syntax warnings under python3.9

[keszybz]

=============================== warnings summary ===============================
tests/test_future/test_builtins.py:267
  /builddir/build/BUILD/future-0.18.2/python3/tests/test_future/test_builtins.py:267: DeprecationWarning: invalid escape sequence \u
    (str(b'\u0663\u0661\u0664 ','raw-unicode-escape'), 314),

tests/test_future/test_builtins.py:289
  /builddir/build/BUILD/future-0.18.2/python3/tests/test_future/test_builtins.py:289: DeprecationWarning: invalid escape sequence \u
    (str(b'\u0663\u0661\u0664 ','raw-unicode-escape'), 314),

build/lib/future/backports/test/support.py:1977
  /builddir/build/BUILD/future-0.18.2/python3/build/lib/future/backports/test/support.py:1977: DeprecationWarning: invalid escape sequence \d
    m = re.match("2.6.(\d{1,2})", kernel_version)

build/lib/future/backports/email/utils.py:68
  /builddir/build/BUILD/future-0.18.2/python3/build/lib/future/backports/email/utils.py:68: DeprecationWarning: invalid escape sequence \A
    '([^\ud800-\udbff]|\A)[\udc00-\udfff]([^\udc00-\udfff]|\Z)').search

build/lib/future/backports/urllib/parse.py:957
  /builddir/build/BUILD/future-0.18.2/python3/build/lib/future/backports/urllib/parse.py:957: DeprecationWarning: invalid escape sequence \?
    _queryprog = re.compile('^(.*)\?([^?]*)$')

tests/test_future/test_htmlparser.py:685
  /builddir/build/BUILD/future-0.18.2/python3/tests/test_future/test_htmlparser.py:685: DeprecationWarning: invalid escape sequence \=
    "<a $><b $=%><c \=/>",

build/lib/future/backports/html/parser.py:31
  /builddir/build/BUILD/future-0.18.2/python3/build/lib/future/backports/html/parser.py:31: DeprecationWarning: invalid escape sequence \s
    tagfind = re.compile('([a-zA-Z][-.a-zA-Z0-9:_]*)(?:\s|/(?!>))*')

build/lib/future/backports/html/parser.py:79
  /builddir/build/BUILD/future-0.18.2/python3/build/lib/future/backports/html/parser.py:79: DeprecationWarning: invalid escape sequence \s
    endtagfind = re.compile('</\s*([a-zA-Z][-.a-zA-Z0-9:_]*)\s*>')

tests/test_future/test_http_cookiejar.py:1034
  /builddir/build/BUILD/future-0.18.2/python3/tests/test_future/test_http_cookiejar.py:1034: DeprecationWarning: invalid escape sequence \$
    self.assertRegex(h, "\$Port([^=]|$)",

tests/test_future/test_http_cookiejar.py:1373
  /builddir/build/BUILD/future-0.18.2/python3/tests/test_future/test_http_cookiejar.py:1373: DeprecationWarning: invalid escape sequence \s
    '\s*\$Path="\/acme"')

tests/test_future/test_http_cookiejar.py:1375
  /builddir/build/BUILD/future-0.18.2/python3/tests/test_future/test_http_cookiejar.py:1375: DeprecationWarning: invalid escape sequence \s
    '\s*\$Path="\/acme"')

build/lib/future/backports/http/client.py:1
  /builddir/build/BUILD/future-0.18.2/python3/build/lib/future/backports/http/client.py:1: DeprecationWarning: invalid escape sequence \_
    """HTTP/1.1 client library

build/lib/future/backports/email/feedparser.py:37
  /builddir/build/BUILD/future-0.18.2/python3/build/lib/future/backports/email/feedparser.py:37: DeprecationWarning: invalid escape sequence \Z
    NLCRE_eol = re.compile('(\r\n|\r|\n)\Z')

