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
|
"""Test cases for traceback module"""
from _testcapi import traceback_print
from StringIO import StringIO
import sys
import unittest
from imp import reload
from test.test_support import run_unittest, is_jython, Error
import traceback
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, 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_without_caret(self):
# XXX why doesn't compile raise the same traceback?
import test.badsyntax_nocaret
def syntax_error_bad_indentation(self):
compile("def spam():\n print 1\n print 2", "?", "exec")
def test_caret(self):
err = self.get_exception_format(self.syntax_error_with_caret,
SyntaxError)
self.assertTrue(len(err) == 4)
self.assertTrue(err[1].strip() == "return x!")
self.assertIn("^", err[2]) # third line has caret
self.assertTrue(err[1].find("!") == err[2].find("^")) # in the right place
err = self.get_exception_format(self.syntax_error_with_caret_2,
SyntaxError)
self.assertIn("^", err[2]) # third line has caret
self.assertTrue(err[2].count('\n') == 1) # and no additional newline
self.assertTrue(err[1].find("+") == err[2].find("^")) # in the right place
def test_nocaret(self):
if is_jython:
# jython adds a caret in this case (why shouldn't it?)
return
err = self.get_exception_format(self.syntax_error_without_caret,
SyntaxError)
self.assertTrue(len(err) == 3)
self.assertTrue(err[1].strip() == "[x for x in x] = x")
def test_bad_indentation(self):
err = self.get_exception_format(self.syntax_error_bad_indentation,
IndentationError)
self.assertTrue(len(err) == 4)
self.assertTrue(err[1].strip() == "print 2")
self.assertIn("^", err[2])
self.assertTrue(err[1].find("2") == err[2].find("^"))
def test_bug737473(self):
import os, tempfile, time
savedpath = sys.path[:]
testdir = tempfile.mkdtemp()
try:
sys.path.insert(0, testdir)
testfile = os.path.join(testdir, 'test_bug737473.py')
print >> open(testfile, 'w'), """
def test():
raise ValueError"""
if 'test_bug737473' in sys.modules:
del sys.modules['test_bug737473']
import test_bug737473
try:
test_bug737473.test()
except ValueError:
# this loads source code to linecache
traceback.extract_tb(sys.exc_traceback)
# If this test runs too quickly, test_bug737473.py's mtime
# attribute will remain unchanged even if the file is rewritten.
# Consequently, the file would not reload. So, added a sleep()
# delay to assure that a new, distinct timestamp is written.
# Since WinME with FAT32 has multisecond resolution, more than
# three seconds are needed for this test to pass reliably :-(
time.sleep(4)
print >> open(testfile, 'w'), """
def test():
raise NotImplementedError"""
reload(test_bug737473)
try:
test_bug737473.test()
except NotImplementedError:
src = traceback.extract_tb(sys.exc_traceback)[-1][-1]
self.assertEqual(src, 'raise NotImplementedError')
finally:
sys.path[:] = savedpath
for f in os.listdir(testdir):
os.unlink(os.path.join(testdir, f))
os.rmdir(testdir)
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'])
# String exceptions are deprecated, but legal. The quirky form with
# separate "type" and "value" tends to break things, because
# not isinstance(value, type)
# and a string cannot be the first argument to issubclass.
#
# Note that sys.last_type and sys.last_value do not get set if an
# exception is caught, so we sort of cheat and just emulate them.
#
# test_string_exception1 is equivalent to
#
# >>> raise "String Exception"
#
# test_string_exception2 is equivalent to
#
# >>> raise "String Exception", "String Value"
#
def test_string_exception1(self):
str_type = "String Exception"
err = traceback.format_exception_only(str_type, None)
self.assertEqual(len(err), 1)
self.assertEqual(err[0], str_type + '\n')
def test_string_exception2(self):
str_type = "String Exception"
str_value = "String Value"
err = traceback.format_exception_only(str_type, str_value)
self.assertEqual(len(err), 1)
self.assertEqual(err[0], str_type + ': ' + str_value + '\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 = '<unprintable %s object>' % X.__name__
self.assertEqual(err[0], X.__name__ + ': ' + str_value + '\n')
def test_without_exception(self):
err = traceback.format_exception_only(None, None)
self.assertEqual(err, ['None\n'])
def test_unicode(self):
err = AssertionError('\xff')
lines = traceback.format_exception_only(type(err), err)
self.assertEqual(lines, ['AssertionError: \xff\n'])
err = AssertionError(u'\xe9')
lines = traceback.format_exception_only(type(err), err)
self.assertEqual(lines, ['AssertionError: \\xe9\n'])
class TracebackFormatTests(unittest.TestCase):
def test_traceback_format(self):
try:
raise KeyError('blah')
except KeyError:
type_, value, tb = sys.exc_info()
traceback_fmt = 'Traceback (most recent call last):\n' + \
''.join(traceback.format_tb(tb))
file_ = StringIO()
traceback_print(tb, file_)
python_fmt = file_.getvalue()
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)
# Make sure that the traceback is properly indented.
tb_lines = python_fmt.splitlines()
self.assertEqual(len(tb_lines), 3)
banner, location, source_line = tb_lines
self.assertTrue(banner.startswith('Traceback'))
self.assertTrue(location.startswith(' File'))
self.assertTrue(source_line.startswith(' raise'))
def test_main():
run_unittest(TracebackCases, TracebackFormatTests)
if __name__ == "__main__":
test_main()
|
