diff --git a/gnu/local.mk b/gnu/local.mk
index 18a2389514..e236a8ffa3 100644
--- a/gnu/local.mk
+++ b/gnu/local.mk
@@ -1514,6 +1514,7 @@ dist_patch_DATA =						\
   %D%/packages/patches/python-3-search-paths.patch		\
   %D%/packages/patches/python-3-fix-tests.patch			\
   %D%/packages/patches/python-3.8-fix-tests.patch		\
+  %D%/packages/patches/python-3.9-fix-tests.patch		\
   %D%/packages/patches/python-CVE-2018-14647.patch		\
   %D%/packages/patches/python-aionotify-0.2.0-py3.8.patch	\
   %D%/packages/patches/python-argcomplete-1.11.1-fish31.patch	\
diff --git a/gnu/packages/patches/python-3.9-fix-tests.patch b/gnu/packages/patches/python-3.9-fix-tests.patch
new file mode 100644
index 0000000000..dc6b8c4cc8
--- /dev/null
+++ b/gnu/packages/patches/python-3.9-fix-tests.patch
@@ -0,0 +1,370 @@
+See the discussion about the issues fixed here at:
+http://bugs.python.org/issue20868 .
+
+diff --git a/Lib/ctypes/test/test_callbacks.py b/Lib/ctypes/test/test_callbacks.py
+--- a/Lib/ctypes/test/test_callbacks.py
++++ b/Lib/ctypes/test/test_callbacks.py
+@@ -3,6 +3,7 @@ import unittest
+ from ctypes import *
+ from ctypes.test import need_symbol
+ import _ctypes_test
++import platform
+
+ class Callbacks(unittest.TestCase):
+     functype = CFUNCTYPE
+@@ -176,6 +177,8 @@ class SampleCallbacksTestCase(unittest.TestCase):
+
+         self.assertLess(diff, 0.01, "%s not less than 0.01" % diff)
+
++    @unittest.skipIf(platform.machine() in ['mips64'],
++                     "This test fails on this platform")
+     def test_issue_8959_a(self):
+         from ctypes.util import find_library
+         libc_path = find_library("c")
+diff --git a/Lib/ctypes/test/test_libc.py b/Lib/ctypes/test/test_libc.py
+--- a/Lib/ctypes/test/test_libc.py
++++ b/Lib/ctypes/test/test_libc.py
+@@ -2,6 +2,7 @@ import unittest
+
+ from ctypes import *
+ import _ctypes_test
++import platform
+
+ lib = CDLL(_ctypes_test.__file__)
+
+@@ -17,6 +18,8 @@ class LibTest(unittest.TestCase):
+         import math
+         self.assertEqual(lib.my_sqrt(2.0), math.sqrt(2.0))
+
++    @unittest.skipIf(platform.machine() in ['mips64'],
++                     "This test fails on this platform")
+     def test_qsort(self):
+         comparefunc = CFUNCTYPE(c_int, POINTER(c_char), POINTER(c_char))
+         lib.my_qsort.argtypes = c_void_p, c_size_t, c_size_t, comparefunc
+diff --git a/Lib/distutils/tests/test_archive_util.py b/Lib/distutils/tests/test_archive_util.py
+--- a/Lib/distutils/tests/test_archive_util.py
++++ b/Lib/distutils/tests/test_archive_util.py
+@@ -333,6 +333,7 @@ class ArchiveUtilTestCase(support.TempdirManager,
+         self.assertEqual(os.path.basename(res), 'archive.tar.xz')
+         self.assertEqual(self._tarinfo(res), self._created_files)
+
++    @unittest.skipIf(True, "getgrgid(0)[0] raises a KeyError on Guix")
+     def test_make_archive_owner_group(self):
+         # testing make_archive with owner and group, with various combinations
+         # this works even if there's not gid/uid support
+@@ -362,6 +363,7 @@ class ArchiveUtilTestCase(support.TempdirManager,
+
+     @unittest.skipUnless(ZLIB_SUPPORT, "Requires zlib")
+     @unittest.skipUnless(UID_GID_SUPPORT, "Requires grp and pwd support")
++    @unittest.skipIf(True, "getgrgid(0)[0] raises a KeyError on Guix")
+     def test_tarfile_root_owner(self):
+         tmpdir =  self._create_files()
+         base_name = os.path.join(self.mkdtemp(), 'archive')
+diff --git a/Lib/distutils/tests/test_sdist.py b/Lib/distutils/tests/test_sdist.py
+--- a/Lib/distutils/tests/test_sdist.py
++++ b/Lib/distutils/tests/test_sdist.py
+@@ -443,6 +443,7 @@ class SDistTestCase(BasePyPIRCCommandTestCase):
+                      "The tar command is not found")
+     @unittest.skipIf(find_executable('gzip') is None,
+                      "The gzip command is not found")
++    @unittest.skipIf(True, "getgrgid(0)[0] raises a KeyError on Guix")
+     def test_make_distribution_owner_group(self):
+         # now building a sdist
+         dist, cmd = self.get_cmd()
+diff --git a/Lib/test/_test_multiprocessing.py b/Lib/test/_test_multiprocessing.py
+--- a/Lib/test/_test_multiprocessing.py
++++ b/Lib/test/_test_multiprocessing.py
+@@ -1473,6 +1473,7 @@ class _TestCondition(BaseTestCase):
+         if pid is not None:
+             os.kill(pid, signal.SIGINT)
+
++    @unittest.skipIf(True, "This fails for unknown reasons on Guix")
+     def test_wait_result(self):
+         if isinstance(self, ProcessesMixin) and sys.platform != 'win32':
+             pid = os.getpid()
+diff --git a/Lib/test/test_asyncio/test_base_events.py b/Lib/test/test_asyncio/test_base_events.py
+--- a/Lib/test/test_asyncio/test_base_events.py
++++ b/Lib/test/test_asyncio/test_base_events.py
+@@ -1323,6 +1323,8 @@ class BaseEventLoopWithSelectorTests(test_utils.TestCase):
+         self._test_create_connection_ip_addr(m_socket, False)
+
+     @patch_socket
++    @unittest.skipUnless(support.is_resource_enabled('network'),
++                         'network is not enabled')
+     def test_create_connection_service_name(self, m_socket):
+         m_socket.getaddrinfo = socket.getaddrinfo
+         sock = m_socket.socket.return_value
+diff --git a/Lib/test/test_generators.py b/Lib/test/test_generators.py
+--- a/Lib/test/test_generators.py
++++ b/Lib/test/test_generators.py
+@@ -34,6 +34,7 @@ class SignalAndYieldFromTest(unittest.TestCase):
+         else:
+             return "FAILED"
+
++    @unittest.skipIf(True, 'Keyboard interrupts do not work in the Guix build environment')
+     def test_raise_and_yield_from(self):
+         gen = self.generator1()
+         gen.send(None)
+diff --git a/Lib/test/test_pathlib.py b/Lib/test/test_pathlib.py
+--- a/Lib/test/test_pathlib.py
++++ b/Lib/test/test_pathlib.py
+@@ -2134,8 +2134,7 @@ class PosixPathTest(_BasePathTest, unittest.TestCase):
+         self.assertEqual(given, expect)
+         self.assertEqual(set(p.rglob("FILEd*")), set())
+
+-    @unittest.skipUnless(hasattr(pwd, 'getpwall'),
+-                         'pwd module does not expose getpwall()')
++    @unittest.skipIf(True, "Guix builder home is '/' which causes trouble for these tests")
+     def test_expanduser(self):
+         P = self.cls
+         support.import_module('pwd')
+diff --git a/Lib/test/test_pdb.py b/Lib/test/test_pdb.py
+--- a/Lib/test/test_pdb.py
++++ b/Lib/test/test_pdb.py
+@@ -1150,11 +1150,11 @@ def test_pdb_issue_20766():
+     > <doctest test.test_pdb.test_pdb_issue_20766[0]>(6)test_function()
+     -> print('pdb %d: %s' % (i, sess._previous_sigint_handler))
+     (Pdb) continue
+-    pdb 1: <built-in function default_int_handler>
++    pdb 1: Handlers.SIG_IGN
+     > <doctest test.test_pdb.test_pdb_issue_20766[0]>(5)test_function()
+     -> sess.set_trace(sys._getframe())
+     (Pdb) continue
+-    pdb 2: <built-in function default_int_handler>
++    pdb 2: Handlers.SIG_IGN
+     """
+
+
+diff --git a/Lib/test/test_regrtest.py b/Lib/test/test_regrtest.py
+--- a/Lib/test/test_regrtest.py
++++ b/Lib/test/test_regrtest.py
+@@ -762,6 +762,7 @@ class ArgsTestCase(BaseTestCase):
+         output = self.run_tests('--fromfile', filename)
+         self.check_executed_tests(output, tests)
+
++    @unittest.skipIf(True, 'Keyboard interrupts do not work in the Guix build environment.')
+     def test_interrupted(self):
+         code = TEST_INTERRUPTED
+         test = self.create_test('sigint', code=code)
+@@ -779,6 +780,7 @@ class ArgsTestCase(BaseTestCase):
+                  % (self.TESTNAME_REGEX, len(tests)))
+         self.check_line(output, regex)
+
++    @unittest.skipIf(True, 'Keyboard interrupts do not work in the Guix build environment.')
+     def test_slowest_interrupted(self):
+         # Issue #25373: test --slowest with an interrupted test
+         code = TEST_INTERRUPTED
+diff --git a/Lib/test/test_resource.py b/Lib/test/test_resource.py
+--- a/Lib/test/test_resource.py
++++ b/Lib/test/test_resource.py
+@@ -145,6 +145,7 @@ class ResourceTest(unittest.TestCase):
+
+     @unittest.skipUnless(hasattr(resource, 'prlimit'), 'no prlimit')
+     @support.requires_linux_version(2, 6, 36)
++    @unittest.skipIf(True, "Bug: the PermissionError is not raised")
+     def test_prlimit(self):
+         self.assertRaises(TypeError, resource.prlimit)
+         self.assertRaises(ProcessLookupError, resource.prlimit,
+diff --git a/Lib/test/test_shutil.py b/Lib/test/test_shutil.py
+--- a/Lib/test/test_shutil.py
++++ b/Lib/test/test_shutil.py
+@@ -1428,6 +1428,7 @@ class TestArchives(BaseTest, unittest.TestCase):
+         self.assertRaises(ValueError, make_archive, base_name, 'xxx')
+
+     @support.requires_zlib()
++    @unittest.skipIf(True, "getgrgid(0)[0] raises a KeyError on Guix")
+     def test_make_archive_owner_group(self):
+         # testing make_archive with owner and group, with various combinations
+         # this works even if there's not gid/uid support
+@@ -1456,6 +1457,7 @@ class TestArchives(BaseTest, unittest.TestCase):
+
+
+     @support.requires_zlib()
++    @unittest.skipIf(True, "getgrgid(0)[0] raises a KeyError on Guix")
+     @unittest.skipUnless(UID_GID_SUPPORT, "Requires grp and pwd support")
+     def test_tarfile_root_owner(self):
+         root_dir, base_dir = self._create_files()
+diff --git a/Lib/test/test_unicodedata.py b/Lib/test/test_unicodedata.py
+--- a/Lib/test/test_unicodedata.py
++++ b/Lib/test/test_unicodedata.py
+@@ -320,6 +320,7 @@ class NormalizationTest(unittest.TestCase):
+         data = [int(x, 16) for x in data.split(" ")]
+         return "".join([chr(x) for x in data])
+
++    @unittest.skipIf(True, 'Network is not available in the Guix build environment')
+     def test_normalization(self):
+         TESTDATAFILE = "NormalizationTest.txt"
+         TESTDATAURL = f"http://www.pythontest.net/unicode/{unicodedata.unidata_version}/{TESTDATAFILE}"
+diff --git a/Lib/test/test_socket.py b/Lib/test/test_socket.py
+--- a/Lib/test/test_socket.py
++++ b/Lib/test/test_socket.py
+@@ -875,6 +875,8 @@ class GeneralModuleTests(unittest.TestCase):
+         if not fqhn in all_host_names:
+             self.fail("Error testing host resolution mechanisms. (fqdn: %s, all: %s)" % (fqhn, repr(all_host_names)))
+
++    @unittest.skipUnless(support.is_resource_enabled('network'),
++                         'network is not enabled')
+     def test_host_resolution(self):
+         for addr in [support.HOSTv4, '10.0.0.1', '255.255.255.255']:
+             self.assertEqual(socket.gethostbyname(addr), addr)
+@@ -1004,6 +1006,8 @@ class GeneralModuleTests(unittest.TestCase):
+             self.assertWarns(DeprecationWarning, socket.ntohs, k)
+             self.assertWarns(DeprecationWarning, socket.htons, k)
+
++    @unittest.skipUnless(os.path.exists("/etc/services"),
++                         "getservbyname uses /etc/services, which is not in the chroot")
+     def testGetServBy(self):
+         eq = self.assertEqual
+         # Find one service that exists, then check all the related interfaces.
+@@ -1358,6 +1362,8 @@ class GeneralModuleTests(unittest.TestCase):
+             raise
+         self.assertRaises(TypeError, s.ioctl, socket.SIO_LOOPBACK_FAST_PATH, None)
+
++    @unittest.skipUnless(os.path.exists("/etc/gai.conf"),
++                         "getaddrinfo() will fail")
+     def testGetaddrinfo(self):
+         try:
+             socket.getaddrinfo('localhost', 80)
+@@ -1440,6 +1446,8 @@ class GeneralModuleTests(unittest.TestCase):
+         # only IP addresses are allowed
+         self.assertRaises(OSError, socket.getnameinfo, ('mail.python.org',0), 0)
+
++    @unittest.skipUnless(os.path.exists("/etc/gai.conf"),
++                         "getaddrinfo() will fail")
+     @unittest.skipUnless(support.is_resource_enabled('network'),
+                          'network is not enabled')
+     def test_idna(self):
+diff --git a/Lib/test/test_spwd.py b/Lib/test/test_spwd.py
+--- a/Lib/test/test_spwd.py
++++ b/Lib/test/test_spwd.py
+@@ -5,8 +5,7 @@ from test import support
+ spwd = support.import_module('spwd')
+
+
+-@unittest.skipUnless(hasattr(os, 'geteuid') and os.geteuid() == 0,
+-                     'root privileges required')
++@unittest.skipUnless(os.path.exists("/etc/shadow"), 'spwd tests require /etc/shadow')
+ class TestSpwdRoot(unittest.TestCase):
+
+     def test_getspall(self):
+@@ -56,8 +55,7 @@ class TestSpwdRoot(unittest.TestCase):
+             self.assertRaises(TypeError, spwd.getspnam, bytes_name)
+
+
+-@unittest.skipUnless(hasattr(os, 'geteuid') and os.geteuid() != 0,
+-                     'non-root user required')
++@unittest.skipUnless(os.path.exists("/etc/shadow"), 'spwd tests require /etc/shadow')
+ class TestSpwdNonRoot(unittest.TestCase):
+
+     def test_getspnam_exception(self):
+diff --git a/Lib/test/test_tarfile.py b/Lib/test/test_tarfile.py
+--- a/Lib/test/test_tarfile.py
++++ b/Lib/test/test_tarfile.py
+@@ -2509,9 +2509,12 @@ def root_is_uid_gid_0():
+         import pwd, grp
+     except ImportError:
+         return False
+-    if pwd.getpwuid(0)[0] != 'root':
+-        return False
+-    if grp.getgrgid(0)[0] != 'root':
++    try:
++        if pwd.getpwuid(0)[0] != 'root':
++            return False
++        if grp.getgrgid(0)[0] != 'root':
++            return False
++    except KeyError:
+         return False
+     return True
+
+diff --git a/Lib/test/test_threading.py b/Lib/test/test_threading.py
+--- a/Lib/test/test_threading.py
++++ b/Lib/test/test_threading.py
+@@ -1249,6 +1249,7 @@ class MiscTestCase(unittest.TestCase):
+
+
+ class InterruptMainTests(unittest.TestCase):
++    @unittest.skipIf(True, 'Keyboard interrupts do not work in the Guix build container.')
+     def test_interrupt_main_subthread(self):
+         # Calling start_new_thread with a function that executes interrupt_main
+         # should raise KeyboardInterrupt upon completion.
+@@ -1260,6 +1261,8 @@ class InterruptMainTests(unittest.TestCase):
+             t.join()
+         t.join()
+
++
++    @unittest.skipIf(True, 'Keyboard interrupts do not work in the Guix build container.')
+     def test_interrupt_main_mainthread(self):
+         # Make sure that if interrupt_main is called in main thread that
+         # KeyboardInterrupt is raised instantly.
+diff --git a/Tools/scripts/run_tests.py b/Tools/scripts/run_tests.py
+--- a/Tools/scripts/run_tests.py
++++ b/Tools/scripts/run_tests.py
+@@ -39,7 +39,7 @@ def main(regrtest_args):
+     if not any(is_multiprocess_flag(arg) for arg in regrtest_args):
+         args.extend(['-j', '0'])  # Use all CPU cores
+     if not any(is_resource_use_flag(arg) for arg in regrtest_args):
+-        args.extend(['-u', 'all,-largefile,-audio,-gui'])
++        args.extend(['-u', 'all,-largefile,-audio,-gui,-network'])
+     args.extend(regrtest_args)
+     print(' '.join(args))
+     if sys.platform == 'win32':
+diff --git a/Lib/test/_test_multiprocessing.py b/Lib/test/_test_multiprocessing.py
+index 1474624..887f8ee 100644
+--- a/Lib/test/_test_multiprocessing.py
++++ b/Lib/test/_test_multiprocessing.py
+@@ -3801,6 +3801,7 @@ class _TestSharedMemory(BaseTestCase):
+         sms.close()
+
+     @unittest.skipIf(os.name != "posix", "not feasible in non-posix platforms")
++    @unittest.skipUnless(sys.stdin.isatty(), "KeyboardInterrupts require a TTY device")
+     def test_shared_memory_SharedMemoryServer_ignores_sigint(self):
+         # bpo-36368: protect SharedMemoryManager server process from
+         # KeyboardInterrupt signals.
+diff --git a/Lib/test/test_signal.py b/Lib/test/test_signal.py
+index d41e94b..a1c15e7 100644
+--- a/Lib/test/test_signal.py
++++ b/Lib/test/test_signal.py
+@@ -78,6 +78,7 @@ class PosixTests(unittest.TestCase):
+         self.assertLess(len(s), signal.NSIG)
+
+     @unittest.skipUnless(sys.executable, "sys.executable required.")
++    @unittest.skipUnless(sys.stdin.isatty(), "KeyboardInterrupts require a TTY device")
+     def test_keyboard_interrupt_exit_code(self):
+         """KeyboardInterrupt triggers exit via SIGINT."""
+         process = subprocess.run(
+@@ -128,6 +129,7 @@ class WindowsSignalTests(unittest.TestCase):
+             signal.signal(7, handler)
+
+     @unittest.skipUnless(sys.executable, "sys.executable required.")
++    @unittest.skipUnless(sys.stdin.isatty(), "KeyboardInterrupts require a TTY device")
+     def test_keyboard_interrupt_exit_code(self):
+         """KeyboardInterrupt triggers an exit using STATUS_CONTROL_C_EXIT."""
+         # We don't test via os.kill(os.getpid(), signal.CTRL_C_EVENT) here
+@@ -1245,6 +1247,7 @@ class StressTest(unittest.TestCase):
+
+ class RaiseSignalTest(unittest.TestCase):
+
++    @unittest.skipUnless(sys.stdin.isatty(), "KeyboardInterrupts require a TTY device")
+     def test_sigint(self):
+         with self.assertRaises(KeyboardInterrupt):
+             signal.raise_signal(signal.SIGINT)
+@@ -1279,6 +1279,7 @@ class PidfdSignalTest(unittest.TestCase):
+         hasattr(signal, "pidfd_send_signal"),
+         "pidfd support not built in",
+     )
++    @unittest.skipUnless(sys.stdin.isatty(), "KeyboardInterrupts require a TTY device")
+     def test_pidfd_send_signal(self):
+         with self.assertRaises(OSError) as cm:
+             signal.pidfd_send_signal(0, signal.SIGINT)
+diff --git a/Lib/ctypes/test/test_find.py b/Lib/ctypes/test/test_find.py
+index 92ac184..49eec2c 100644
+--- a/Lib/ctypes/test/test_find.py
++++ b/Lib/ctypes/test/test_find.py
+@@ -116,6 +116,7 @@ class FindLibraryLinux(unittest.TestCase):
+         with unittest.mock.patch("ctypes.util._findSoname_ldconfig", lambda *args: None):
+             self.assertNotEqual(find_library('c'), None)
+
++    @unittest.skipIf(True, "This fails for unknown reasons on Guix")
+     def test_find_library_with_ld(self):
+         with unittest.mock.patch("ctypes.util._findSoname_ldconfig", lambda *args: None), \
+              unittest.mock.patch("ctypes.util._findLib_gcc", lambda *args: None):
diff --git a/gnu/packages/python.scm b/gnu/packages/python.scm
index 43704bccae..fa9bf10e07 100644
--- a/gnu/packages/python.scm
+++ b/gnu/packages/python.scm
@@ -520,6 +520,31 @@ data types.")
                                         (version-major+minor version)
                                         "/site-packages"))))))))
 
+(define-public python-3.9
+  (package (inherit python-3.8)
+    (name "python-next")
+    (version "3.9.1")
+    (source (origin
+              (method url-fetch)
+              (uri (string-append "https://www.python.org/ftp/python/"
+                                  version "/Python-" version ".tar.xz"))
+              (patches (search-patches
+                        "python-3.9-fix-tests.patch"
+                        "python-3-deterministic-build-info.patch"
+                        "python-3-search-paths.patch"))
+              (sha256
+               (base32
+                "1zq3k4ymify5ig739zyvx9s2ainvchxb1zpy139z74krr653y74r"))
+              (modules '((guix build utils)))
+              (snippet
+               '(begin
+                  ;; Delete the bundled copy of libexpat.
+                  (delete-file-recursively "Modules/expat")
+                  (substitute* "Modules/Setup"
+                    ;; Link Expat instead of embedding the bundled one.
+                    (("^#pyexpat.*") "pyexpat pyexpat.c -lexpat\n"))
+                  #t))))))
+
 ;; Current 3.x version.
 (define-public python-3 python-3.8)
 
