Python traceback.StackSummary() Examples

def test_context(self):
        try:
            try:
                1/0
            finally:
                exc_info_context = sys.exc_info()
                exc_context = traceback.TracebackException(*exc_info_context)
                raise Exception("uh oh")
        except Exception:
            exc_info = sys.exc_info()
            exc = traceback.TracebackException(*exc_info)
            expected_stack = traceback.StackSummary.extract(
                traceback.walk_tb(exc_info[2]))
        self.assertEqual(None, exc.__cause__)
        self.assertEqual(exc_context, exc.__context__)
        self.assertEqual(False, exc.__suppress_context__)
        self.assertEqual(expected_stack, exc.stack)
        self.assertEqual(exc_info[0], exc.exc_type)
        self.assertEqual(str(exc_info[1]), str(exc)) 

def test_cause(self):
        try:
            try:
                1/0
            finally:
                exc_info_context = sys.exc_info()
                exc_context = traceback.TracebackException(*exc_info_context)
                cause = Exception("cause")
                raise Exception("uh oh") from cause
        except Exception:
            exc_info = sys.exc_info()
            exc = traceback.TracebackException(*exc_info)
            expected_stack = traceback.StackSummary.extract(
                traceback.walk_tb(exc_info[2]))
        exc_cause = traceback.TracebackException(Exception, cause, None)
        self.assertEqual(exc_cause, exc.__cause__)
        self.assertEqual(exc_context, exc.__context__)
        self.assertEqual(True, exc.__suppress_context__)
        self.assertEqual(expected_stack, exc.stack)
        self.assertEqual(exc_info[0], exc.exc_type)
        self.assertEqual(str(exc_info[1]), str(exc)) 

def test_cause(self):
        try:
            try:
                1/0
            finally:
                exc_info_context = sys.exc_info()
                exc_context = traceback.TracebackException(*exc_info_context)
                cause = Exception("cause")
                raise Exception("uh oh") from cause
        except Exception:
            exc_info = sys.exc_info()
            exc = traceback.TracebackException(*exc_info)
            expected_stack = traceback.StackSummary.extract(
                traceback.walk_tb(exc_info[2]))
        exc_cause = traceback.TracebackException(Exception, cause, None)
        self.assertEqual(exc_cause, exc.__cause__)
        self.assertEqual(exc_context, exc.__context__)
        self.assertEqual(True, exc.__suppress_context__)
        self.assertEqual(expected_stack, exc.stack)
        self.assertEqual(exc_info[0], exc.exc_type)
        self.assertEqual(str(exc_info[1]), str(exc)) 

def test_context(self):
        try:
            try:
                1/0
            finally:
                exc_info_context = sys.exc_info()
                exc_context = traceback.TracebackException(*exc_info_context)
                raise Exception("uh oh")
        except Exception:
            exc_info = sys.exc_info()
            exc = traceback.TracebackException(*exc_info)
            expected_stack = traceback.StackSummary.extract(
                traceback.walk_tb(exc_info[2]))
        self.assertEqual(None, exc.__cause__)
        self.assertEqual(exc_context, exc.__context__)
        self.assertEqual(False, exc.__suppress_context__)
        self.assertEqual(expected_stack, exc.stack)
        self.assertEqual(exc_info[0], exc.exc_type)
        self.assertEqual(str(exc_info[1]), str(exc)) 

def exception_line_in_file(frames: traceback.StackSummary, filename: str) -> Optional[int]:
    for frame in reversed(frames):
        if samefile(frame.filename, filename):
            return frame.lineno
    return None 

def test_limit(self):
        def recurse(n):
            if n:
                recurse(n-1)
            else:
                1/0
        try:
            recurse(10)
        except Exception:
            exc_info = sys.exc_info()
            exc = traceback.TracebackException(*exc_info, limit=5)
            expected_stack = traceback.StackSummary.extract(
                traceback.walk_tb(exc_info[2]), limit=5)
        self.assertEqual(expected_stack, exc.stack) 

