forked from python/cpython
-
Notifications
You must be signed in to change notification settings - Fork 1
/
Copy pathtest_traceback.py
2765 lines (2425 loc) · 109 KB
/
test_traceback.py
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
"""Test cases for traceback module"""
from collections import namedtuple
from io import StringIO
import linecache
import sys
import types
import inspect
import unittest
import re
from test import support
from test.support import (Error, captured_output, cpython_only, ALWAYS_EQ,
requires_debug_ranges, has_no_debug_ranges,
requires_subprocess)
from test.support.os_helper import TESTFN, unlink
from test.support.script_helper import assert_python_ok, assert_python_failure
import textwrap
import traceback
from functools import partial
MODULE_PREFIX = f'{__name__}.' if __name__ == '__main__' else ''
test_code = namedtuple('code', ['co_filename', 'co_name'])
test_code.co_positions = lambda _: iter([(6, 6, 0, 0)])
test_frame = namedtuple('frame', ['f_code', 'f_globals', 'f_locals'])
test_tb = namedtuple('tb', ['tb_frame', 'tb_lineno', 'tb_next', 'tb_lasti'])
class TracebackCases(unittest.TestCase):
# For now, a very minimal set of tests. I want to be sure that
# formatting of SyntaxErrors works based on changes for 2.1.
def get_exception_format(self, func, exc):
try:
func()
except exc as value:
return traceback.format_exception_only(exc, value)
else:
raise ValueError("call did not raise exception")
def syntax_error_with_caret(self):
compile("def fact(x):\n\treturn x!\n", "?", "exec")
def syntax_error_with_caret_2(self):
compile("1 +\n", "?", "exec")
def syntax_error_with_caret_range(self):
compile("f(x, y for y in range(30), z)", "?", "exec")
def syntax_error_bad_indentation(self):
compile("def spam():\n print(1)\n print(2)", "?", "exec")
def syntax_error_with_caret_non_ascii(self):
compile('Python = "\u1e54\xfd\u0163\u0125\xf2\xf1" +', "?", "exec")
def syntax_error_bad_indentation2(self):
compile(" print(2)", "?", "exec")
def tokenizer_error_with_caret_range(self):
compile("blech ( ", "?", "exec")
def test_caret(self):
err = self.get_exception_format(self.syntax_error_with_caret,
SyntaxError)
self.assertEqual(len(err), 4)
self.assertTrue(err[1].strip() == "return x!")
self.assertIn("^", err[2]) # third line has caret
self.assertEqual(err[1].find("!"), err[2].find("^")) # in the right place
self.assertEqual(err[2].count("^"), 1)
err = self.get_exception_format(self.syntax_error_with_caret_2,
SyntaxError)
self.assertIn("^", err[2]) # third line has caret
self.assertEqual(err[2].count('\n'), 1) # and no additional newline
self.assertEqual(err[1].find("+") + 1, err[2].find("^")) # in the right place
self.assertEqual(err[2].count("^"), 1)
err = self.get_exception_format(self.syntax_error_with_caret_non_ascii,
SyntaxError)
self.assertIn("^", err[2]) # third line has caret
self.assertEqual(err[2].count('\n'), 1) # and no additional newline
self.assertEqual(err[1].find("+") + 1, err[2].find("^")) # in the right place
self.assertEqual(err[2].count("^"), 1)
err = self.get_exception_format(self.syntax_error_with_caret_range,
SyntaxError)
self.assertIn("^", err[2]) # third line has caret
self.assertEqual(err[2].count('\n'), 1) # and no additional newline
self.assertEqual(err[1].find("y"), err[2].find("^")) # in the right place
self.assertEqual(err[2].count("^"), len("y for y in range(30)"))
err = self.get_exception_format(self.tokenizer_error_with_caret_range,
SyntaxError)
self.assertIn("^", err[2]) # third line has caret
self.assertEqual(err[2].count('\n'), 1) # and no additional newline
self.assertEqual(err[1].find("("), err[2].find("^")) # in the right place
self.assertEqual(err[2].count("^"), 1)
def test_nocaret(self):
exc = SyntaxError("error", ("x.py", 23, None, "bad syntax"))
err = traceback.format_exception_only(SyntaxError, exc)
self.assertEqual(len(err), 3)
self.assertEqual(err[1].strip(), "bad syntax")
def test_no_caret_with_no_debug_ranges_flag(self):
