tb = None
map(self.write, list)
def showsyntaxerror(self, filename=None):
"""Display the syntax error that just occurred."""
#Override for avoid using sys.excepthook PY-12600
type, value, tb = sys.exc_info()
sys.last_type = type
sys.last_value = value
sys.last_traceback = tb
if filename and type is SyntaxError:
# Work hard to stuff the correct filename in the exception
try:
msg, (dummy_filename, lineno, offset, line) = value.args
except ValueError:
# Not the format we expect; leave it alone
pass
else:
# Stuff in the right filename
value = SyntaxError(msg, (filename, lineno, offset, line))
sys.last_value = value
list = traceback.format_exception_only(type, value)
sys.stderr.write(''.join(list))
def showtraceback(self):
"""Display the exception that just occurred."""
#Override for avoid using sys.excepthook PY-12600
try:
type, value, tb = sys.exc_info()
sys.last_type = type
sys.last_value = value
sys.last_traceback = tb
tblist = traceback.extract_tb(tb)
del tblist[:1]
lines = traceback.format_list(tblist)
if lines:
lines.insert(0, "Traceback (most recent call last):\n")
lines.extend(traceback.format_exception_only(type, value))
finally:
tblist = tb = None
sys.stderr.write(''.join(lines))
def post_mortem(t=None):
if t is None:
t = sys.exc_info()[2] # Will be valid if we are called from an except handler.
if t is None:
try:
t = sys.last_traceback
except AttributeError:
print "No traceback can be found from which to perform post-mortem debugging!"
print "No debugging can continue"
return
p = _GetCurrentDebugger()
if p.frameShutdown: return # App closing
# No idea why I need to settrace to None - it should have been reset by now?
sys.settrace(None)
p.reset()
while t.tb_next != None: t = t.tb_next
p.bAtPostMortem = 1
p.prep_run(None)
try:
p.interaction(t.tb_frame, t)
finally:
t = None
p.bAtPostMortem = 0
p.done_run()
def showtraceback(self):
"""Display the exception that just occurred.
We remove the first stack item because it is our own code.
The output is written by self.write(), below.
"""
try:
type, value, tb = sys.exc_info()
sys.last_type = type
sys.last_value = value
sys.last_traceback = tb
tblist = traceback.extract_tb(tb)
del tblist[:1]
list = traceback.format_list(tblist)
if list:
list.insert(0, "Traceback (most recent call last):\n")
list[len(list):] = traceback.format_exception_only(type, value)
finally:
tblist = tb = None
map(self.write, list)
def post_mortem(t=None):
if t is None:
t = sys.exc_info()[2] # Will be valid if we are called from an except handler.
if t is None:
try:
t = sys.last_traceback
except AttributeError:
print("No traceback can be found from which to perform post-mortem debugging!")
print("No debugging can continue")
return
p = _GetCurrentDebugger()
if p.frameShutdown: return # App closing
# No idea why I need to settrace to None - it should have been reset by now?
sys.settrace(None)
p.reset()
while t.tb_next != None: t = t.tb_next
p.bAtPostMortem = 1
p.prep_run(None)
try:
p.interaction(t.tb_frame, t)
finally:
t = None
p.bAtPostMortem = 0
p.done_run()
def debugger(self,force=False):
"""Call the pdb debugger.
Keywords:
- force(False): by default, this routine checks the instance call_pdb
flag and does not actually invoke the debugger if the flag is false.
The 'force' option forces the debugger to activate even if the flag
is false.
"""
if not (force or self.call_pdb):
return
if not hasattr(sys,'last_traceback'):
error('No traceback has been produced, nothing to debug.')
return
self.InteractiveTB.debugger(force=True)
#-------------------------------------------------------------------------
# Things related to IPython's various namespaces
#-------------------------------------------------------------------------
def showsyntaxerror(self, filename=None):
"""Display the syntax error that just occurred.
This doesn't display a stack trace because there isn't one.
If a filename is given, it is stuffed in the exception instead
of what was there before (because Python's parser always uses
"<string>" when reading from a string).
