diff --git a/Lib/test/test_complex.py b/Lib/test/test_complex.py
index cee49343e268a2..1980fc4092644e 100644
--- a/Lib/test/test_complex.py
+++ b/Lib/test/test_complex.py
@@ -345,6 +345,9 @@ def split_zeros(x):
self.assertEqual(type(complex("1"*500)), complex)
# check whitespace processing
self.assertEqual(complex('\N{EM SPACE}(\N{EN SPACE}1+1j ) '), 1+1j)
+ # Invalid unicode string
+ # See bpo-34087
+ self.assertRaises(ValueError, complex, '\u3053\u3093\u306b\u3061\u306f')
class EvilExc(Exception):
pass
diff --git a/Lib/test/test_float.py b/Lib/test/test_float.py
index c5ca50c8f71206..61551e5c99031b 100644
--- a/Lib/test/test_float.py
+++ b/Lib/test/test_float.py
@@ -60,6 +60,9 @@ def test_float(self):
# extra long strings should not be a problem
float(b'.' + b'1'*1000)
float('.' + '1'*1000)
+ # Invalid unicode string
+ # See bpo-34087
+ self.assertRaises(ValueError, float, '\u3053\u3093\u306b\u3061\u306f')
def test_underscores(self):
for lit in VALID_UNDERSCORE_LITERALS:
diff --git a/Lib/test/test_long.py b/Lib/test/test_long.py
index fd15f04aceca8f..140ace18dd1e79 100644
--- a/Lib/test/test_long.py
+++ b/Lib/test/test_long.py
@@ -373,6 +373,10 @@ def test_long(self):
for base in invalid_bases:
self.assertRaises(ValueError, int, '42', base)
+ # Invalid unicode string
+ # See bpo-34087
+ self.assertRaises(ValueError, int, '\u3053\u3093\u306b\u3061\u306f')
+
def test_conversion(self):
diff --git a/Python/pystrtod.c b/Python/pystrtod.c
index 64d0c52e487958..58278c24be9c28 100644
--- a/Python/pystrtod.c
+++ b/Python/pystrtod.c
@@ -391,6 +391,8 @@ _Py_string_to_number_with_underscores(
char *dup, *end;
PyObject *result;
+ assert(s[orig_len] == '\0');
+
if (strchr(s, '_') == NULL) {
return innerfunc(s, orig_len, arg);
}
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