# Make sure that if `-X no_debug_ranges` is used, there are no carets
# in the traceback.
try:
with open(TESTFN, 'w') as f:
f.write("x = 1 / 0\n")
_, _, stderr = assert_python_failure(
'-X', 'no_debug_ranges', TESTFN)
lines = stderr.splitlines()
self.assertEqual(len(lines), 4)
self.assertEqual(lines[0], b'Traceback (most recent call last):')
self.assertIn(b'line 1, in <module>', lines[1])
self.assertEqual(lines[2], b' x = 1 / 0')
self.assertEqual(lines[3], b'ZeroDivisionError: division by zero')
finally:
unlink(TESTFN)
def test_no_caret_with_no_debug_ranges_flag_python_traceback(self):
code = textwrap.dedent("""
import traceback
try:
x = 1 / 0
except:
traceback.print_exc()
""")
try:
with open(TESTFN, 'w') as f:
f.write(code)
_, _, stderr = assert_python_ok(
'-X', 'no_debug_ranges', TESTFN)
lines = stderr.splitlines()
self.assertEqual(len(lines), 4)
self.assertEqual(lines[0], b'Traceback (most recent call last):')
self.assertIn(b'line 4, in <module>', lines[1])
self.assertEqual(lines[2], b' x = 1 / 0')
self.assertEqual(lines[3], b'ZeroDivisionError: division by zero')
finally:
unlink(TESTFN)
def test_recursion_error_during_traceback(self):
code = textwrap.dedent("""
import sys
from weakref import ref
sys.setrecursionlimit(15)
def f():
ref(lambda: 0, [])
f()
try:
f()
except RecursionError:
pass
""")
try:
with open(TESTFN, 'w') as f:
f.write(code)
rc, _, _ = assert_python_ok(TESTFN)
self.assertEqual(rc, 0)
finally:
unlink(TESTFN)
def test_bad_indentation(self):
err = self.get_exception_format(self.syntax_error_bad_indentation,
IndentationError)
self.assertEqual(len(err), 4)
self.assertEqual(err[1].strip(), "print(2)")
self.assertIn("^", err[2])
self.assertEqual(err[1].find(")") + 1, err[2].find("^"))
# No caret for "unexpected indent"
err = self.get_exception_format(self.syntax_error_bad_indentation2,
IndentationError)
self.assertEqual(len(err), 3)
self.assertEqual(err[1].strip(), "print(2)")
def test_base_exception(self):
# Test that exceptions derived from BaseException are formatted right
e = KeyboardInterrupt()
lst = traceback.format_exception_only(e.__class__, e)
self.assertEqual(lst, ['KeyboardInterrupt\n'])
def test_format_exception_only_bad__str__(self):
class X(Exception):
def __str__(self):
1/0
err = traceback.format_exception_only(X, X())
self.assertEqual(len(err), 1)
str_value = '<exception str() failed>'
if X.__module__ in ('__main__', 'builtins'):
str_name = X.__qualname__
else:
str_name = '.'.join([X.__module__, X.__qualname__])
self.assertEqual(err[0], "%s: %s\n" % (str_name, str_value))
@requires_subprocess()
def test_encoded_file(self):
# Test that tracebacks are correctly printed for encoded source files:
# - correct line number (Issue2384)
# - respect file encoding (Issue3975)
import sys, subprocess
# The spawned subprocess has its stdout redirected to a PIPE, and its
# encoding may be different from the current interpreter, on Windows
# at least.
process = subprocess.Popen([sys.executable, "-c",
"import sys; print(sys.stdout.encoding)"],
stdout=subprocess.PIPE,
stderr=subprocess.STDOUT)
stdout, stderr = process.communicate()
output_encoding = str(stdout, 'ascii').splitlines()[0]
def do_test(firstlines, message, charset, lineno):
# Raise the message in a subprocess, and catch the output
try:
with open(TESTFN, "w", encoding=charset) as output:
output.write("""{0}if 1:
import traceback;
raise RuntimeError('{1}')
""".format(firstlines, message))
process = subprocess.Popen([sys.executable, TESTFN],
stdout=subprocess.PIPE, stderr=subprocess.STDOUT)
stdout, stderr = process.communicate()
stdout = stdout.decode(output_encoding).splitlines()
finally:
unlink(TESTFN)
# The source lines are encoded with the 'backslashreplace' handler
encoded_message = message.encode(output_encoding,
'backslashreplace')
