remove more Python2 compatibility

misc/coding_tools/graph-deps.py

@@ -24,7 +24,7 @@
 import os, sys, subprocess, json, tempfile, zipfile, re, itertools
 import email.parser
 from pprint import pprint
-from six.moves import StringIO
+from io import StringIO
 import click
 
 all_packages = {} # name -> version

src/allmydata/_monkeypatch.py

@@ -4,13 +4,5 @@ Monkey-patching of third party libraries.
 Ported to Python 3.
 """
 
-from future.utils import PY2
-
-
-
 def patch():
     """Path third-party libraries to make Tahoe-LAFS work."""
-
-    if not PY2:
-        # Python 3 doesn't need to monkey patch Foolscap
-        return

src/allmydata/crypto/aes.py

@@ -10,8 +10,6 @@ objects that `cryptography` documents.
 Ported to Python 3.
 """
 
-import six
-
 from cryptography.hazmat.backends import default_backend
 from cryptography.hazmat.primitives.ciphers import (
     Cipher,
@@ -79,7 +77,7 @@ def encrypt_data(encryptor, plaintext):
     """
 
     _validate_cryptor(encryptor, encrypt=True)
-    if not isinstance(plaintext, six.binary_type):
+    if not isinstance(plaintext, bytes):
         raise ValueError('Plaintext must be bytes')
 
     return encryptor.update(plaintext)
@@ -118,7 +116,7 @@ def decrypt_data(decryptor, plaintext):
     """
 
     _validate_cryptor(decryptor, encrypt=False)
-    if not isinstance(plaintext, six.binary_type):
+    if not isinstance(plaintext, bytes):
         raise ValueError('Plaintext must be bytes')
 
     return decryptor.update(plaintext)
@@ -160,7 +158,7 @@ def _validate_key(key):
     """
     confirm `key` is suitable for AES encryption, or raise ValueError
     """
-    if not isinstance(key, six.binary_type):
+    if not isinstance(key, bytes):
         raise TypeError('Key must be bytes')
     if len(key) not in (16, 32):
         raise ValueError('Key must be 16 or 32 bytes long')
@@ -175,7 +173,7 @@ def _validate_iv(iv):
     """
     if iv is None:
         return DEFAULT_IV
-    if not isinstance(iv, six.binary_type):
+    if not isinstance(iv, bytes):
         raise TypeError('IV must be bytes')
     if len(iv) != 16:
         raise ValueError('IV must be 16 bytes long')

src/allmydata/frontends/sftpd.py

@@ -45,9 +45,6 @@ noisy = True
 from allmydata.util.log import NOISY, OPERATIONAL, WEIRD, \
     msg as logmsg, PrefixingLogMixin
 
-if six.PY3:
-    long = int
-
 
 def createSFTPError(errorCode, errorMessage):
     """

src/allmydata/node.py

@@ -112,8 +112,8 @@ def formatTimeTahoeStyle(self, when):
     """
     d = datetime.datetime.utcfromtimestamp(when)
     if d.microsecond:
-        return d.isoformat(ensure_str(" "))[:-3]+"Z"
+        return d.isoformat(" ")[:-3]+"Z"
-    return d.isoformat(ensure_str(" ")) + ".000Z"
+    return d.isoformat(" ") + ".000Z"
 
 PRIV_README = """
 This directory contains files which contain private data for the Tahoe node,

src/allmydata/scripts/default_nodedir.py

@@ -3,7 +3,6 @@ Ported to Python 3.
 """
 
 import sys
-import six
 from allmydata.util.assertutil import precondition
 from allmydata.util.fileutil import abspath_expanduser_unicode
 
@@ -13,10 +12,10 @@ if sys.platform == 'win32':
     from allmydata.windows import registry
     path = registry.get_base_dir_path()
     if path:
-        precondition(isinstance(path, six.text_type), path)
+        precondition(isinstance(path, str), path)
         _default_nodedir = abspath_expanduser_unicode(path)
 
 if _default_nodedir is None:
-    path = abspath_expanduser_unicode(u"~/.tahoe")
+    path = abspath_expanduser_unicode("~/.tahoe")
-    precondition(isinstance(path, six.text_type), path)
+    precondition(isinstance(path, str), path)
     _default_nodedir = path

src/allmydata/scripts/runner.py

@@ -65,8 +65,8 @@ class Options(usage.Options):
     ]
     optParameters = [
         ["node-directory", "d", None, NODEDIR_HELP],
-        ["wormhole-server", None, u"ws://wormhole.tahoe-lafs.org:4000/v1", "The magic wormhole server to use.", six.text_type],
+        ["wormhole-server", None, u"ws://wormhole.tahoe-lafs.org:4000/v1", "The magic wormhole server to use.", str],
-        ["wormhole-invite-appid", None, u"tahoe-lafs.org/invite", "The appid to use on the wormhole server.", six.text_type],
+        ["wormhole-invite-appid", None, u"tahoe-lafs.org/invite", "The appid to use on the wormhole server.", str],
     ]
 
     def opt_version(self):
@@ -262,7 +262,7 @@ def _setup_coverage(reactor, argv):
     # can we put this _setup_coverage call after we hit
     # argument-parsing?
     # ensure_str() only necessary on Python 2.
-    if six.ensure_str('--coverage') not in sys.argv:
+    if '--coverage' not in sys.argv:
         return
     argv.remove('--coverage')
 

src/allmydata/scripts/slow_operation.py

@@ -2,8 +2,6 @@
 Ported to Python 3.
 """
 
