BuiltinTest.test_pow fails with Python-3.8

Hi all.

This the output of a failed test (future c423752879acc05eebc29b0bb9909327bd5c7308) with `Python-3.8.0b1`:

```
=================================== FAILURES ===================================
_____________________________ BuiltinTest.test_pow _____________________________

self = <test_future.test_builtins.BuiltinTest testMethod=test_pow>

    def test_pow(self):
        self.assertEqual(pow(0,0), 1)
        self.assertEqual(pow(0,1), 0)
        self.assertEqual(pow(1,0), 1)
        self.assertEqual(pow(1,1), 1)
    
        self.assertEqual(pow(2,0), 1)
        self.assertEqual(pow(2,10), 1024)
        self.assertEqual(pow(2,20), 1024*1024)
        self.assertEqual(pow(2,30), 1024*1024*1024)
    
        self.assertEqual(pow(-2,0), 1)
        self.assertEqual(pow(-2,1), -2)
        self.assertEqual(pow(-2,2), 4)
        self.assertEqual(pow(-2,3), -8)
    
        self.assertAlmostEqual(pow(0.,0), 1.)
        self.assertAlmostEqual(pow(0.,1), 0.)
        self.assertAlmostEqual(pow(1.,0), 1.)
        self.assertAlmostEqual(pow(1.,1), 1.)
    
        self.assertAlmostEqual(pow(2.,0), 1.)
        self.assertAlmostEqual(pow(2.,10), 1024.)
        self.assertAlmostEqual(pow(2.,20), 1024.*1024.)
        self.assertAlmostEqual(pow(2.,30), 1024.*1024.*1024.)
    
        self.assertAlmostEqual(pow(-2.,0), 1.)
        self.assertAlmostEqual(pow(-2.,1), -2.)
        self.assertAlmostEqual(pow(-2.,2), 4.)
        self.assertAlmostEqual(pow(-2.,3), -8.)
    
        for x in 2, int(2), 2.0:
            for y in 10, int(10), 10.0:
                for z in 1000, int(1000), 1000.0:
                    if isinstance(x, float) or \
                       isinstance(y, float) or \
                       isinstance(z, float):
                        self.assertRaises(TypeError, pow, x, y, z)
                    else:
                        self.assertAlmostEqual(pow(x, y, z), 24.0)
    
        self.assertAlmostEqual(pow(-1, 0.5), 1j)
        self.assertAlmostEqual(pow(-1, 1/3), 0.5 + 0.8660254037844386j)
    
        # Raises TypeError in Python < v3.5, ValueError in v3.5:
>       self.assertRaises((TypeError, ValueError), pow, -1, -2, 3)
E       AssertionError: (<class 'TypeError'>, <class 'ValueError'>) not raised by pow

tests/test_future/test_builtins.py:1289: AssertionError
=============================== warnings summary ===============================
tests/test_future/test_backports.py:13
tests/test_future/test_backports.py:13
  /builddir/build/BUILD/python-future-c423752879acc05eebc29b0bb9909327bd5c7308/python3/tests/test_future/test_backports.py:13: DeprecationWarning: Using or importing the ABCs from 'collections' instead of from 'collections.abc' is deprecated since Python 3.3,and in 3.9 it will stop working
    from collections import Mapping, MutableMapping

tests/test_future/test_builtins.py:267
  /builddir/build/BUILD/python-future-c423752879acc05eebc29b0bb9909327bd5c7308/python3/tests/test_future/test_builtins.py:267: SyntaxWarning: invalid escape sequence \u
    (str(b'\u0663\u0661\u0664 ','raw-unicode-escape'), 314),

tests/test_future/test_builtins.py:289
  /builddir/build/BUILD/python-future-c423752879acc05eebc29b0bb9909327bd5c7308/python3/tests/test_future/test_builtins.py:289: SyntaxWarning: invalid escape sequence \u
    (str(b'\u0663\u0661\u0664 ','raw-unicode-escape'), 314),

build/lib/future/backports/test/support.py:1977
  /builddir/build/BUILD/python-future-c423752879acc05eebc29b0bb9909327bd5c7308/python3/build/lib/future/backports/test/support.py:1977: SyntaxWarning: 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/python-future-c423752879acc05eebc29b0bb9909327bd5c7308/python3/build/lib/future/backports/email/utils.py:68: SyntaxWarning: invalid escape sequence \A
    '([^\ud800-\udbff]|\A)[\udc00-\udfff]([^\udc00-\udfff]|\Z)').search

build/lib/future/backports/urllib/parse.py:957
  /builddir/build/BUILD/python-future-c423752879acc05eebc29b0bb9909327bd5c7308/python3/build/lib/future/backports/urllib/parse.py:957: SyntaxWarning: invalid escape sequence \?
    _queryprog = re.compile('^(.*)\?([^?]*)$')

tests/test_future/test_htmlparser.py:685
  /builddir/build/BUILD/python-future-c423752879acc05eebc29b0bb9909327bd5c7308/python3/tests/test_future/test_htmlparser.py:685: SyntaxWarning: invalid escape sequence \=