# and we just decoded them with the output_encoding.
message_ascii = encoded_message.decode(output_encoding)
err_line = "raise RuntimeError('{0}')".format(message_ascii)
err_msg = "RuntimeError: {0}".format(message_ascii)
self.assertIn(("line %s" % lineno), stdout[1],
"Invalid line number: {0!r} instead of {1}".format(
stdout[1], lineno))
self.assertTrue(stdout[2].endswith(err_line),
"Invalid traceback line: {0!r} instead of {1!r}".format(
stdout[2], err_line))
actual_err_msg = stdout[3 if has_no_debug_ranges() else 4]
self.assertTrue(actual_err_msg == err_msg,
"Invalid error message: {0!r} instead of {1!r}".format(
actual_err_msg, err_msg))
do_test("", "foo", "ascii", 3)
for charset in ("ascii", "iso-8859-1", "utf-8", "GBK"):
if charset == "ascii":
text = "foo"
elif charset == "GBK":
text = "\u4E02\u5100"
else:
text = "h\xe9 ho"
do_test("# coding: {0}\n".format(charset),
text, charset, 4)
do_test("#!shebang\n# coding: {0}\n".format(charset),
text, charset, 5)
do_test(" \t\f\n# coding: {0}\n".format(charset),
text, charset, 5)
# Issue #18960: coding spec should have no effect
do_test("x=0\n# coding: GBK\n", "h\xe9 ho", 'utf-8', 5)
def test_print_traceback_at_exit(self):
# Issue #22599: Ensure that it is possible to use the traceback module
# to display an exception at Python exit
code = textwrap.dedent("""
import sys
import traceback
class PrintExceptionAtExit(object):
def __init__(self):
try:
x = 1 / 0
except Exception:
self.exc_info = sys.exc_info()
# self.exc_info[1] (traceback) contains frames:
# explicitly clear the reference to self in the current
# frame to break a reference cycle
self = None
def __del__(self):
traceback.print_exception(*self.exc_info)
# Keep a reference in the module namespace to call the destructor
# when the module is unloaded
obj = PrintExceptionAtExit()
""")
rc, stdout, stderr = assert_python_ok('-c', code)
expected = [b'Traceback (most recent call last):',
b' File "<string>", line 8, in __init__',
b'ZeroDivisionError: division by zero']
self.assertEqual(stderr.splitlines(), expected)
def test_print_exception(self):
output = StringIO()
traceback.print_exception(
Exception, Exception("projector"), None, file=output
)
self.assertEqual(output.getvalue(), "Exception: projector\n")
def test_print_exception_exc(self):
output = StringIO()
traceback.print_exception(Exception("projector"), file=output)
self.assertEqual(output.getvalue(), "Exception: projector\n")
def test_format_exception_exc(self):
e = Exception("projector")
output = traceback.format_exception(e)
self.assertEqual(output, ["Exception: projector\n"])
with self.assertRaisesRegex(ValueError, 'Both or neither'):
traceback.format_exception(e.__class__, e)
with self.assertRaisesRegex(ValueError, 'Both or neither'):
traceback.format_exception(e.__class__, tb=e.__traceback__)
with self.assertRaisesRegex(TypeError, 'positional-only'):
traceback.format_exception(exc=e)
def test_format_exception_only_exc(self):
output = traceback.format_exception_only(Exception("projector"))
self.assertEqual(output, ["Exception: projector\n"])
def test_exception_is_None(self):
NONE_EXC_STRING = 'NoneType: None\n'
excfile = StringIO()
traceback.print_exception(None, file=excfile)
self.assertEqual(excfile.getvalue(), NONE_EXC_STRING)
excfile = StringIO()
traceback.print_exception(None, None, None, file=excfile)
self.assertEqual(excfile.getvalue(), NONE_EXC_STRING)
excfile = StringIO()
traceback.print_exc(None, file=excfile)
self.assertEqual(excfile.getvalue(), NONE_EXC_STRING)
self.assertEqual(traceback.format_exc(None), NONE_EXC_STRING)
self.assertEqual(traceback.format_exception(None), [NONE_EXC_STRING])
self.assertEqual(
traceback.format_exception(None, None, None), [NONE_EXC_STRING])
self.assertEqual(
traceback.format_exception_only(None), [NONE_EXC_STRING])
self.assertEqual(
traceback.format_exception_only(None, None), [NONE_EXC_STRING])
def test_signatures(self):
self.assertEqual(
str(inspect.signature(traceback.print_exception)),
('(exc, /, value=<implicit>, tb=<implicit>, '
'limit=None, file=None, chain=True)'))
self.assertEqual(
str(inspect.signature(traceback.format_exception)),
('(exc, /, value=<implicit>, tb=<implicit>, limit=None, '
'chain=True)'))
self.assertEqual(
str(inspect.signature(traceback.format_exception_only)),
'(exc, /, value=<implicit>)')
@requires_debug_ranges()
class TracebackErrorLocationCaretTests(unittest.TestCase):
"""
Tests for printing code error expressions as part of PEP 657
"""
def get_exception(self, callable):
try:
callable()
self.fail("No exception thrown.")