-from future.utils import PY3
-
 from six import ensure_str
 
 import os, time
@@ -81,8 +79,6 @@ class SlowOperationRunner(object):
         if not data["finished"]:
             return False
         if self.options.get("raw"):
-            if PY3:
-                # need to write bytes!
             stdout = stdout.buffer
             if is_printable_ascii(jdata):
                 stdout.write(jdata)

src/allmydata/scripts/tahoe_check.py

@@ -2,7 +2,7 @@
 Ported to Python 3.
 """
 
-from six import ensure_str, ensure_text
+from six import ensure_text
 
 from urllib.parse import quote as url_quote
 import json
@@ -168,7 +168,7 @@ class DeepCheckOutput(LineOnlyReceiver, object):
             # LIT files and directories do not have a "summary" field.
             summary = cr.get("summary", "Healthy (LIT)")
             # When Python 2 is dropped the ensure_text()/ensure_str() will be unnecessary.
-            print(ensure_text(ensure_str("%s: %s") % (quote_path(path), quote_output(summary, quotemarks=False)),
+            print(ensure_text("%s: %s" % (quote_path(path), quote_output(summary, quotemarks=False)),
                               encoding=get_io_encoding()), file=stdout)
 
         # always print out corrupt shares
@@ -246,13 +246,11 @@ class DeepCheckAndRepairOutput(LineOnlyReceiver, object):
             if not path:
                 path = ["<root>"]
             # we don't seem to have a summary available, so build one
-            # When Python 2 is dropped the ensure_text/ensure_str crap can be
-            # dropped.
             if was_healthy:
-                summary = ensure_str("healthy")
+                summary = "healthy"
             else:
-                summary = ensure_str("not healthy")
+                summary = "not healthy"
-            print(ensure_text(ensure_str("%s: %s") % (quote_path(path), summary),
+            print(ensure_text("%s: %s" % (quote_path(path), summary),
                               encoding=get_io_encoding()), file=stdout)
 
         # always print out corrupt shares

src/allmydata/scripts/tahoe_get.py

@@ -2,8 +2,6 @@
 Ported to Python 3.
 """
 
-from future.utils import PY3
-
 from urllib.parse import quote as url_quote
 from allmydata.scripts.common import get_alias, DEFAULT_ALIAS, escape_path, \
                                      UnknownAliasError
@@ -36,7 +34,7 @@ def get(options):
             outf = stdout
             # Make sure we can write bytes; on Python 3 stdout is Unicode by
             # default.
-            if PY3 and getattr(outf, "encoding", None) is not None:
+            if getattr(outf, "encoding", None) is not None:
                 outf = outf.buffer
         while True:
             data = resp.read(4096)

src/allmydata/scripts/tahoe_manifest.py

@@ -2,10 +2,6 @@
 Ported to Python 3.
 """
 
-from future.utils import PY3
-
-from six import ensure_str
-
 from urllib.parse import quote as url_quote
 import json
 from twisted.protocols.basic import LineOnlyReceiver
@@ -56,7 +52,6 @@ class ManifestStreamer(LineOnlyReceiver, object):
         # use Twisted to split this into lines
         self.in_error = False
         # Writing bytes, so need binary stdout.
-        if PY3:
         stdout = stdout.buffer
         while True:
             chunk = resp.read(100)
@@ -99,8 +94,7 @@ class ManifestStreamer(LineOnlyReceiver, object):
                     if vc:
                         print(quote_output(vc, quotemarks=False), file=stdout)
                 else:
-                    # ensure_str() only necessary for Python 2.
+                    print("%s %s" % (
-                    print(ensure_str("%s %s") % (
                         quote_output(d["cap"], quotemarks=False),
                         quote_path(d["path"], quotemarks=False)), file=stdout)
 

src/allmydata/storage/common.py

@@ -2,8 +2,6 @@
 Ported to Python 3.
 """
 
-from future.utils import PY3
-
 import os.path
 from allmydata.util import base32
 
@@ -43,7 +41,5 @@ def storage_index_to_dir(storageindex):
     Returns native string.
     """
     sia = si_b2a(storageindex)
-    if PY3:
-        # On Python 3 we expect paths to be unicode.
     sia = sia.decode("ascii")
     return os.path.join(sia[:2], sia)

src/allmydata/storage/crawler.py

@@ -4,9 +4,6 @@ Crawl the storage server shares.
 Ported to Python 3.
 """
 
-
-from future.utils import PY2, PY3
-
 import os
 import time
 import json
@@ -150,9 +147,6 @@ def _dump_json_to_file(js, afile):
     """
     with afile.open("wb") as f:
         data = json.dumps(js)
-        if PY2:
-            f.write(data)
-        else:
         f.write(data.encode("utf8"))
 
 
@@ -249,8 +243,6 @@ class ShareCrawler(service.MultiService):
         self._state_serializer = _LeaseStateSerializer(statefile)
         self.prefixes = [si_b2a(struct.pack(">H", i << (16-10)))[:2]
                          for i in range(2**10)]
-        if PY3:
-            # On Python 3 we expect the paths to be unicode, not bytes.
         self.prefixes = [p.decode("ascii") for p in self.prefixes]
         self.prefixes.sort()
         self.timer = None

src/allmydata/test/cli/test_backup.py

@@ -2,10 +2,8 @@
 Ported to Python 3.
 """
 
-from future.utils import PY2
-
 import os.path
-from six.moves import cStringIO as StringIO
+from io import StringIO
 from datetime import timedelta
 import re
 
