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Issue 28128: Print out better error/warning messages for invalid string escapes.

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This commit is contained in:
Eric V. Smith 2016-10-31 09:22:08 -04:00
parent a99cdb21a7
commit 42454af094
8 changed files with 173 additions and 22 deletions
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27
Lib/test/test_string_literals.py
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@ -31,6 +31,7 @@ import os
import sys
import shutil
import tempfile
import warnings
import unittest
@ -104,6 +105,19 @@ class TestLiterals(unittest.TestCase):
self.assertRaises(SyntaxError, eval, r""" '\U000000' """)
self.assertRaises(SyntaxError, eval, r""" '\U0000000' """)
def test_eval_str_invalid_escape(self):
for b in range(1, 128):
if b in b"""\n\r"'01234567NU\\abfnrtuvx""":
continue
with self.assertWarns(DeprecationWarning):
self.assertEqual(eval(r"'\%c'" % b), '\\' + chr(b))
with warnings.catch_warnings(record=True) as w:
warnings.simplefilter('always', category=DeprecationWarning)
eval("'''\n\\z'''")
self.assertEqual(len(w), 1)
self.assertEqual(w[0].filename, '<string>')
self.assertEqual(w[0].lineno, 2)
def test_eval_str_raw(self):
self.assertEqual(eval(""" r'x' """), 'x')
self.assertEqual(eval(r""" r'\x01' """), '\\' + 'x01')
@ -130,6 +144,19 @@ class TestLiterals(unittest.TestCase):
self.assertRaises(SyntaxError, eval, r""" b'\x' """)
self.assertRaises(SyntaxError, eval, r""" b'\x0' """)
def test_eval_bytes_invalid_escape(self):
for b in range(1, 128):
if b in b"""\n\r"'01234567\\abfnrtvx""":
continue
with self.assertWarns(DeprecationWarning):
self.assertEqual(eval(r"b'\%c'" % b), b'\\' + bytes([b]))
with warnings.catch_warnings(record=True) as w:
warnings.simplefilter('always', category=DeprecationWarning)
eval("b'''\n\\z'''")
self.assertEqual(len(w), 1)
self.assertEqual(w[0].filename, '<string>')
self.assertEqual(w[0].lineno, 2)
def test_eval_bytes_raw(self):
self.assertEqual(eval(""" br'x' """), b'x')
self.assertEqual(eval(""" rb'x' """), b'x')