    "<a $><b $=%><c \=/>",

build/lib/future/backports/html/parser.py:31
  /builddir/build/BUILD/python-future-c423752879acc05eebc29b0bb9909327bd5c7308/python3/build/lib/future/backports/html/parser.py:31: SyntaxWarning: 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/python-future-c423752879acc05eebc29b0bb9909327bd5c7308/python3/build/lib/future/backports/html/parser.py:79: SyntaxWarning: 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/python-future-c423752879acc05eebc29b0bb9909327bd5c7308/python3/tests/test_future/test_http_cookiejar.py:1034: SyntaxWarning: invalid escape sequence \$
    self.assertRegex(h, "\$Port([^=]|$)",

tests/test_future/test_http_cookiejar.py:1373
  /builddir/build/BUILD/python-future-c423752879acc05eebc29b0bb9909327bd5c7308/python3/tests/test_future/test_http_cookiejar.py:1373: SyntaxWarning: invalid escape sequence \s
    '\s*\$Path="\/acme"')

tests/test_future/test_http_cookiejar.py:1375
  /builddir/build/BUILD/python-future-c423752879acc05eebc29b0bb9909327bd5c7308/python3/tests/test_future/test_http_cookiejar.py:1375: SyntaxWarning: invalid escape sequence \s
    '\s*\$Path="\/acme"')

build/lib/future/backports/http/client.py:1
  /builddir/build/BUILD/python-future-c423752879acc05eebc29b0bb9909327bd5c7308/python3/build/lib/future/backports/http/client.py:1: SyntaxWarning: invalid escape sequence \_
    """HTTP/1.1 client library

build/lib/future/backports/email/feedparser.py:37
  /builddir/build/BUILD/python-future-c423752879acc05eebc29b0bb9909327bd5c7308/python3/build/lib/future/backports/email/feedparser.py:37: SyntaxWarning: invalid escape sequence \Z
    NLCRE_eol = re.compile('(\r\n|\r|\n)\Z')

build/lib/future/backports/http/cookiejar.py:212
  /builddir/build/BUILD/python-future-c423752879acc05eebc29b0bb9909327bd5c7308/python3/build/lib/future/backports/http/cookiejar.py:212: SyntaxWarning: 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/python-future-c423752879acc05eebc29b0bb9909327bd5c7308/python3/build/lib/future/backports/http/cookiejar.py:289: SyntaxWarning: invalid escape sequence \d
    """^

build/lib/future/backports/http/cookiejar.py:423
  /builddir/build/BUILD/python-future-c423752879acc05eebc29b0bb9909327bd5c7308/python3/build/lib/future/backports/http/cookiejar.py:423: SyntaxWarning: invalid escape sequence \s
    non_junk, nr_junk_chars = re.subn("^[=\s;]*", "", text)

tests/test_future/test_range.py:9
tests/test_future/test_range.py:9
  /builddir/build/BUILD/python-future-c423752879acc05eebc29b0bb9909327bd5c7308/python3/tests/test_future/test_range.py:9: DeprecationWarning: Using or importing the ABCs from 'collections' instead of from 'collections.abc' is deprecated since Python 3.3,and in 3.9 it will stop working
    from collections import Iterator, Sequence

tests/test_future/test_urllib.py:536
  /builddir/build/BUILD/python-future-c423752879acc05eebc29b0bb9909327bd5c7308/python3/tests/test_future/test_urllib.py:536: SyntaxWarning: invalid escape sequence \^
    """Tests for urllib.quote() and urllib.quote_plus()

tests/test_future/test_urllib.py:611
  /builddir/build/BUILD/python-future-c423752879acc05eebc29b0bb9909327bd5c7308/python3/tests/test_future/test_urllib.py:611: SyntaxWarning: invalid escape sequence \^
    should_quote.append('<>#%"{}|\^[]`')

tests/test_future/test_urllib_response.py:11
  /builddir/build/BUILD/python-future-c423752879acc05eebc29b0bb9909327bd5c7308/python3/tests/test_future/test_urllib_response.py:11: PytestWarning: cannot collect test class 'TestFile' because it has a __init__ constructor
    class TestFile(object):

tests/test_future/test_urllib_toplevel.py:551
  /builddir/build/BUILD/python-future-c423752879acc05eebc29b0bb9909327bd5c7308/python3/tests/test_future/test_urllib_toplevel.py:551: SyntaxWarning: invalid escape sequence \^
    """Tests for urllib.quote() and urllib.quote_plus()

tests/test_future/test_urllib_toplevel.py:626
  /builddir/build/BUILD/python-future-c423752879acc05eebc29b0bb9909327bd5c7308/python3/tests/test_future/test_urllib_toplevel.py:626: SyntaxWarning: invalid escape sequence \^
    should_quote.append('<>#%"{}|\^[]`')

build/lib/past/types/oldstr.py:18