def test_smoke(self):
        try:
            1/0
        except Exception:
            exc_info = sys.exc_info()
            exc = traceback.TracebackException(*exc_info)
            expected_stack = traceback.StackSummary.extract(
                traceback.walk_tb(exc_info[2]))
        self.assertEqual(None, exc.__cause__)
        self.assertEqual(None, exc.__context__)
        self.assertEqual(False, exc.__suppress_context__)
        self.assertEqual(expected_stack, exc.stack)
        self.assertEqual(exc_info[0], exc.exc_type)
        self.assertEqual(str(exc_info[1]), str(exc)) 

def test_format_locals(self):
        def some_inner(k, v):
            a = 1
            b = 2
            return traceback.StackSummary.extract(
                traceback.walk_stack(None), capture_locals=True, limit=1)
        s = some_inner(3, 4)
        self.assertEqual(
            ['  File "%s", line %d, in some_inner\n'
             '    traceback.walk_stack(None), capture_locals=True, limit=1)\n'
             '    a = 1\n'
             '    b = 2\n'
             '    k = 3\n'
             '    v = 4\n' % (__file__, some_inner.__code__.co_firstlineno + 4)
            ], s.format()) 

def test_no_locals(self):
        linecache.updatecache('/foo.py', globals())
        c = test_code('/foo.py', 'method')
        f = test_frame(c, globals(), {'something': 1})
        s = traceback.StackSummary.extract(iter([(f, 6)]))
        self.assertEqual(s[0].locals, None) 

def test_locals(self):
        linecache.updatecache('/foo.py', globals())
        c = test_code('/foo.py', 'method')
        f = test_frame(c, globals(), {'something': 1})
        s = traceback.StackSummary.extract(iter([(f, 6)]), capture_locals=True)
        self.assertEqual(s[0].locals, {'something': '1'}) 

def test_format_smoke(self):
        # For detailed tests see the format_list tests, which consume the same
        # code.
        s = traceback.StackSummary.from_list([('foo.py', 1, 'fred', 'line')])
        self.assertEqual(
            ['  File "foo.py", line 1, in fred\n    line\n'],
            s.format()) 

def test_from_list(self):
        s = traceback.StackSummary.from_list([('foo.py', 1, 'fred', 'line')])
        self.assertEqual(
            ['  File "foo.py", line 1, in fred\n    line\n'],
            s.format()) 

def test_extract_stackup_deferred_lookup_lines(self):
        linecache.clearcache()
        c = test_code('/foo.py', 'method')
        f = test_frame(c, None, None)
        s = traceback.StackSummary.extract(iter([(f, 6)]), lookup_lines=False)
        self.assertEqual({}, linecache.cache)
        linecache.updatecache('/foo.py', globals())
        self.assertEqual(s[0].line, "import sys") 

def test_extract_stack_lookup_lines(self):
        linecache.clearcache()
        linecache.updatecache('/foo.py', globals())
        c = test_code('/foo.py', 'method')
        f = test_frame(c, None, None)
        s = traceback.StackSummary.extract(iter([(f, 6)]), lookup_lines=True)
        linecache.clearcache()
        self.assertEqual(s[0].line, "import sys") 

def test_extract_stack_limit(self):
        s = traceback.StackSummary.extract(traceback.walk_stack(None), limit=5)
        self.assertEqual(len(s), 5) 

def test_extract_stack(self):
        s = traceback.StackSummary.extract(traceback.walk_stack(None))
        self.assertIsInstance(s, traceback.StackSummary) 

def frame_summary_for_fn(frames: traceback.StackSummary, fn: Callable) -> Tuple[str, int]:
    fn_name = fn.__name__
    fn_file = cast(str, inspect.getsourcefile(fn))
    for frame in reversed(frames):
        if (frame.name == fn_name and
            samefile(frame.filename, fn_file)):
            return (frame.filename, frame.lineno)
    try:
        (_, fn_start_line) = inspect.getsourcelines(fn)
        return fn_file, fn_start_line
    except OSError:
        debug(f'Unable to get source information for function {fn_name} in file "{fn_file}"')
        return (fn_file, 0) 