except:
return traceback.format_exc().splitlines()[:-1]
callable_line = get_exception.__code__.co_firstlineno + 2
def test_basic_caret(self):
def f():
raise ValueError("basic caret tests")
lineno_f = f.__code__.co_firstlineno
expected_f = (
'Traceback (most recent call last):\n'
f' File "{__file__}", line {self.callable_line}, in get_exception\n'
' callable()\n'
' ^^^^^^^^^^\n'
f' File "{__file__}", line {lineno_f+1}, in f\n'
' raise ValueError("basic caret tests")\n'
' ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^\n'
)
result_lines = self.get_exception(f)
self.assertEqual(result_lines, expected_f.splitlines())
def test_line_with_unicode(self):
# Make sure that even if a line contains multi-byte unicode characters
# the correct carets are printed.
def f_with_unicode():
raise ValueError("Ĥellö Wörld")
lineno_f = f_with_unicode.__code__.co_firstlineno
expected_f = (
'Traceback (most recent call last):\n'
f' File "{__file__}", line {self.callable_line}, in get_exception\n'
' callable()\n'
' ^^^^^^^^^^\n'
f' File "{__file__}", line {lineno_f+1}, in f_with_unicode\n'
' raise ValueError("Ĥellö Wörld")\n'
' ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^\n'
)
result_lines = self.get_exception(f_with_unicode)
self.assertEqual(result_lines, expected_f.splitlines())
def test_caret_in_type_annotation(self):
def f_with_type():
def foo(a: THIS_DOES_NOT_EXIST ) -> int:
return 0
lineno_f = f_with_type.__code__.co_firstlineno
expected_f = (
'Traceback (most recent call last):\n'
f' File "{__file__}", line {self.callable_line}, in get_exception\n'
' callable()\n'
' ^^^^^^^^^^\n'
f' File "{__file__}", line {lineno_f+1}, in f_with_type\n'
' def foo(a: THIS_DOES_NOT_EXIST ) -> int:\n'
' ^^^^^^^^^^^^^^^^^^^\n'
)
result_lines = self.get_exception(f_with_type)
self.assertEqual(result_lines, expected_f.splitlines())
def test_caret_multiline_expression(self):
# Make sure no carets are printed for expressions spanning multiple
# lines.
def f_with_multiline():
raise ValueError(
"error over multiple lines"
)
lineno_f = f_with_multiline.__code__.co_firstlineno
expected_f = (
'Traceback (most recent call last):\n'
f' File "{__file__}", line {self.callable_line}, in get_exception\n'
' callable()\n'
' ^^^^^^^^^^\n'
f' File "{__file__}", line {lineno_f+1}, in f_with_multiline\n'
' raise ValueError(\n'
' ^^^^^^^^^^^^^^^^^'
)
result_lines = self.get_exception(f_with_multiline)
self.assertEqual(result_lines, expected_f.splitlines())
def test_caret_multiline_expression_syntax_error(self):
# Make sure an expression spanning multiple lines that has
# a syntax error is correctly marked with carets.
code = textwrap.dedent("""
def foo(*args, **kwargs):
pass
a, b, c = 1, 2, 3
foo(a, z
for z in
range(10), b, c)
""")
def f_with_multiline():
# Need to defer the compilation until in self.get_exception(..)
return compile(code, "?", "exec")
lineno_f = f_with_multiline.__code__.co_firstlineno
expected_f = (
'Traceback (most recent call last):\n'
f' File "{__file__}", line {self.callable_line}, in get_exception\n'
' callable()\n'
' ^^^^^^^^^^\n'
f' File "{__file__}", line {lineno_f+2}, in f_with_multiline\n'
' return compile(code, "?", "exec")\n'
' ^^^^^^^^^^^^^^^^^^^^^^^^^^\n'
' File "?", line 7\n'
' foo(a, z\n'
' ^'
)
result_lines = self.get_exception(f_with_multiline)
self.assertEqual(result_lines, expected_f.splitlines())
def test_caret_multiline_expression_bin_op(self):