@@ -421,9 +419,6 @@ class Backup(GridTestMixin, CLITestMixin, StallMixin, unittest.TestCase):
             else:
                 return original_open(name, *args, **kwargs)
 
-        if PY2:
-            from allmydata.scripts import cli as module_to_patch
-        else:
         import builtins as module_to_patch
         patcher = MonkeyPatcher((module_to_patch, 'open', call_file))
         patcher.runWithPatches(parse_options, basedir, "backup", ['--exclude-from-utf-8', unicode_to_argv(exclude_file), 'from', 'to'])

src/allmydata/test/cli/test_backupdb.py

@@ -4,7 +4,7 @@ Ported to Python 3.
 
 import sys
 import os.path, time
-from six.moves import cStringIO as StringIO
+from io import StringIO
 from twisted.trial import unittest
 
 from allmydata.util import fileutil

src/allmydata/test/cli/test_check.py

@@ -3,7 +3,7 @@ from six import ensure_text
 import os.path
 import json
 from twisted.trial import unittest
-from six.moves import cStringIO as StringIO
+from io import StringIO
 
 from allmydata import uri
 from allmydata.util import base32

src/allmydata/test/cli/test_cli.py

@@ -2,7 +2,7 @@
 Ported to Python 3.
 """
 
-from six.moves import cStringIO as StringIO
+from io import StringIO
 import re
 from six import ensure_text
 

src/allmydata/test/cli/test_create_alias.py

@@ -2,7 +2,7 @@
 Ported to Python 3.
 """
 
-from six.moves import StringIO
+from io import StringIO
 import os.path
 from twisted.trial import unittest
 from urllib.parse import quote as url_quote

src/allmydata/test/cli/test_list.py

@@ -2,9 +2,6 @@
 Ported to Python 3.
 """
 
-from future.utils import PY3
-from six import ensure_str
-
 from twisted.trial import unittest
 from twisted.internet import defer
 
@@ -26,10 +23,6 @@ class List(GridTestMixin, CLITestMixin, unittest.TestCase):
         good_arg = u"g\u00F6\u00F6d"
         good_out = u"g\u00F6\u00F6d"
 
-        # On Python 2 we get bytes, so we need encoded version. On Python 3
-        # stdio is unicode so can leave unchanged.
-        good_out_encoded = good_out if PY3 else good_out.encode(get_io_encoding())
-
         d = c0.create_dirnode()
         def _stash_root_and_create_file(n):
             self.rootnode = n
@@ -52,7 +45,7 @@ class List(GridTestMixin, CLITestMixin, unittest.TestCase):
             (rc, out, err) = args
             self.failUnlessReallyEqual(rc, 0)
             self.assertEqual(len(err), 0, err)
-            expected = sorted([ensure_str("0share"), ensure_str("1share"), good_out_encoded])
+            expected = sorted(["0share", "1share", good_out])
             self.assertEqual(sorted(out.splitlines()), expected)
         d.addCallback(_check1)
         d.addCallback(lambda ign: self.do_cli("ls", "missing"))
@@ -85,8 +78,8 @@ class List(GridTestMixin, CLITestMixin, unittest.TestCase):
                 # listing a file (as dir/filename) should have the edge metadata,
                 # including the filename
                 self.failUnlessReallyEqual(rc, 0)
-                self.failUnlessIn(good_out_encoded, out)
+                self.failUnlessIn(good_out, out)
-                self.failIfIn(ensure_str("-r-- %d -" % len(small)), out,
+                self.failIfIn("-r-- %d -" % len(small), out,
                               "trailing hyphen means unknown date")
 
         if good_arg is not None:

src/allmydata/test/cli/test_run.py

@@ -5,7 +5,7 @@ Tests for ``allmydata.scripts.tahoe_run``.
 from __future__ import annotations
 
 import re
-from six.moves import (
+from io import (
     StringIO,
 )
 

src/allmydata/test/common_util.py

@@ -2,7 +2,7 @@
 Ported to Python 3.
 """
 
-from future.utils import PY2, PY3, bchr, binary_type
+from future.utils import bchr
 from future.builtins import str as future_str
 
 import os
@@ -13,8 +13,6 @@ from functools import (
     partial,
 )
 from random import randrange
-if PY2:
-    from StringIO import StringIO
 from io import (
     TextIOWrapper,
     BytesIO,
@@ -101,22 +99,7 @@ def run_cli_native(verb, *args, **kwargs):
     )
     argv = ["tahoe"] + nodeargs + [verb] + list(args)
     stdin = kwargs.get("stdin", "")
-    if PY2:
+    if True:
-        # The original behavior, the Python 2 behavior, is to accept either
-        # bytes or unicode and try to automatically encode or decode as
-        # necessary.  This works okay for ASCII and if LANG is set
-        # appropriately.  These aren't great constraints so we should move
-        # away from this behavior.
-        #
-        # The encoding attribute doesn't change StringIO behavior on Python 2,
-        # but it's there for realism of the emulation.
-        stdin = StringIO(stdin)
-        stdin.encoding = encoding
-        stdout = StringIO()
-        stdout.encoding = encoding
-        stderr = StringIO()
-        stderr.encoding = encoding
-    else:
         # The new behavior, the Python 3 behavior, is to accept unicode and
         # encode it using a specific encoding. For older versions of Python 3,
         # the encoding is determined from LANG (bad) but for newer Python 3,
@@ -146,13 +129,13 @@ def run_cli_native(verb, *args, **kwargs):
         stderr=stderr,
     )
     def _done(rc, stdout=stdout, stderr=stderr):
-        if return_bytes and PY3:
+        if return_bytes:
             stdout = stdout.buffer
             stderr = stderr.buffer
         return 0, _getvalue(stdout), _getvalue(stderr)
     def _err(f, stdout=stdout, stderr=stderr):
         f.trap(SystemExit)
-        if return_bytes and PY3:
+        if return_bytes:
             stdout = stdout.buffer
             stderr = stderr.buffer
         return f.value.code, _getvalue(stdout), _getvalue(stderr)
@@ -189,10 +172,6 @@ def run_cli_unicode(verb, argv, nodeargs=None, stdin=None, encoding=None):
         argv=argv,
     )
     codec = encoding or "ascii"
-    if PY2:
-        encode = lambda t: None if t is None else t.encode(codec)
-    else:
-        # On Python 3 command-line parsing expects Unicode!
     encode = lambda t: t
     d = run_cli_native(
         encode(verb),
@@ -238,7 +217,7 @@ def flip_bit(good, which):
 def flip_one_bit(s, offset=0, size=None):
     """ flip one random bit of the string s, in a byte greater than or equal to offset and less
     than offset+size. """
-    precondition(isinstance(s, binary_type))
+    precondition(isinstance(s, bytes))
     if size is None:
         size=len(s)-offset
     i = randrange(offset, offset+size)