build/lib/future/backports/http/cookiejar.py:212
  /builddir/build/BUILD/future-0.18.2/python3/build/lib/future/backports/http/cookiejar.py:212: DeprecationWarning: invalid escape sequence \d
    "(\d\d\d\d) (\d\d):(\d\d):(\d\d) GMT$", re.ASCII)

build/lib/future/backports/http/cookiejar.py:289
  /builddir/build/BUILD/future-0.18.2/python3/build/lib/future/backports/http/cookiejar.py:289: DeprecationWarning: invalid escape sequence \d
    """^

build/lib/future/backports/http/cookiejar.py:423
  /builddir/build/BUILD/future-0.18.2/python3/build/lib/future/backports/http/cookiejar.py:423: DeprecationWarning: invalid escape sequence \s
    non_junk, nr_junk_chars = re.subn("^[=\s;]*", "", text)

tests/test_future/test_urllib.py:536
  /builddir/build/BUILD/future-0.18.2/python3/tests/test_future/test_urllib.py:536: DeprecationWarning: invalid escape sequence \^
    """Tests for urllib.quote() and urllib.quote_plus()

tests/test_future/test_urllib.py:611
  /builddir/build/BUILD/future-0.18.2/python3/tests/test_future/test_urllib.py:611: DeprecationWarning: invalid escape sequence \^
    should_quote.append('<>#%"{}|\^[]`')

tests/test_future/test_urllib_toplevel.py:551
  /builddir/build/BUILD/future-0.18.2/python3/tests/test_future/test_urllib_toplevel.py:551: DeprecationWarning: invalid escape sequence \^
    """Tests for urllib.quote() and urllib.quote_plus()

tests/test_future/test_urllib_toplevel.py:626
  /builddir/build/BUILD/future-0.18.2/python3/tests/test_future/test_urllib_toplevel.py:626: DeprecationWarning: invalid escape sequence \^
    should_quote.append('<>#%"{}|\^[]`')

build/lib/past/types/oldstr.py:23
  /builddir/build/BUILD/future-0.18.2/python3/build/lib/past/types/oldstr.py:23: DeprecationWarning: invalid escape sequence \d
    """

tests/test_future/test_standard_library.py::TestStandardLibraryReorganization::test_reload
  /usr/lib64/python3.9/importlib/__init__.py:169: DeprecationWarning: the imp module is deprecated in favour of importlib; see the module's documentation for alternative uses
    _bootstrap._exec(spec, module)

tests/test_future/test_urllib_toplevel.py::Utility_Tests::test_splitpasswd
  /builddir/build/BUILD/future-0.18.2/python3/tests/test_future/test_urllib_toplevel.py:1208: DeprecationWarning: urllib.parse.splitpasswd() is deprecated as of 3.8, use urllib.parse.urlparse() instead
    self.assertEqual(('user', 'ab'),urllib_parse.splitpasswd('user:ab'))

tests/test_future/test_urllib_toplevel.py::Utility_Tests::test_splitpasswd
  /builddir/build/BUILD/future-0.18.2/python3/tests/test_future/test_urllib_toplevel.py:1209: DeprecationWarning: urllib.parse.splitpasswd() is deprecated as of 3.8, use urllib.parse.urlparse() instead
    self.assertEqual(('user', 'a\nb'),urllib_parse.splitpasswd('user:a\nb'))

tests/test_future/test_urllib_toplevel.py::Utility_Tests::test_splitpasswd
  /builddir/build/BUILD/future-0.18.2/python3/tests/test_future/test_urllib_toplevel.py:1210: DeprecationWarning: urllib.parse.splitpasswd() is deprecated as of 3.8, use urllib.parse.urlparse() instead
    self.assertEqual(('user', 'a\tb'),urllib_parse.splitpasswd('user:a\tb'))

tests/test_future/test_urllib_toplevel.py::Utility_Tests::test_splitpasswd
  /builddir/build/BUILD/future-0.18.2/python3/tests/test_future/test_urllib_toplevel.py:1211: DeprecationWarning: urllib.parse.splitpasswd() is deprecated as of 3.8, use urllib.parse.urlparse() instead
    self.assertEqual(('user', 'a\rb'),urllib_parse.splitpasswd('user:a\rb'))