# Make sure no carets are printed for expressions spanning multiple
# lines.
def f_with_multiline():
return (
1 /
0 +
2
)
lineno_f = f_with_multiline.__code__.co_firstlineno
expected_f = (
'Traceback (most recent call last):\n'
f' File "{__file__}", line {self.callable_line}, in get_exception\n'
' callable()\n'
' ^^^^^^^^^^\n'
f' File "{__file__}", line {lineno_f+2}, in f_with_multiline\n'
' 1 /\n'
' ^^^'
)
result_lines = self.get_exception(f_with_multiline)
self.assertEqual(result_lines, expected_f.splitlines())
def test_caret_for_binary_operators(self):
def f_with_binary_operator():
divisor = 20
return 10 + divisor / 0 + 30
lineno_f = f_with_binary_operator.__code__.co_firstlineno
expected_error = (
'Traceback (most recent call last):\n'
f' File "{__file__}", line {self.callable_line}, in get_exception\n'
' callable()\n'
' ^^^^^^^^^^\n'
f' File "{__file__}", line {lineno_f+2}, in f_with_binary_operator\n'
' return 10 + divisor / 0 + 30\n'
' ~~~~~~~~^~~\n'
)
result_lines = self.get_exception(f_with_binary_operator)
self.assertEqual(result_lines, expected_error.splitlines())
def test_caret_for_binary_operators_two_char(self):
def f_with_binary_operator():
divisor = 20
return 10 + divisor // 0 + 30
lineno_f = f_with_binary_operator.__code__.co_firstlineno
expected_error = (
'Traceback (most recent call last):\n'
f' File "{__file__}", line {self.callable_line}, in get_exception\n'
' callable()\n'
' ^^^^^^^^^^\n'
f' File "{__file__}", line {lineno_f+2}, in f_with_binary_operator\n'
' return 10 + divisor // 0 + 30\n'
' ~~~~~~~~^^~~\n'
)
result_lines = self.get_exception(f_with_binary_operator)
self.assertEqual(result_lines, expected_error.splitlines())
def test_caret_for_subscript(self):
def f_with_subscript():
some_dict = {'x': {'y': None}}
return some_dict['x']['y']['z']
lineno_f = f_with_subscript.__code__.co_firstlineno
expected_error = (
'Traceback (most recent call last):\n'
f' File "{__file__}", line {self.callable_line}, in get_exception\n'
' callable()\n'
' ^^^^^^^^^^\n'
f' File "{__file__}", line {lineno_f+2}, in f_with_subscript\n'
" return some_dict['x']['y']['z']\n"
' ~~~~~~~~~~~~~~~~~~~^^^^^\n'
)
result_lines = self.get_exception(f_with_subscript)
self.assertEqual(result_lines, expected_error.splitlines())
def test_traceback_specialization_with_syntax_error(self):
bytecode = compile("1 / 0 / 1 / 2\n", TESTFN, "exec")
with open(TESTFN, "w") as file:
# make the file's contents invalid
file.write("1 $ 0 / 1 / 2\n")
self.addCleanup(unlink, TESTFN)
func = partial(exec, bytecode)
result_lines = self.get_exception(func)
lineno_f = bytecode.co_firstlineno
expected_error = (
'Traceback (most recent call last):\n'
f' File "{__file__}", line {self.callable_line}, in get_exception\n'
' callable()\n'
' ^^^^^^^^^^\n'
f' File "{TESTFN}", line {lineno_f}, in <module>\n'
" 1 $ 0 / 1 / 2\n"
' ^^^^^\n'
)
self.assertEqual(result_lines, expected_error.splitlines())
def test_traceback_very_long_line(self):
source = "a" * 256
bytecode = compile(source, TESTFN, "exec")
with open(TESTFN, "w") as file:
file.write(source)
self.addCleanup(unlink, TESTFN)
func = partial(exec, bytecode)
result_lines = self.get_exception(func)
lineno_f = bytecode.co_firstlineno
expected_error = (
'Traceback (most recent call last):\n'
f' File "{__file__}", line {self.callable_line}, in get_exception\n'
' callable()\n'
' ^^^^^^^^^^\n'
f' File "{TESTFN}", line {lineno_f}, in <module>\n'
f' {source}\n'
f' {"^"*len(source)}\n'
)
self.assertEqual(result_lines, expected_error.splitlines())
def assertSpecialized(self, func, expected_specialization):
result_lines = self.get_exception(func)
specialization_line = result_lines[-1]
self.assertEqual(specialization_line.lstrip(), expected_specialization)
def test_specialization_variations(self):
self.assertSpecialized(lambda: 1/0,
"~^~")
