[3.6] bpo-29104: Fixed parsing backslashes in f-strings. (GH-490) (#1812)
(cherry picked from commit 0cd7a3f)
diff --git a/Lib/test/test_fstring.py b/Lib/test/test_fstring.py
index 708ed25..2573002 100644
--- a/Lib/test/test_fstring.py
+++ b/Lib/test/test_fstring.py
@@ -361,6 +361,20 @@
self.assertEqual(f'2\x203', '2 3')
self.assertEqual(f'\x203', ' 3')
+ with self.assertWarns(DeprecationWarning): # invalid escape sequence
+ value = eval(r"f'\{6*7}'")
+ self.assertEqual(value, '\\42')
+ self.assertEqual(f'\\{6*7}', '\\42')
+ self.assertEqual(fr'\{6*7}', '\\42')
+
+ AMPERSAND = 'spam'
+ # Get the right unicode character (&), or pick up local variable
+ # depending on the number of backslashes.
+ self.assertEqual(f'\N{AMPERSAND}', '&')
+ self.assertEqual(f'\\N{AMPERSAND}', '\\Nspam')
+ self.assertEqual(fr'\N{AMPERSAND}', '\\Nspam')
+ self.assertEqual(f'\\\N{AMPERSAND}', '\\&')
+
def test_misformed_unicode_character_name(self):
# These test are needed because unicode names are parsed
# differently inside f-strings.