Drop support for Python 3.5 (#4675)

Python 3.5 EOL was on 2020-09-30.

tests/stubtest_test.py

@@ -3,7 +3,7 @@
 
 stubtest is a script in the mypy project that compares stubs to the actual objects at runtime.
 Note that therefore the output of stubtest depends on which Python version it is run with.
-In typeshed CI, we run stubtest with each Python minor version from 3.5 through 3.9 inclusive.
+In typeshed CI, we run stubtest with each currently supported Python minor version, except 2.7.
 
 We pin the version of mypy / stubtest we use in .travis.yml so changes to those don't break
 typeshed CI.

tests/stubtest_whitelists/linux-py35.txt

@@ -1,5 +0,0 @@
-asyncio.unix_events._UnixSelectorEventLoop.create_unix_server
-pwd.getpwnam
-socket.NETLINK_CRYPTO
-ssl.PROTOCOL_SSLv3
-ssl.RAND_egd

tests/stubtest_whitelists/py35.txt

@@ -1,81 +0,0 @@
-asyncio.Future._callbacks
-asyncio.Future._exception
-asyncio.Future._loop
-asyncio.Future._tb_logger
-asyncio.Task.__init__
-asyncio.Task._wakeup
-asyncio.base_futures  # Added in Python 3.6
-asyncio.base_tasks  # Added in Python 3.6
-asyncio.exceptions  # Added in Python 3.8
-asyncio.format_helpers  # Added in Python 3.7
-asyncio.futures.Future._callbacks
-asyncio.futures.Future._exception
-asyncio.futures.Future._loop
-asyncio.futures.Future._tb_logger
-asyncio.futures._TracebackLogger.__init__
-asyncio.runners
-asyncio.staggered  # Added in Python 3.8
-asyncio.tasks.Task.__init__
-asyncio.tasks.Task._wakeup
-asyncio.threads  # Added in Python 3.9
-asyncio.trsock  # Added in Python 3.8
-bdb.GENERATOR_AND_COROUTINE_FLAGS
-builtins.ModuleNotFoundError
-builtins.str.maketrans
-cmath.log
-codecs.StreamRecoder.seek
-collections.Reversible
-collections.UserString.maketrans
-contextlib._GeneratorContextManager.__init__
-ctypes.CDLL.__init__
-fractions.Fraction.__new__  # private _normalize param was made keyword-only in Python 3.6
-hmac.HMAC.__init__
-importlib.metadata
-importlib.resources
-io.StringIO.readline
-ipaddress._BaseNetwork.__init__
-json.dump
-json.dumps
-json.load
-json.loads
-mmap.ACCESS_DEFAULT
-multiprocessing.context.BaseContext.reducer
-multiprocessing.shared_memory
-nntplib._NNTPBase.starttls
-os.DirEntry
-os.utime
-plistlib.Dict.__init__
-pyexpat.XMLParserType.ExternalEntityParserCreate
-random.Random.randrange  # missing undocumented arg _int
-random.randrange  # missing undocumented arg _int
-smtpd.SMTPChannel.__init__
-smtpd.SMTPServer.__init__
-sre_compile.dis
-ssl.SSLSocket.__init__
-tarfile.TarFile.__init__  # undocumented arg copybufsize doesn't exist
-typing.Coroutine.cr_await
-typing.Coroutine.cr_code
-typing.Coroutine.cr_frame
-typing.Coroutine.cr_running
-typing.Generator.__new__
-typing.Generator.gi_code
-typing.Generator.gi_frame
-typing.Generator.gi_running
-typing.Generator.gi_yieldfrom
-typing.GenericMeta.__new__
-typing.IO.closed  # Incorrect definition in CPython, fixed in bpo-39493
-typing.Mapping.get
-typing.NamedTuple.__new__
-typing.NamedTuple._asdict
-typing.NamedTuple._make
-typing.NamedTuple._replace
-typing.Sequence.index
-typing.runtime_checkable
-unittest.async_case  # Added in Python 3.8
-uuid.UUID.int
-xml.etree.ElementTree.TreeBuilder.start  # Discrepancy between Python and C modules, fixed in bpo-39495
-xml.etree.cElementTree.TreeBuilder.start  # bpo-39495
-xml.etree.cElementTree.XMLPullParser
-xml.parsers.expat.XMLParserType.ExternalEntityParserCreate
-zipfile.ZipFile.open
-zlib.compress

tests/stubtest_whitelists/win32-py35.txt

@@ -1 +0,0 @@
-posixpath.splitunc  # This doesn't exist, but our hands are tied by check_consistent