self.assertSpecialized(lambda: 1/0/3,
"~^~")
self.assertSpecialized(lambda: 1 / 0,
"~~^~~")
self.assertSpecialized(lambda: 1 / 0 / 3,
"~~^~~")
self.assertSpecialized(lambda: 1/ 0,
"~^~~")
self.assertSpecialized(lambda: 1/ 0/3,
"~^~~")
self.assertSpecialized(lambda: 1 / 0,
"~~~~~^~~~")
self.assertSpecialized(lambda: 1 / 0 / 5,
"~~~~~^~~~")
self.assertSpecialized(lambda: 1 /0,
"~~^~")
self.assertSpecialized(lambda: 1//0,
"~^^~")
self.assertSpecialized(lambda: 1//0//4,
"~^^~")
self.assertSpecialized(lambda: 1 // 0,
"~~^^~~")
self.assertSpecialized(lambda: 1 // 0 // 4,
"~~^^~~")
self.assertSpecialized(lambda: 1 //0,
"~~^^~")
self.assertSpecialized(lambda: 1// 0,
"~^^~~")
def test_decorator_application_lineno_correct(self):
def dec_error(func):
raise TypeError
def dec_fine(func):
return func
def applydecs():
@dec_error
@dec_fine
def g(): pass
result_lines = self.get_exception(applydecs)
lineno_applydescs = applydecs.__code__.co_firstlineno
lineno_dec_error = dec_error.__code__.co_firstlineno
expected_error = (
'Traceback (most recent call last):\n'
f' File "{__file__}", line {self.callable_line}, in get_exception\n'
' callable()\n'
' ^^^^^^^^^^\n'
f' File "{__file__}", line {lineno_applydescs + 1}, in applydecs\n'
' @dec_error\n'
' ^^^^^^^^^\n'
f' File "{__file__}", line {lineno_dec_error + 1}, in dec_error\n'
' raise TypeError\n'
' ^^^^^^^^^^^^^^^\n'
)
self.assertEqual(result_lines, expected_error.splitlines())
def applydecs_class():
@dec_error
@dec_fine
class A: pass
result_lines = self.get_exception(applydecs_class)
lineno_applydescs_class = applydecs_class.__code__.co_firstlineno
expected_error = (
'Traceback (most recent call last):\n'
f' File "{__file__}", line {self.callable_line}, in get_exception\n'
' callable()\n'
' ^^^^^^^^^^\n'
f' File "{__file__}", line {lineno_applydescs_class + 1}, in applydecs_class\n'
' @dec_error\n'
' ^^^^^^^^^\n'
f' File "{__file__}", line {lineno_dec_error + 1}, in dec_error\n'
' raise TypeError\n'
' ^^^^^^^^^^^^^^^\n'
)
self.assertEqual(result_lines, expected_error.splitlines())
@cpython_only
@requires_debug_ranges()
class CPythonTracebackErrorCaretTests(TracebackErrorLocationCaretTests):
"""
Same set of tests as above but with Python's internal traceback printing.
"""
def get_exception(self, callable):
from _testcapi import exception_print
try:
callable()
self.fail("No exception thrown.")
except Exception as e:
with captured_output("stderr") as tbstderr:
exception_print(e)
return tbstderr.getvalue().splitlines()[:-1]
callable_line = get_exception.__code__.co_firstlineno + 3
class TracebackFormatTests(unittest.TestCase):
def some_exception(self):
raise KeyError('blah')
@cpython_only
def check_traceback_format(self, cleanup_func=None):
from _testcapi import traceback_print
try:
self.some_exception()
except KeyError:
type_, value, tb = sys.exc_info()
if cleanup_func is not None:
# Clear the inner frames, not this one
cleanup_func(tb.tb_next)
traceback_fmt = 'Traceback (most recent call last):\n' + \
''.join(traceback.format_tb(tb))
file_ = StringIO()
traceback_print(tb, file_)
python_fmt = file_.getvalue()
# Call all _tb and _exc functions
with captured_output("stderr") as tbstderr:
traceback.print_tb(tb)
tbfile = StringIO()
traceback.print_tb(tb, file=tbfile)
with captured_output("stderr") as excstderr:
traceback.print_exc()
excfmt = traceback.format_exc()
excfile = StringIO()
traceback.print_exc(file=excfile)
else:
raise Error("unable to create test traceback string")
# Make sure that Python and the traceback module format the same thing
self.assertEqual(traceback_fmt, python_fmt)
# Now verify the _tb func output
self.assertEqual(tbstderr.getvalue(), tbfile.getvalue())
# Now verify the _exc func output
self.assertEqual(excstderr.getvalue(), excfile.getvalue())
self.assertEqual(excfmt, excfile.getvalue())