src/allmydata/test/mutable/test_filenode.py

@@ -2,7 +2,7 @@
 Ported to Python 3.
 """
 
-from six.moves import cStringIO as StringIO
+from io import StringIO
 from twisted.internet import defer, reactor
 from ..common import AsyncBrokenTestCase
 from testtools.matchers import (

src/allmydata/test/mutable/test_roundtrip.py

@@ -2,7 +2,7 @@
 Ported to Python 3.
 """
 
-from six.moves import cStringIO as StringIO
+from io import StringIO
 from ..common import AsyncTestCase
 from testtools.matchers import Equals, HasLength, Contains
 from twisted.internet import defer

src/allmydata/test/test_common_util.py

@@ -2,8 +2,6 @@
 This module has been ported to Python 3.
 """
 
-from future.utils import PY2
-
 import sys
 import random
 
@@ -31,7 +29,7 @@ class TestFlipOneBit(SyncTestCase):
 
     def test_accepts_byte_string(self):
         actual = flip_one_bit(b'foo')
-        self.assertEqual(actual, b'fno' if PY2 else b'fom')
+        self.assertEqual(actual, b'fom')
 
     def test_rejects_unicode_string(self):
         self.assertRaises(AssertionError, flip_one_bit, u'foo')

src/allmydata/test/test_crawler.py

@@ -5,8 +5,6 @@ Ported to Python 3.
 """
 
 
-from future.utils import PY3
-
 import time
 import os.path
 from twisted.trial import unittest
@@ -28,7 +26,6 @@ class BucketEnumeratingCrawler(ShareCrawler):
         self.all_buckets = []
         self.finished_d = defer.Deferred()
     def process_bucket(self, cycle, prefix, prefixdir, storage_index_b32):
-        if PY3:
         # Bucket _inputs_ are bytes, and that's what we will compare this
         # to:
         storage_index_b32 = storage_index_b32.encode("ascii")
@@ -46,7 +43,6 @@ class PacedCrawler(ShareCrawler):
         self.finished_d = defer.Deferred()
         self.yield_cb = None
     def process_bucket(self, cycle, prefix, prefixdir, storage_index_b32):
-        if PY3:
         # Bucket _inputs_ are bytes, and that's what we will compare this
         # to:
         storage_index_b32 = storage_index_b32.encode("ascii")

src/allmydata/test/test_crypto.py

@@ -1,6 +1,3 @@
-
-from future.utils import native_bytes
-
 import unittest
 
 from base64 import b64decode
@@ -40,7 +37,7 @@ class TestRegression(unittest.TestCase):
         #     priv_str = b64encode(priv.serialize())
         #     pub_str = b64encode(priv.get_verifying_key().serialize())
         RSA_2048_PRIV_KEY = b64decode(f.read().strip())
-        assert isinstance(RSA_2048_PRIV_KEY, native_bytes)
+        assert isinstance(RSA_2048_PRIV_KEY, bytes)
 
     with RESOURCE_DIR.child('pycryptopp-rsa-2048-sig.txt').open('r') as f:
         # Signature created using `RSA_2048_PRIV_KEY` via:
@@ -61,7 +58,7 @@ class TestRegression(unittest.TestCase):
         #     priv_str = b64encode(priv.serialize())
         #     pub_str = b64encode(priv.get_verifying_key().serialize())
         RSA_TINY_PRIV_KEY = b64decode(f.read().strip())
-        assert isinstance(RSA_TINY_PRIV_KEY, native_bytes)
+        assert isinstance(RSA_TINY_PRIV_KEY, bytes)
 
     with RESOURCE_DIR.child('pycryptopp-rsa-32768-priv.txt').open('r') as f:
         # Created using `pycryptopp`:
@@ -72,7 +69,7 @@ class TestRegression(unittest.TestCase):
         #     priv_str = b64encode(priv.serialize())
         #     pub_str = b64encode(priv.get_verifying_key().serialize())
         RSA_HUGE_PRIV_KEY = b64decode(f.read().strip())
-        assert isinstance(RSA_HUGE_PRIV_KEY, native_bytes)
+        assert isinstance(RSA_HUGE_PRIV_KEY, bytes)
 
     def test_old_start_up_test(self):
         """
@@ -324,7 +321,7 @@ class TestEd25519(unittest.TestCase):
         private_key, public_key = ed25519.create_signing_keypair()
         private_key_str = ed25519.string_from_signing_key(private_key)
 