  /builddir/build/BUILD/python-future-c423752879acc05eebc29b0bb9909327bd5c7308/python3/build/lib/past/types/oldstr.py:18: SyntaxWarning: invalid escape sequence \d
    """

build/lib/past/builtins/misc.py:79
tests/test_past/test_builtins.py::BuiltinTest::test_execfile
tests/test_past/test_builtins.py::BuiltinTest::test_execfile
tests/test_past/test_builtins.py::BuiltinTest::test_execfile
tests/test_past/test_builtins.py::BuiltinTest::test_execfile
tests/test_past/test_builtins.py::BuiltinTest::test_execfile
  /builddir/build/BUILD/python-future-c423752879acc05eebc29b0bb9909327bd5c7308/python3/build/lib/past/builtins/misc.py:79: DeprecationWarning: 'U' mode is deprecated
    with open(filename, "rbU") as fin:

tests/test_future/test_bytes.py::TestBytes::test_multiple_inheritance
  /builddir/build/BUILD/python-future-c423752879acc05eebc29b0bb9909327bd5c7308/python3/tests/test_future/test_bytes.py:709: DeprecationWarning: Using or importing the ABCs from 'collections' instead of from 'collections.abc' is deprecated since Python 3.3,and in 3.9 it will stop working
    class Foo(Base, collections.Container):

tests/test_future/test_int.py::IntTestCases::test_intconversion
  /builddir/build/BUILD/python-future-c423752879acc05eebc29b0bb9909327bd5c7308/python3/tests/test_future/test_int.py:360: DeprecationWarning: __int__ returned non-int (type Foo3).  The ability to return an instance of a strict subclass of int is deprecated, and may be removed in a future version of Python.
    self.assertEqual(int(Foo3()), 0)

tests/test_future/test_range.py::RangeTests::test_slice_zero_step
  /builddir/build/BUILD/python-future-c423752879acc05eebc29b0bb9909327bd5c7308/python3/tests/test_future/test_range.py:195: DeprecationWarning: Please use assertRaisesRegex instead.
    with self.assertRaisesRegexp(ValueError, msg):

tests/test_future/test_standard_library.py::TestStandardLibraryReorganization::test_reload
  /usr/lib64/python3.8/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_urllib2.py::HandlerTests::test_http
  /builddir/build/BUILD/python-future-c423752879acc05eebc29b0bb9909327bd5c7308/python3/build/lib/future/backports/urllib/request.py:1224: DeprecationWarning: Using or importing the ABCs from 'collections' instead of from 'collections.abc' is deprecated since Python 3.3,and in 3.9 it will stop working
    if isinstance(data, collections.Iterable):

tests/test_future/test_urllib_toplevel.py::Utility_Tests::test_splitpasswd
  /builddir/build/BUILD/python-future-c423752879acc05eebc29b0bb9909327bd5c7308/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/python-future-c423752879acc05eebc29b0bb9909327bd5c7308/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/python-future-c423752879acc05eebc29b0bb9909327bd5c7308/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/python-future-c423752879acc05eebc29b0bb9909327bd5c7308/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/python-future-c423752879acc05eebc29b0bb9909327bd5c7308/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/python-future-c423752879acc05eebc29b0bb9909327bd5c7308/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/python-future-c423752879acc05eebc29b0bb9909327bd5c7308/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/python-future-c423752879acc05eebc29b0bb9909327bd5c7308/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/python-future-c423752879acc05eebc29b0bb9909327bd5c7308/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/python-future-c423752879acc05eebc29b0bb9909327bd5c7308/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/python-future-c423752879acc05eebc29b0bb9909327bd5c7308/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_past/test_oldstr.py::TestOldStr::test_unescape
  /builddir/build/BUILD/python-future-c423752879acc05eebc29b0bb9909327bd5c7308/python3/build/lib/past/types/oldstr.py:32: DeprecationWarning: invalid escape sequence '\c'
    return s.encode().decode('unicode_escape')

-- Docs: https://docs.pytest.org/en/latest/warnings.html
= 1 failed, 1004 passed, 53 skipped, 47 xfailed, 50 warnings in 30.28 seconds ==
```

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BuiltinTest.test_pow fails with Python-3.8 #474

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BuiltinTest.test_pow fails with Python-3.8 #474

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