def test_extract_stack(self):
        s = traceback.StackSummary.extract(traceback.walk_stack(None))
        self.assertIsInstance(s, traceback.StackSummary) 

def test_sets_traceback(self, event_loop):
        event_loop.set_debug(True)
        task = context.task_factory(event_loop, dummy())
        task.cancel()

        assert isinstance(task._source_traceback, traceback.StackSummary) 

def test_limit(self):
        def recurse(n):
            if n:
                recurse(n-1)
            else:
                1/0
        try:
            recurse(10)
        except Exception:
            exc_info = sys.exc_info()
            exc = traceback.TracebackException(*exc_info, limit=5)
            expected_stack = traceback.StackSummary.extract(
                traceback.walk_tb(exc_info[2]), limit=5)
        self.assertEqual(expected_stack, exc.stack) 

def test_smoke(self):
        try:
            1/0
        except Exception:
            exc_info = sys.exc_info()
            exc = traceback.TracebackException(*exc_info)
            expected_stack = traceback.StackSummary.extract(
                traceback.walk_tb(exc_info[2]))
        self.assertEqual(None, exc.__cause__)
        self.assertEqual(None, exc.__context__)
        self.assertEqual(False, exc.__suppress_context__)
        self.assertEqual(expected_stack, exc.stack)
        self.assertEqual(exc_info[0], exc.exc_type)
        self.assertEqual(str(exc_info[1]), str(exc)) 

def test_format_locals(self):
        def some_inner(k, v):
            a = 1
            b = 2
            return traceback.StackSummary.extract(
                traceback.walk_stack(None), capture_locals=True, limit=1)
        s = some_inner(3, 4)
        self.assertEqual(
            ['  File "%s", line %d, in some_inner\n'
             '    traceback.walk_stack(None), capture_locals=True, limit=1)\n'
             '    a = 1\n'
             '    b = 2\n'
             '    k = 3\n'
             '    v = 4\n' % (__file__, some_inner.__code__.co_firstlineno + 4)
            ], s.format()) 

def test_no_locals(self):
        linecache.updatecache('/foo.py', globals())
        c = test_code('/foo.py', 'method')
        f = test_frame(c, globals(), {'something': 1})
        s = traceback.StackSummary.extract(iter([(f, 6)]))
        self.assertEqual(s[0].locals, None) 

def test_locals(self):
        linecache.updatecache('/foo.py', globals())
        c = test_code('/foo.py', 'method')
        f = test_frame(c, globals(), {'something': 1})
        s = traceback.StackSummary.extract(iter([(f, 6)]), capture_locals=True)
        self.assertEqual(s[0].locals, {'something': '1'}) 

def test_format_smoke(self):
        # For detailed tests see the format_list tests, which consume the same
        # code.
        s = traceback.StackSummary.from_list([('foo.py', 1, 'fred', 'line')])
        self.assertEqual(
            ['  File "foo.py", line 1, in fred\n    line\n'],
            s.format()) 

def test_from_list(self):
        s = traceback.StackSummary.from_list([('foo.py', 1, 'fred', 'line')])
        self.assertEqual(
            ['  File "foo.py", line 1, in fred\n    line\n'],
            s.format()) 

def test_extract_stackup_deferred_lookup_lines(self):
        linecache.clearcache()
        c = test_code('/foo.py', 'method')
        f = test_frame(c, None, None)
        s = traceback.StackSummary.extract(iter([(f, 6)]), lookup_lines=False)
        self.assertEqual({}, linecache.cache)
        linecache.updatecache('/foo.py', globals())
        self.assertEqual(s[0].line, "import sys") 

def test_extract_stack_lookup_lines(self):
        linecache.clearcache()
        linecache.updatecache('/foo.py', globals())
        c = test_code('/foo.py', 'method')
        f = test_frame(c, None, None)
        s = traceback.StackSummary.extract(iter([(f, 6)]), lookup_lines=True)
        linecache.clearcache()
        self.assertEqual(s[0].line, "import sys") 

def test_extract_stack_limit(self):
        s = traceback.StackSummary.extract(traceback.walk_stack(None), limit=5)
        self.assertEqual(len(s), 5)