# Make sure that the traceback is properly indented.
tb_lines = python_fmt.splitlines()
banner = tb_lines[0]
if has_no_debug_ranges():
self.assertEqual(len(tb_lines), 5)
location, source_line = tb_lines[-2], tb_lines[-1]
else:
self.assertEqual(len(tb_lines), 7)
location, source_line = tb_lines[-3], tb_lines[-2]
self.assertTrue(banner.startswith('Traceback'))
self.assertTrue(location.startswith(' File'))
self.assertTrue(source_line.startswith(' raise'))
def test_traceback_format(self):
self.check_traceback_format()
def test_traceback_format_with_cleared_frames(self):
# Check that traceback formatting also works with a clear()ed frame
def cleanup_tb(tb):
tb.tb_frame.clear()
self.check_traceback_format(cleanup_tb)
def test_stack_format(self):
# Verify _stack functions. Note we have to use _getframe(1) to
# compare them without this frame appearing in the output
with captured_output("stderr") as ststderr:
traceback.print_stack(sys._getframe(1))
stfile = StringIO()
traceback.print_stack(sys._getframe(1), file=stfile)
self.assertEqual(ststderr.getvalue(), stfile.getvalue())
stfmt = traceback.format_stack(sys._getframe(1))
self.assertEqual(ststderr.getvalue(), "".join(stfmt))
def test_print_stack(self):
def prn():
traceback.print_stack()
with captured_output("stderr") as stderr:
prn()
lineno = prn.__code__.co_firstlineno
self.assertEqual(stderr.getvalue().splitlines()[-4:], [
' File "%s", line %d, in test_print_stack' % (__file__, lineno+3),
' prn()',
' File "%s", line %d, in prn' % (__file__, lineno+1),
' traceback.print_stack()',
])
# issue 26823 - Shrink recursive tracebacks
def _check_recursive_traceback_display(self, render_exc):
# Always show full diffs when this test fails
# Note that rearranging things may require adjusting
# the relative line numbers in the expected tracebacks
self.maxDiff = None
# Check hitting the recursion limit
def f():
f()
with captured_output("stderr") as stderr_f:
try:
f()
except RecursionError:
render_exc()
else:
self.fail("no recursion occurred")
lineno_f = f.__code__.co_firstlineno
result_f = (
'Traceback (most recent call last):\n'
f' File "{__file__}", line {lineno_f+5}, in _check_recursive_traceback_display\n'
' f()\n'
' ^^^\n'
f' File "{__file__}", line {lineno_f+1}, in f\n'
' f()\n'
' ^^^\n'
f' File "{__file__}", line {lineno_f+1}, in f\n'
' f()\n'
' ^^^\n'
f' File "{__file__}", line {lineno_f+1}, in f\n'
' f()\n'
' ^^^\n'
# XXX: The following line changes depending on whether the tests
# are run through the interactive interpreter or with -m
# It also varies depending on the platform (stack size)
# Fortunately, we don't care about exactness here, so we use regex
r' \[Previous line repeated (\d+) more times\]' '\n'
'RecursionError: maximum recursion depth exceeded\n'
)
expected = result_f.splitlines()
actual = stderr_f.getvalue().splitlines()
# Check the output text matches expectations
# 2nd last line contains the repetition count
self.assertEqual(actual[:-2], expected[:-2])
self.assertRegex(actual[-2], expected[-2])
# last line can have additional text appended
self.assertIn(expected[-1], actual[-1])
# Check the recursion count is roughly as expected
rec_limit = sys.getrecursionlimit()
self.assertIn(int(re.search(r"\d+", actual[-2]).group()), range(rec_limit-60, rec_limit))
# Check a known (limited) number of recursive invocations
def g(count=10):
