Issue #20424: Python implementation of io.StringIO now supports lone surrogates.
diff --git a/Lib/_pyio.py b/Lib/_pyio.py
index aab60db..a9b0064 100644
--- a/Lib/_pyio.py
+++ b/Lib/_pyio.py
@@ -2044,7 +2044,7 @@
def __init__(self, initial_value="", newline="\n"):
super(StringIO, self).__init__(BytesIO(),
encoding="utf-8",
- errors="strict",
+ errors="surrogatepass",
newline=newline)
# Issue #5645: make universal newlines semantics the same as in the
# C version, even under Windows.
diff --git a/Lib/test/test_memoryio.py b/Lib/test/test_memoryio.py
index d611a31..50c91ab 100644
--- a/Lib/test/test_memoryio.py
+++ b/Lib/test/test_memoryio.py
@@ -609,6 +609,15 @@
UnsupportedOperation = pyio.UnsupportedOperation
EOF = ""
+ def test_lone_surrogates(self):
+ # Issue #20424
+ memio = self.ioclass('\ud800')
+ self.assertEqual(memio.read(), '\ud800')
+
+ memio = self.ioclass()
+ memio.write('\ud800')
+ self.assertEqual(memio.getvalue(), '\ud800')
+
class PyStringIOPickleTest(TextIOTestMixin, unittest.TestCase):
"""Test if pickle restores properly the internal state of StringIO.
diff --git a/Misc/NEWS b/Misc/NEWS
index c52ca18..8b24dc3 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -50,6 +50,8 @@
Library
-------
+- Issue #20424: Python implementation of io.StringIO now supports lone surrogates.
+
- Issue #19456: ntpath.join() now joins relative paths correctly when a drive
is present.