-        self.assertIsInstance(private_key_str, native_bytes)
+        self.assertIsInstance(private_key_str, bytes)
 
         private_key2, public_key2 = ed25519.signing_keypair_from_string(private_key_str)
 
@@ -340,7 +337,7 @@ class TestEd25519(unittest.TestCase):
 
         # ditto, but for the verifying keys
         public_key_str = ed25519.string_from_verifying_key(public_key)
-        self.assertIsInstance(public_key_str, native_bytes)
+        self.assertIsInstance(public_key_str, bytes)
 
         public_key2 = ed25519.verifying_key_from_string(public_key_str)
         self.assertEqual(
@@ -444,7 +441,7 @@ class TestRsa(unittest.TestCase):
         priv_key, pub_key = rsa.create_signing_keypair(2048)
         priv_key_str = rsa.der_string_from_signing_key(priv_key)
 
-        self.assertIsInstance(priv_key_str, native_bytes)
+        self.assertIsInstance(priv_key_str, bytes)
 
         priv_key2, pub_key2 = rsa.create_signing_keypair_from_string(priv_key_str)
 

src/allmydata/test/test_download.py

@@ -10,7 +10,6 @@ from future.utils import bchr
 
 from typing import Any
 
-import six
 import os
 from twisted.trial import unittest
 from twisted.internet import defer, reactor
@@ -30,9 +29,6 @@ from allmydata.immutable.downloader.fetcher import SegmentFetcher
 from allmydata.codec import CRSDecoder
 from foolscap.eventual import eventually, fireEventually, flushEventualQueue
 
-if six.PY3:
-    long = int
-
 plaintext = b"This is a moderate-sized file.\n" * 10
 mutable_plaintext = b"This is a moderate-sized mutable file.\n" * 10
 

src/allmydata/test/test_encodingutil.py

@@ -1,8 +1,4 @@
 
-from future.utils import PY2, PY3
-
-from past.builtins import unicode
-
 lumiere_nfc = u"lumi\u00E8re"
 Artonwall_nfc = u"\u00C4rtonwall.mp3"
 Artonwall_nfd = u"A\u0308rtonwall.mp3"
@@ -46,12 +42,6 @@ if __name__ == "__main__":
         for fname in TEST_FILENAMES:
             open(os.path.join(tmpdir, fname), 'w').close()
 
-        # On Python 2, listing directories returns unicode under Windows or
-        # MacOS X if the input is unicode. On Python 3, it always returns
-        # Unicode.
-        if PY2 and sys.platform in ('win32', 'darwin'):
-            dirlist = os.listdir(unicode(tmpdir))
-        else:
         dirlist = os.listdir(tmpdir)
 
         print("    dirlist = %s" % repr(dirlist))
@@ -64,7 +54,6 @@ if __name__ == "__main__":
 
 
 import os, sys
-from unittest import skipIf
 
 from twisted.trial import unittest
 
@@ -87,15 +76,6 @@ class MockStdout(object):
 # The following tests apply only to platforms that don't store filenames as
 # Unicode entities on the filesystem.
 class EncodingUtilNonUnicodePlatform(unittest.TestCase):
-    @skipIf(PY3, "Python 3 is always Unicode, regardless of OS.")
-    def setUp(self):
-        # Make sure everything goes back to the way it was at the end of the
-        # test.
-        self.addCleanup(_reload)
-
-        # Mock sys.platform because unicode_platform() uses it.  Cleanups run
-        # in reverse order so we do this second so it gets undone first.
-        self.patch(sys, "platform", "linux")
 
     def test_listdir_unicode(self):
         # What happens if latin1-encoded filenames are encountered on an UTF-8
@@ -143,10 +123,7 @@ class EncodingUtil(ReallyEqualMixin):
         converts to bytes using UTF-8 elsewhere.
         """
         result = unicode_to_argv(lumiere_nfc)
-        if PY3 or self.platform == "win32":
         expected_value = lumiere_nfc
-        else:
-            expected_value = lumiere_nfc.encode(self.io_encoding)
 
         self.assertIsInstance(result, type(expected_value))
         self.assertEqual(result, expected_value)
@@ -167,9 +144,6 @@ class EncodingUtil(ReallyEqualMixin):
                                     % (self.filesystem_encoding,))
 
         def call_os_listdir(path):
-            if PY2:
-                return self.dirlist
-            else:
             # Python 3 always lists unicode filenames:
             return [d.decode(self.filesystem_encoding) if isinstance(d, bytes)
                     else d
@@ -204,9 +178,6 @@ class StdlibUnicode(unittest.TestCase):
         fn = lumiere_nfc + u'/' + lumiere_nfc + u'.txt'
         open(fn, 'wb').close()
         self.failUnless(os.path.exists(fn))
-        if PY2:
-            getcwdu = os.getcwdu
-        else:
         getcwdu = os.getcwd
         self.failUnless(os.path.exists(os.path.join(getcwdu(), fn)))
         filenames = listdir_unicode(lumiere_nfc)
@@ -237,7 +208,7 @@ class QuoteOutput(ReallyEqualMixin, unittest.TestCase):
         _reload()
 
     def _check(self, inp, out, enc, optional_quotes, quote_newlines):
-        if PY3 and isinstance(out, bytes):
+        if isinstance(out, bytes):
             out = out.decode(enc or encodingutil.io_encoding)
         out2 = out
         if optional_quotes:
@@ -266,8 +237,6 @@ class QuoteOutput(ReallyEqualMixin, unittest.TestCase):
 
     def _test_quote_output_all(self, enc):
         def check(inp, out, optional_quotes=False, quote_newlines=None):
-            if PY3:
-                # Result is always Unicode on Python 3
             out = out.decode("ascii")
             self._check(inp, out, enc, optional_quotes, quote_newlines)
 
@@ -354,8 +323,6 @@ def win32_other(win32, other):
 class QuotePaths(ReallyEqualMixin, unittest.TestCase):
 
     def assertPathsEqual(self, actual, expected):
-        if PY3:
-            # On Python 3, results should be unicode:
         expected = expected.decode("ascii")
         self.failUnlessReallyEqual(actual, expected)
 

src/allmydata/test/test_i2p_provider.py

@@ -6,8 +6,8 @@ import os
 from twisted.trial import unittest
 from twisted.internet import defer, error
 from twisted.python.usage import UsageError
-from six.moves import StringIO
+from io import StringIO
-import mock
+from unittest import mock
 from ..util import i2p_provider
 from ..scripts import create_node, runner
 

src/allmydata/test/test_runner.py

@@ -2,10 +2,6 @@
 Ported to Python 3
 """
 
-from future.utils import PY2
-
-from six import ensure_text
-
 import os.path, re, sys
 from os import linesep
 import locale
@@ -129,17 +125,13 @@ def run_bintahoe(extra_argv, python_options=None):
     :return: A three-tuple of stdout (unicode), stderr (unicode), and the
         child process "returncode" (int).
     """
-    executable = ensure_text(sys.executable)
+    argv = [sys.executable]
-    argv = [executable]
     if python_options is not None:
         argv.extend(python_options)
     argv.extend([u"-b", u"-m", u"allmydata.scripts.runner"])
     argv.extend(extra_argv)
     argv = list(unicode_to_argv(arg) for arg in argv)
     p = Popen(argv, stdout=PIPE, stderr=PIPE)
-    if PY2:
-        encoding = "utf-8"
-    else:
     encoding = locale.getpreferredencoding(False)
     out = p.stdout.read().decode(encoding)
     err = p.stderr.read().decode(encoding)
@@ -154,9 +146,6 @@ class BinTahoe(common_util.SignalMixin, unittest.TestCase):
         """
         tricky = u"\u00F6"
         out, err, returncode = run_bintahoe([tricky])
-        if PY2:
-            expected = u"Unknown command: \\xf6"
-        else:
         expected = u"Unknown command: \xf6"
         self.assertEqual(returncode, 1)
         self.assertIn(

src/allmydata/test/test_statistics.py

@@ -4,7 +4,7 @@ Tests for allmydata.util.statistics.
 Ported to Python 3.
 """
 
-from six.moves import StringIO  # native string StringIO
+from io import StringIO
 
 from twisted.trial import unittest
 

src/allmydata/test/test_storage_web.py

@@ -9,7 +9,7 @@ import os.path
 import re
 import json
 from unittest import skipIf
-from six.moves import StringIO
+from io import StringIO
 
 from twisted.trial import unittest
 from twisted.internet import defer

src/allmydata/test/test_tor_provider.py

@@ -5,9 +5,8 @@ Ported to Python 3.
 import os
 from twisted.trial import unittest
 from twisted.internet import defer, error
-from six.moves import StringIO
+from io import StringIO
-from six import ensure_str
+from unittest import mock
-import mock
 from ..util import tor_provider
 from ..scripts import create_node, runner
 from foolscap.eventual import flushEventualQueue
@@ -185,7 +184,7 @@ class CreateOnion(unittest.TestCase):
         txtorcon = mock.Mock()
         ehs = mock.Mock()
         # This appears to be a native string in the real txtorcon object...
-        ehs.private_key = ensure_str("privkey")
+        ehs.private_key = "privkey"
         ehs.hostname = "ONION.onion"
         txtorcon.EphemeralHiddenService = mock.Mock(return_value=ehs)
         ehs.add_to_tor = mock.Mock(return_value=defer.succeed(None))

src/allmydata/test/test_util.py

@@ -2,7 +2,6 @@
 Ported to Python3.
 """
 
-import six
 import os, time, sys
 import yaml
 import json
@@ -22,8 +21,7 @@ from allmydata.util.cputhreadpool import defer_to_thread, disable_thread_pool_fo
 from allmydata.test.common_util import ReallyEqualMixin
 from .no_network import fireNow, LocalWrapper
 
-if six.PY3:
+long = int
-    long = int
 
 
 class IDLib(unittest.TestCase):
@@ -477,7 +475,7 @@ class YAML(unittest.TestCase):
         Unicode and (ASCII) native strings get roundtripped to Unicode strings.
         """
         data = yaml.safe_dump(
-            [six.ensure_str("str"), u"unicode", u"\u1234nicode"]
+            ["str", "unicode", "\u1234nicode"]
         )
         back = yamlutil.safe_load(data)
         self.assertIsInstance(back[0], str)

src/allmydata/test/web/test_grid.py

@@ -5,7 +5,7 @@ Ported to Python 3.
 import os.path, re
 from urllib.parse import quote as url_quote
 import json
-from six.moves import StringIO
+from io import StringIO
 
 from bs4 import BeautifulSoup
 

src/allmydata/util/base62.py

@@ -4,15 +4,8 @@ Base62 encoding.
 Ported to Python 3.
 """
 
-from future.utils import PY2
+maketrans = bytes.maketrans
-
+translate = bytes.translate
-if PY2:
-    import string
-    maketrans = string.maketrans
-    translate = string.translate
-else:
-    maketrans = bytes.maketrans
-    translate = bytes.translate
 
 from past.builtins import chr as byteschr
 

src/allmydata/util/encodingutil.py

@@ -8,7 +8,7 @@ Once Python 2 support is dropped, most of this module will obsolete, since
 Unicode is the default everywhere in Python 3.
 """
 
-from future.utils import PY3, native_str
+from future.utils import native_str
 from future.builtins import str as future_str
 
 from past.builtins import unicode
@@ -56,25 +56,13 @@ def check_encoding(encoding):
 io_encoding = "utf-8"
 
 filesystem_encoding = None
-is_unicode_platform = False
+is_unicode_platform = True
-use_unicode_filepath = False
+use_unicode_filepath = True
 
 def _reload():
-    global filesystem_encoding, is_unicode_platform, use_unicode_filepath
+    global filesystem_encoding
-
     filesystem_encoding = canonical_encoding(sys.getfilesystemencoding())
     check_encoding(filesystem_encoding)
-    is_unicode_platform = PY3 or sys.platform in ["win32", "darwin"]
-
-    # Despite the Unicode-mode FilePath support added to Twisted in
-    # <https://twistedmatrix.com/trac/ticket/7805>, we can't yet use
-    # Unicode-mode FilePaths with INotify on non-Windows platforms due to
-    # <https://twistedmatrix.com/trac/ticket/7928>. Supposedly 7928 is fixed,
-    # though... and Tahoe-LAFS doesn't use inotify anymore!
-    #
-    # In the interest of not breaking anything, this logic is unchanged for
-    # Python 2, but on Python 3 the paths are always unicode, like it or not.
-    use_unicode_filepath = PY3 or sys.platform == "win32"
 
 _reload()
 
@@ -128,9 +116,7 @@ def unicode_to_argv(s):
     Windows, this returns the input unmodified.
     """
     precondition(isinstance(s, unicode), s)
-    if PY3:
+    warnings.warn("This is unnecessary.", DeprecationWarning)
-        warnings.warn("This will be unnecessary once Python 2 is dropped.",
-                      DeprecationWarning)
     if sys.platform == "win32":
         return s
     return ensure_str(s)
@@ -184,25 +170,9 @@ def unicode_to_output(s):
     the responsibility of stdout/stderr, they expect Unicode by default.
     """
     precondition(isinstance(s, unicode), s)
-    if PY3:
+    warnings.warn("This is unnecessary.", DeprecationWarning)
-        warnings.warn("This will be unnecessary once Python 2 is dropped.",
-                      DeprecationWarning)
     return s
 
-    try:
-        out = s.encode(io_encoding)
-    except (UnicodeEncodeError, UnicodeDecodeError):
-        raise UnicodeEncodeError(native_str(io_encoding), s, 0, 0,
-                                 native_str("A string could not be encoded as %s for output to the terminal:\n%r" %
-                                 (io_encoding, repr(s))))
-
-    if PRINTABLE_8BIT.search(out) is None:
-        raise UnicodeEncodeError(native_str(io_encoding), s, 0, 0,
-                                 native_str("A string encoded as %s for output to the terminal contained unsafe bytes:\n%r" %
-                                 (io_encoding, repr(s))))
-    return out
-
-
 def _unicode_escape(m, quote_newlines):
     u = m.group(0)
     if u == u'"' or u == u'$' or u == u'`' or u == u'\\':
@@ -303,19 +273,6 @@ def quote_output(s, quotemarks=True, quote_newlines=None, encoding=None):
         return b'"%s"' % (escaped.encode(encoding, 'backslashreplace'),)
 
     result = _encode(s)
-    if PY3:
-        # On Python 3 half of what this function does is unnecessary, since
-        # sys.stdout typically expects Unicode. To ensure no encode errors, one
-        # can do:
-        #
-        # sys.stdout.reconfigure(encoding=sys.stdout.encoding, errors="backslashreplace")
-        #
-        # Although the problem is that doesn't work in Python 3.6, only 3.7 or
-        # later... For now not thinking about it, just returning unicode since
-        # that is the right thing to do on Python 3.
-        #
-        # Now that Python 3.7 is the minimum, this can in theory be done:
-        # https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3866
     result = result.decode(encoding)
     return result
 

src/allmydata/util/hashutil.py

@@ -4,13 +4,6 @@ Hashing utilities.
 Ported to Python 3.
 """
 
-from future.utils import PY2
-if PY2:
-    # Don't import bytes to prevent leaking future's bytes.
-    from builtins import filter, map, zip, ascii, chr, hex, input, next, oct, open, pow, round, super, dict, list, object, range, str, max, min, bytes as future_bytes  # noqa: F401
-else:
-    future_bytes = bytes
-
 from past.builtins import chr as byteschr
 
 import os
@@ -246,7 +239,7 @@ def bucket_cancel_secret_hash(file_cancel_secret, peerid):
 
 
 def _xor(a, b):
-    return b"".join([byteschr(c ^ b) for c in future_bytes(a)])
+    return b"".join([byteschr(c ^ b) for c in bytes(a)])
 
 
 def hmac(tag, data):

src/allmydata/util/log.py

@@ -4,7 +4,6 @@ Logging utilities.
 Ported to Python 3.
 """
 
-from future.utils import PY2
 from six import ensure_str
 
 from pyutil import nummedobj
@@ -12,14 +11,10 @@ from pyutil import nummedobj
 from foolscap.logging import log
 from twisted.python import log as tw_log
 