if count:
return g(count-1)
raise ValueError
with captured_output("stderr") as stderr_g:
try:
g()
except ValueError:
render_exc()
else:
self.fail("no value error was raised")
lineno_g = g.__code__.co_firstlineno
result_g = (
f' File "{__file__}", line {lineno_g+2}, in g\n'
' return g(count-1)\n'
' ^^^^^^^^^^\n'
f' File "{__file__}", line {lineno_g+2}, in g\n'
' return g(count-1)\n'
' ^^^^^^^^^^\n'
f' File "{__file__}", line {lineno_g+2}, in g\n'
' return g(count-1)\n'
' ^^^^^^^^^^\n'
' [Previous line repeated 7 more times]\n'
f' File "{__file__}", line {lineno_g+3}, in g\n'
' raise ValueError\n'
' ^^^^^^^^^^^^^^^^\n'
'ValueError\n'
)
tb_line = (
'Traceback (most recent call last):\n'
f' File "{__file__}", line {lineno_g+7}, in _check_recursive_traceback_display\n'
' g()\n'
' ^^^\n'
)
expected = (tb_line + result_g).splitlines()
actual = stderr_g.getvalue().splitlines()
self.assertEqual(actual, expected)
# Check 2 different repetitive sections
def h(count=10):
if count:
return h(count-1)
g()
with captured_output("stderr") as stderr_h:
try:
h()
except ValueError:
render_exc()
else:
self.fail("no value error was raised")
lineno_h = h.__code__.co_firstlineno
result_h = (
'Traceback (most recent call last):\n'
f' File "{__file__}", line {lineno_h+7}, in _check_recursive_traceback_display\n'
' h()\n'
' ^^^\n'
f' File "{__file__}", line {lineno_h+2}, in h\n'
' return h(count-1)\n'
' ^^^^^^^^^^\n'
f' File "{__file__}", line {lineno_h+2}, in h\n'
' return h(count-1)\n'
' ^^^^^^^^^^\n'
f' File "{__file__}", line {lineno_h+2}, in h\n'
' return h(count-1)\n'
' ^^^^^^^^^^\n'
' [Previous line repeated 7 more times]\n'
f' File "{__file__}", line {lineno_h+3}, in h\n'
' g()\n'
' ^^^\n'
)
expected = (result_h + result_g).splitlines()
actual = stderr_h.getvalue().splitlines()
self.assertEqual(actual, expected)
# Check the boundary conditions. First, test just below the cutoff.
with captured_output("stderr") as stderr_g:
try:
g(traceback._RECURSIVE_CUTOFF)
except ValueError:
render_exc()
else:
self.fail("no error raised")
result_g = (
f' File "{__file__}", line {lineno_g+2}, in g\n'
' return g(count-1)\n'
' ^^^^^^^^^^\n'
f' File "{__file__}", line {lineno_g+2}, in g\n'
' return g(count-1)\n'
' ^^^^^^^^^^\n'
f' File "{__file__}", line {lineno_g+2}, in g\n'
' return g(count-1)\n'
' ^^^^^^^^^^\n'
f' File "{__file__}", line {lineno_g+3}, in g\n'
' raise ValueError\n'
' ^^^^^^^^^^^^^^^^\n'
'ValueError\n'
)
tb_line = (
'Traceback (most recent call last):\n'
f' File "{__file__}", line {lineno_g+81}, in _check_recursive_traceback_display\n'
' g(traceback._RECURSIVE_CUTOFF)\n'
' ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^\n'
)
expected = (tb_line + result_g).splitlines()
actual = stderr_g.getvalue().splitlines()
self.assertEqual(actual, expected)
# Second, test just above the cutoff.
with captured_output("stderr") as stderr_g:
try:
g(traceback._RECURSIVE_CUTOFF + 1)
except ValueError:
render_exc()
else:
self.fail("no error raised")
result_g = (
f' File "{__file__}", line {lineno_g+2}, in g\n'
' return g(count-1)\n'
' ^^^^^^^^^^\n'
f' File "{__file__}", line {lineno_g+2}, in g\n'
' return g(count-1)\n'
' ^^^^^^^^^^\n'
f' File "{__file__}", line {lineno_g+2}, in g\n'
' return g(count-1)\n'
' ^^^^^^^^^^\n'
' [Previous line repeated 1 more time]\n'
f' File "{__file__}", line {lineno_g+3}, in g\n'