"""
etype, value, last_traceback = self._get_exc_info()
if filename and issubclass(etype, SyntaxError):
try:
value.filename = filename
except:
# Not the format we expect; leave it alone
pass
stb = self.SyntaxTB.structured_traceback(etype, value, [])
self._showtraceback(etype, value, stb)
# This is overridden in TerminalInteractiveShell to show a message about
# the %paste magic.
def _stack_viewer(parent):
root = tk.Tk()
root.title("Test StackViewer")
width, height, x, y = list(map(int, re.split('[x+]', parent.geometry())))
root.geometry("+%d+%d"%(x, y + 150))
flist = PyShellFileList(root)
try: # to obtain a traceback object
intentional_name_error
except NameError:
exc_type, exc_value, exc_tb = sys.exc_info()
# inject stack trace to sys
sys.last_type = exc_type
sys.last_value = exc_value
sys.last_traceback = exc_tb
StackBrowser(root, flist=flist, top=root, tb=exc_tb)
# restore sys to original state
del sys.last_type
del sys.last_value
del sys.last_traceback
def print_exception():
import linecache
linecache.checkcache()
flush_stdout()
efile = sys.stderr
typ, val, tb = excinfo = sys.exc_info()
sys.last_type, sys.last_value, sys.last_traceback = excinfo
tbe = traceback.extract_tb(tb)
print>>efile, '\nTraceback (most recent call last):'
exclude = ("run.py", "rpc.py", "threading.py", "Queue.py",
"RemoteDebugger.py", "bdb.py")
cleanup_traceback(tbe, exclude)
traceback.print_list(tbe, file=efile)
lines = traceback.format_exception_only(typ, val)
for line in lines:
print>>efile, line,
def showtraceback(self):
"""Display the exception that just occurred.
We remove the first stack item because it is our own code.
The output is written by self.write(), below.
"""
try:
type, value, tb = sys.exc_info()
sys.last_type = type
sys.last_value = value
sys.last_traceback = tb
tblist = traceback.extract_tb(tb)
del tblist[:1]
list = traceback.format_list(tblist)
if list:
list.insert(0, "Traceback (most recent call last):\n")
list[len(list):] = traceback.format_exception_only(type, value)
finally:
tblist = tb = None
map(self.write, list)
def _stack_viewer(parent):
root = tk.Tk()
root.title("Test StackViewer")
width, height, x, y = list(map(int, re.split('[x+]', parent.geometry())))
root.geometry("+%d+%d"%(x, y + 150))
flist = PyShellFileList(root)
try: # to obtain a traceback object
intentional_name_error
except NameError:
exc_type, exc_value, exc_tb = sys.exc_info()
# inject stack trace to sys
sys.last_type = exc_type
sys.last_value = exc_value
sys.last_traceback = exc_tb
StackBrowser(root, flist=flist, top=root, tb=exc_tb)
# restore sys to original state
del sys.last_type
del sys.last_value
del sys.last_traceback
def test_dis_traceback(self):
self.skipTest('Fix up ability to disassemble straceback')
return
try:
del sys.last_traceback
except AttributeError:
pass
try:
1/0
except Exception as e:
tb = e.__traceback__
sys.last_traceback = tb
tb_dis = self.get_disassemble_as_string(tb.tb_frame.f_code, tb.tb_lasti)
self.do_disassembly_test(None, tb_dis)
def test_dis_traceback(self):
self.skipTest('Fix up ability to disassemble straceback')
return
try:
del sys.last_traceback
except AttributeError:
pass
try:
1/0
except Exception as e:
tb = e.__traceback__
sys.last_traceback = tb
tb_dis = self.get_disassemble_as_string(tb.tb_frame.f_code, tb.tb_lasti)
self.dis_disassembly34(None, tb_dis)
def test_store_except_info_on_eror():
""" Test that upon test failure, the exception info is stored on
sys.last_traceback and friends.
"""
# Simulate item that raises a specific exception
class ItemThatRaises:
def runtest(self):
raise IndexError('TEST')
try:
runner.pytest_runtest_call(ItemThatRaises())
except IndexError:
pass
# Check that exception info is stored on sys
assert sys.last_type is IndexError
assert sys.last_value.args[0] == 'TEST'
assert sys.last_traceback