tests/test_future/test_urllib_toplevel.py::Utility_Tests::test_splitpasswd
  /builddir/build/BUILD/future-0.18.2/python3/tests/test_future/test_urllib_toplevel.py:1212: DeprecationWarning: urllib.parse.splitpasswd() is deprecated as of 3.8, use urllib.parse.urlparse() instead
    self.assertEqual(('user', 'a\fb'),urllib_parse.splitpasswd('user:a\fb'))

tests/test_future/test_urllib_toplevel.py::Utility_Tests::test_splitpasswd
  /builddir/build/BUILD/future-0.18.2/python3/tests/test_future/test_urllib_toplevel.py:1213: DeprecationWarning: urllib.parse.splitpasswd() is deprecated as of 3.8, use urllib.parse.urlparse() instead
    self.assertEqual(('user', 'a\vb'),urllib_parse.splitpasswd('user:a\vb'))

tests/test_future/test_urllib_toplevel.py::Utility_Tests::test_splitpasswd
  /builddir/build/BUILD/future-0.18.2/python3/tests/test_future/test_urllib_toplevel.py:1214: DeprecationWarning: urllib.parse.splitpasswd() is deprecated as of 3.8, use urllib.parse.urlparse() instead
    self.assertEqual(('user', 'a:b'),urllib_parse.splitpasswd('user:a:b'))

tests/test_future/test_urllib_toplevel.py::Utility_Tests::test_splitpasswd
  /builddir/build/BUILD/future-0.18.2/python3/tests/test_future/test_urllib_toplevel.py:1215: DeprecationWarning: urllib.parse.splitpasswd() is deprecated as of 3.8, use urllib.parse.urlparse() instead
    self.assertEqual(('user', 'a b'),urllib_parse.splitpasswd('user:a b'))

tests/test_future/test_urllib_toplevel.py::Utility_Tests::test_splitpasswd
  /builddir/build/BUILD/future-0.18.2/python3/tests/test_future/test_urllib_toplevel.py:1216: DeprecationWarning: urllib.parse.splitpasswd() is deprecated as of 3.8, use urllib.parse.urlparse() instead
    self.assertEqual(('user 2', 'ab'),urllib_parse.splitpasswd('user 2:ab'))

tests/test_future/test_urllib_toplevel.py::Utility_Tests::test_splitpasswd
  /builddir/build/BUILD/future-0.18.2/python3/tests/test_future/test_urllib_toplevel.py:1217: DeprecationWarning: urllib.parse.splitpasswd() is deprecated as of 3.8, use urllib.parse.urlparse() instead
    self.assertEqual(('user+1', 'a+b'),urllib_parse.splitpasswd('user+1:a+b'))

tests/test_future/test_urllibnet.py::urlopenNetworkTests::test_getcode
tests/test_future/test_urllibnet.py::test_main
  /builddir/build/BUILD/future-0.18.2/python3/tests/test_future/test_urllibnet.py:103: DeprecationWarning: FancyURLopener style of invoking requests is deprecated. Use newer urlopen functions/methods
    open_url = urllib_request.FancyURLopener().open(URL)

tests/test_future/test_utils.py::TestUtils::test_raise_
  /builddir/build/BUILD/future-0.18.2/python3/tests/test_future/test_utils.py:153: DeprecationWarning: Please use assertRaisesRegex instead.
    self.assertRaisesRegexp(

tests/test_past/test_oldstr.py::TestOldStr::test_unescape
  /builddir/build/BUILD/future-0.18.2/python3/build/lib/past/types/oldstr.py:37: DeprecationWarning: invalid escape sequence '\c'
    return s.encode().decode('unicode_escape')

-- Docs: https://docs.pytest.org/en/latest/warnings.html