-if PY2:
+# We want to convert bytes keys to Unicode, otherwise JSON serialization
-    def bytes_to_unicode(ign, obj):
+# inside foolscap will fail (for details see
-        return obj
+# https://github.com/warner/foolscap/issues/88)
-else:
+from .jsonbytes import bytes_to_unicode
-    # We want to convert bytes keys to Unicode, otherwise JSON serialization
-    # inside foolscap will fail (for details see
-    # https://github.com/warner/foolscap/issues/88)
-    from .jsonbytes import bytes_to_unicode
 
 
 NOISY = log.NOISY # 10

src/allmydata/windows/fixups.py

@@ -1,7 +1,3 @@
-
-from future.utils import PY3
-from past.builtins import unicode
-
 # This code isn't loadable or sensible except on Windows.  Importers all know
 # this and are careful.  Normally I would just let an import error from ctypes
 # explain any mistakes but Mypy also needs some help here.  This assert
@@ -123,82 +119,6 @@ def initialize():
 
     SetErrorMode(SEM_FAILCRITICALERRORS | SEM_NOOPENFILEERRORBOX)
 
-    if PY3:
-        # The rest of this appears to be Python 2-specific
-        return
-
-    original_stderr = sys.stderr
-
-    # If any exception occurs in this code, we'll probably try to print it on stderr,
-    # which makes for frustrating debugging if stderr is directed to our wrapper.
-    # So be paranoid about catching errors and reporting them to original_stderr,
-    # so that we can at least see them.
-    def _complain(output_file, message):
-        print(isinstance(message, str) and message or repr(message), file=output_file)
-        log.msg(message, level=log.WEIRD)
-
-    _complain = partial(_complain, original_stderr)
-
-    # Work around <http://bugs.python.org/issue6058>.
-    codecs.register(lambda name: name == 'cp65001' and codecs.lookup('utf-8') or None)
-
-    # Make Unicode console output work independently of the current code page.
-    # This also fixes <http://bugs.python.org/issue1602>.
-    # Credit to Michael Kaplan <https://blogs.msdn.com/b/michkap/archive/2010/04/07/9989346.aspx>
-    # and TZOmegaTZIOY
-    # <http://stackoverflow.com/questions/878972/windows-cmd-encoding-change-causes-python-crash/1432462#1432462>.
-    try:
-        old_stdout_fileno = None
-        old_stderr_fileno = None
-        if hasattr(sys.stdout, 'fileno'):
-            old_stdout_fileno = sys.stdout.fileno()
-        if hasattr(sys.stderr, 'fileno'):
-            old_stderr_fileno = sys.stderr.fileno()
-
-        real_stdout = (old_stdout_fileno == STDOUT_FILENO)
-        real_stderr = (old_stderr_fileno == STDERR_FILENO)
-
-        if real_stdout:
-            hStdout = GetStdHandle(STD_OUTPUT_HANDLE)
-            if not a_console(hStdout):
-                real_stdout = False
-
-        if real_stderr:
-            hStderr = GetStdHandle(STD_ERROR_HANDLE)
-            if not a_console(hStderr):
-                real_stderr = False
-
-        if real_stdout:
-            sys.stdout = UnicodeOutput(hStdout, None, STDOUT_FILENO, '<Unicode console stdout>', _complain)
-        else:
-            sys.stdout = UnicodeOutput(None, sys.stdout, old_stdout_fileno, '<Unicode redirected stdout>', _complain)
-
-        if real_stderr:
-            sys.stderr = UnicodeOutput(hStderr, None, STDERR_FILENO, '<Unicode console stderr>', _complain)
-        else:
-            sys.stderr = UnicodeOutput(None, sys.stderr, old_stderr_fileno, '<Unicode redirected stderr>', _complain)
-    except Exception as e:
-        _complain("exception %r while fixing up sys.stdout and sys.stderr" % (e,))
-
-    argv = list(arg.encode("utf-8") for arg in get_argv())
-
-    # Take only the suffix with the same number of arguments as sys.argv.
-    # This accounts for anything that can cause initial arguments to be stripped,
-    # for example, the Python interpreter or any options passed to it, or runner
-    # scripts such as 'coverage run'. It works even if there are no such arguments,
-    # as in the case of a frozen executable created by bb-freeze or similar.
-    #
-    # Also, modify sys.argv in place.  If any code has already taken a
-    # reference to the original argument list object then this ensures that
-    # code sees the new values.  This reliance on mutation of shared state is,
-    # of course, awful.  Why does this function even modify sys.argv?  Why not
-    # have a function that *returns* the properly initialized argv as a new
-    # list?  I don't know.
-    #
-    # At least Python 3 gets sys.argv correct so before very much longer we
-    # should be able to fix this bad design by deleting it.
-    sys.argv[:] = argv[-len(sys.argv):]
-
 
 def a_console(handle):
     """
@@ -274,13 +194,13 @@ class UnicodeOutput(object):
                 # There is no Windows console available.  That means we are
                 # responsible for encoding the unicode to a byte string to
                 # write it to a Python file object.
-                if isinstance(text, unicode):
+                if isinstance(text, str):
                     text = text.encode('utf-8')
                 self._stream.write(text)
             else:
                 # There is a Windows console available.  That means Windows is
                 # responsible for dealing with the unicode itself.
-                if not isinstance(text, unicode):
+                if not isinstance(text, str):
                     text = str(text).decode('utf-8')
                 remaining = len(text)
                 while remaining > 0: