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test_traceback.py
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test_traceback.py
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"""Test cases for traceback module"""
from collections import namedtuple
from io import StringIO
import linecache
import sys
import types
import inspect
import builtins
import unittest
import re
import tempfile
import random
import string
from test import support
import shutil
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
from test.support.import_helper import forget
import json
import textwrap
import traceback
from functools import partial
from pathlib import Path
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'])
LEVENSHTEIN_DATA_FILE = Path(__file__).parent / 'levenshtein_examples.json'
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]
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 as e:
self.exc = e
# self.exc.__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)
# 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>)')
class PurePythonExceptionFormattingMixin:
def get_exception(self, callable, slice_start=0, slice_end=-1):
try:
callable()
self.fail("No exception thrown.")
except:
return traceback.format_exc().splitlines()[slice_start:slice_end]
callable_line = get_exception.__code__.co_firstlineno + 2
class CAPIExceptionFormattingMixin:
LEGACY = 0
def get_exception(self, callable, slice_start=0, slice_end=-1):
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, self.LEGACY)
return tbstderr.getvalue().splitlines()[slice_start:slice_end]
callable_line = get_exception.__code__.co_firstlineno + 3
class CAPIExceptionFormattingLegacyMixin(CAPIExceptionFormattingMixin):
LEGACY = 1
@requires_debug_ranges()
class TracebackErrorLocationCaretTestBase:
"""
Tests for printing code error expressions as part of PEP 657
"""
def test_basic_caret(self):
# NOTE: In caret tests, "if True:" is used as a way to force indicator
# display, since the raising expression spans only part of the line.
def f():
if True: 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'
f' File "{__file__}", line {lineno_f+1}, in f\n'
' if True: 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():
if True: 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'
f' File "{__file__}", line {lineno_f+1}, in f_with_unicode\n'
' if True: 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'
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():
if True: 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'
f' File "{__file__}", line {lineno_f+1}, in f_with_multiline\n'
' if True: 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'
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 (
2 + 1 /
0
)
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'
f' File "{__file__}", line {lineno_f+2}, in f_with_multiline\n'
' 2 + 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'
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_with_unicode(self):
def f_with_binary_operator():
áóí = 20
return 10 + áóí / 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'
f' File "{__file__}", line {lineno_f+2}, in f_with_binary_operator\n'
' return 10 + áóí / 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'
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_with_spaces_and_parenthesis(self):
def f_with_binary_operator():
a = 1
b = ""
return ( a ) + b
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'
f' File "{__file__}", line {lineno_f+3}, in f_with_binary_operator\n'
' return ( a ) + b\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'
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_caret_for_subscript_unicode(self):
def f_with_subscript():
some_dict = {'ó': {'á': {'í': {'theta': 1}}}}
return some_dict['ó']['á']['í']['beta']
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'
f' File "{__file__}", line {lineno_f+2}, in f_with_subscript\n'
" return some_dict['ó']['á']['í']['beta']\n"
' ~~~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^\n'
)
result_lines = self.get_exception(f_with_subscript)
self.assertEqual(result_lines, expected_error.splitlines())
def test_caret_for_subscript_with_spaces_and_parenthesis(self):
def f_with_binary_operator():
a = []
b = c = 1
return b [ a ] + c
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'
f' File "{__file__}", line {lineno_f+3}, in f_with_binary_operator\n'
' return b [ a ] + c\n'
' ~~~~~~^^^^^^^^^\n'
)
result_lines = self.get_exception(f_with_binary_operator)
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'
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 = "if True: " + "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'
f' File "{TESTFN}", line {lineno_f}, in <module>\n'
f' {source}\n'
f' {" "*len("if True: ") + "^"*256}\n'
)
self.assertEqual(result_lines, expected_error.splitlines())
def test_secondary_caret_not_elided(self):
# Always show a line's indicators if they include the secondary character.
def f_with_subscript():
some_dict = {'x': {'y': None}}
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'
f' File "{__file__}", line {lineno_f+2}, in f_with_subscript\n'
" some_dict['x']['y']['z']\n"
' ~~~~~~~~~~~~~~~~~~~^^^^^\n'
)
result_lines = self.get_exception(f_with_subscript)
self.assertEqual(result_lines, expected_error.splitlines())
def test_caret_exception_group(self):
# Notably, this covers whether indicators handle margin strings correctly.
# (Exception groups use margin strings to display vertical indicators.)
# The implementation must account for both "indent" and "margin" offsets.
def exc():
if True: raise ExceptionGroup("eg", [ValueError(1), TypeError(2)])
expected_error = (
f' + Exception Group Traceback (most recent call last):\n'
f' | File "{__file__}", line {self.callable_line}, in get_exception\n'
f' | callable()\n'
f' | File "{__file__}", line {exc.__code__.co_firstlineno + 1}, in exc\n'
f' | if True: raise ExceptionGroup("eg", [ValueError(1), TypeError(2)])\n'
f' | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^\n'
f' | ExceptionGroup: eg (2 sub-exceptions)\n'
f' +-+---------------- 1 ----------------\n'
f' | ValueError: 1\n'
f' +---------------- 2 ----------------\n'
f' | TypeError: 2\n')
result_lines = self.get_exception(exc)
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'
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'
)
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'
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'
)
self.assertEqual(result_lines, expected_error.splitlines())
def test_multiline_method_call_a(self):
def f():
(None
.method
)()
actual = self.get_exception(f)
expected = [
"Traceback (most recent call last):",
f" File \"{__file__}\", line {self.callable_line}, in get_exception",
" callable()",
f" File \"{__file__}\", line {f.__code__.co_firstlineno + 2}, in f",
" .method",
" ^^^^^^",
]
self.assertEqual(actual, expected)
def test_multiline_method_call_b(self):
def f():
(None.
method
)()
actual = self.get_exception(f)
expected = [
"Traceback (most recent call last):",
f" File \"{__file__}\", line {self.callable_line}, in get_exception",
" callable()",
f" File \"{__file__}\", line {f.__code__.co_firstlineno + 2}, in f",
" method",
]
self.assertEqual(actual, expected)
def test_multiline_method_call_c(self):
def f():
(None
. method
)()
actual = self.get_exception(f)
expected = [
"Traceback (most recent call last):",
f" File \"{__file__}\", line {self.callable_line}, in get_exception",
" callable()",
f" File \"{__file__}\", line {f.__code__.co_firstlineno + 2}, in f",
" . method",
" ^^^^^^",
]
self.assertEqual(actual, expected)
def test_wide_characters_unicode_with_problematic_byte_offset(self):
def f():
ｗｉｄｔｈ
actual = self.get_exception(f)
expected = [
"Traceback (most recent call last):",
f" File \"{__file__}\", line {self.callable_line}, in get_exception",
" callable()",
f" File \"{__file__}\", line {f.__code__.co_firstlineno + 1}, in f",
" ｗｉｄｔｈ",
]
self.assertEqual(actual, expected)
def test_byte_offset_with_wide_characters_middle(self):
def f():
ｗｉｄｔｈ = 1
raise ValueError(ｗｉｄｔｈ)
actual = self.get_exception(f)
expected = [
"Traceback (most recent call last):",
f" File \"{__file__}\", line {self.callable_line}, in get_exception",
" callable()",
f" File \"{__file__}\", line {f.__code__.co_firstlineno + 2}, in f",
" raise ValueError(ｗｉｄｔｈ)",
]
self.assertEqual(actual, expected)
def test_byte_offset_multiline(self):
def f():
ｗｗｗ = 1
ｔｈ = 0
print(1, ｗｗｗ(
ｔｈ))
actual = self.get_exception(f)
expected = [
"Traceback (most recent call last):",
f" File \"{__file__}\", line {self.callable_line}, in get_exception",
" callable()",
f" File \"{__file__}\", line {f.__code__.co_firstlineno + 4}, in f",
" print(1, ｗｗｗ(",
" ^^^^",
]
self.assertEqual(actual, expected)
def test_memory_error(self):
def f():
raise MemoryError()
actual = self.get_exception(f)
expected = ['Traceback (most recent call last):',
f' File "{__file__}", line {self.callable_line}, in get_exception',
' callable()',
f' File "{__file__}", line {f.__code__.co_firstlineno + 1}, in f',
' raise MemoryError()']
self.assertEqual(actual, expected)
@requires_debug_ranges()
class PurePythonTracebackErrorCaretTests(
PurePythonExceptionFormattingMixin,
TracebackErrorLocationCaretTestBase,
unittest.TestCase,
):
"""
Same set of tests as above using the pure Python implementation of
traceback printing in traceback.py.
"""
@cpython_only
@requires_debug_ranges()
class CPythonTracebackErrorCaretTests(
CAPIExceptionFormattingMixin,
TracebackErrorLocationCaretTestBase,
unittest.TestCase,
):
"""
Same set of tests as above but with Python's internal traceback printing.
"""
@cpython_only
@requires_debug_ranges()
class CPythonTracebackLegacyErrorCaretTests(
CAPIExceptionFormattingLegacyMixin,
TracebackErrorLocationCaretTestBase,
unittest.TestCase,
):
"""
Same set of tests as above but with Python's legacy internal traceback printing.
"""
class TracebackFormatMixin:
DEBUG_RANGES = True
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 as e:
tb = e.__traceback__
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: