updated from upstream | 17/05/2022 at 10:10

15 files changed, 178 insertions, 636 deletions

diff --git a/devscripts/bash-completion.py b/devscripts/bash-completion.py
index 46b4b2ff5..268e8a2ae 100755
--- a/devscripts/bash-completion.py
+++ b/devscripts/bash-completion.py
@@ -1,11 +1,9 @@
 #!/usr/bin/env python3
-from __future__ import unicode_literals
-
 import os
-from os.path import dirname as dirn
 import sys
 
-sys.path.insert(0, dirn(dirn((os.path.abspath(__file__)))))
+sys.path.insert(0, os.path.dirname(os.path.dirname(os.path.abspath(__file__))))
+
 import yt_dlp
 
 BASH_COMPLETION_FILE = "completions/bash/yt-dlp"
@@ -26,5 +24,5 @@ def build_completion(opt_parser):
         f.write(filled_template)
 
 
-parser = yt_dlp.parseOpts()[0]
+parser = yt_dlp.parseOpts(ignore_config_files=True)[0]
 build_completion(parser)
diff --git a/devscripts/buildserver.py b/devscripts/buildserver.py
deleted file mode 100644
index cd544b816..000000000
--- a/devscripts/buildserver.py
+++ /dev/null
@@ -1,435 +0,0 @@
-# UNUSED
-
-#!/usr/bin/python3
-
-import argparse
-import ctypes
-import functools
-import shutil
-import subprocess
-import sys
-import tempfile
-import threading
-import traceback
-import os.path
-
-sys.path.insert(0, os.path.dirname(os.path.dirname((os.path.abspath(__file__)))))
-from yt_dlp.compat import (
-    compat_input,
-    compat_http_server,
-    compat_str,
-    compat_urlparse,
-)
-
-# These are not used outside of buildserver.py thus not in compat.py
-
-try:
-    import winreg as compat_winreg
-except ImportError:  # Python 2
-    import _winreg as compat_winreg
-
-try:
-    import socketserver as compat_socketserver
-except ImportError:  # Python 2
-    import SocketServer as compat_socketserver
-
-
-class BuildHTTPServer(compat_socketserver.ThreadingMixIn, compat_http_server.HTTPServer):
-    allow_reuse_address = True
-
-
-advapi32 = ctypes.windll.advapi32
-
-SC_MANAGER_ALL_ACCESS = 0xf003f
-SC_MANAGER_CREATE_SERVICE = 0x02
-SERVICE_WIN32_OWN_PROCESS = 0x10
-SERVICE_AUTO_START = 0x2
-SERVICE_ERROR_NORMAL = 0x1
-DELETE = 0x00010000
-SERVICE_STATUS_START_PENDING = 0x00000002
-SERVICE_STATUS_RUNNING = 0x00000004
-SERVICE_ACCEPT_STOP = 0x1
-
-SVCNAME = 'youtubedl_builder'
-
-LPTSTR = ctypes.c_wchar_p
-START_CALLBACK = ctypes.WINFUNCTYPE(None, ctypes.c_int, ctypes.POINTER(LPTSTR))
-
-
-class SERVICE_TABLE_ENTRY(ctypes.Structure):
-    _fields_ = [
-        ('lpServiceName', LPTSTR),
-        ('lpServiceProc', START_CALLBACK)
-    ]
-
-
-HandlerEx = ctypes.WINFUNCTYPE(
-    ctypes.c_int,     # return
-    ctypes.c_int,     # dwControl
-    ctypes.c_int,     # dwEventType
-    ctypes.c_void_p,  # lpEventData,
-    ctypes.c_void_p,  # lpContext,
-)
-
-
-def _ctypes_array(c_type, py_array):
-    ar = (c_type * len(py_array))()
-    ar[:] = py_array
-    return ar
-
-
-def win_OpenSCManager():
-    res = advapi32.OpenSCManagerW(None, None, SC_MANAGER_ALL_ACCESS)
-    if not res:
-        raise Exception('Opening service manager failed - '
-                        'are you running this as administrator?')
-    return res
-
-
-def win_install_service(service_name, cmdline):
-    manager = win_OpenSCManager()
-    try:
-        h = advapi32.CreateServiceW(
-            manager, service_name, None,
-            SC_MANAGER_CREATE_SERVICE, SERVICE_WIN32_OWN_PROCESS,
-            SERVICE_AUTO_START, SERVICE_ERROR_NORMAL,
-            cmdline, None, None, None, None, None)
-        if not h:
-            raise OSError('Service creation failed: %s' % ctypes.FormatError())
-
-        advapi32.CloseServiceHandle(h)
-    finally:
-        advapi32.CloseServiceHandle(manager)
-
-
-def win_uninstall_service(service_name):
-    manager = win_OpenSCManager()
-    try:
-        h = advapi32.OpenServiceW(manager, service_name, DELETE)
-        if not h:
-            raise OSError('Could not find service %s: %s' % (
-                service_name, ctypes.FormatError()))
-
-        try:
-            if not advapi32.DeleteService(h):
-                raise OSError('Deletion failed: %s' % ctypes.FormatError())
-        finally:
-            advapi32.CloseServiceHandle(h)
-    finally:
-        advapi32.CloseServiceHandle(manager)
-
-
-def win_service_report_event(service_name, msg, is_error=True):
-    with open('C:/sshkeys/log', 'a', encoding='utf-8') as f:
-        f.write(msg + '\n')
-
-    event_log = advapi32.RegisterEventSourceW(None, service_name)
-    if not event_log:
-        raise OSError('Could not report event: %s' % ctypes.FormatError())
-
-    try:
-        type_id = 0x0001 if is_error else 0x0004
-        event_id = 0xc0000000 if is_error else 0x40000000
-        lines = _ctypes_array(LPTSTR, [msg])
-
-        if not advapi32.ReportEventW(
-                event_log, type_id, 0, event_id, None, len(lines), 0,
-                lines, None):
-            raise OSError('Event reporting failed: %s' % ctypes.FormatError())
-    finally:
-        advapi32.DeregisterEventSource(event_log)
-
-
-def win_service_handler(stop_event, *args):
-    try:
-        raise ValueError('Handler called with args ' + repr(args))
-        TODO
-    except Exception as e:
-        tb = traceback.format_exc()
-        msg = str(e) + '\n' + tb
-        win_service_report_event(service_name, msg, is_error=True)
-        raise
-
-
-def win_service_set_status(handle, status_code):
-    svcStatus = SERVICE_STATUS()
-    svcStatus.dwServiceType = SERVICE_WIN32_OWN_PROCESS
-    svcStatus.dwCurrentState = status_code
-    svcStatus.dwControlsAccepted = SERVICE_ACCEPT_STOP
-
-    svcStatus.dwServiceSpecificExitCode = 0
-
-    if not advapi32.SetServiceStatus(handle, ctypes.byref(svcStatus)):
-        raise OSError('SetServiceStatus failed: %r' % ctypes.FormatError())
-
-
-def win_service_main(service_name, real_main, argc, argv_raw):
-    try:
-        # args = [argv_raw[i].value for i in range(argc)]
-        stop_event = threading.Event()
-        handler = HandlerEx(functools.partial(stop_event, win_service_handler))
-        h = advapi32.RegisterServiceCtrlHandlerExW(service_name, handler, None)
-        if not h:
-            raise OSError('Handler registration failed: %s' %
-                          ctypes.FormatError())
-
-        TODO
-    except Exception as e:
-        tb = traceback.format_exc()
-        msg = str(e) + '\n' + tb
-        win_service_report_event(service_name, msg, is_error=True)
-        raise
-
-
-def win_service_start(service_name, real_main):
-    try:
-        cb = START_CALLBACK(
-            functools.partial(win_service_main, service_name, real_main))
-        dispatch_table = _ctypes_array(SERVICE_TABLE_ENTRY, [
-            SERVICE_TABLE_ENTRY(
-                service_name,
-                cb
-            ),
-            SERVICE_TABLE_ENTRY(None, ctypes.cast(None, START_CALLBACK))
-        ])
-
-        if not advapi32.StartServiceCtrlDispatcherW(dispatch_table):
-            raise OSError('ctypes start failed: %s' % ctypes.FormatError())
-    except Exception as e:
-        tb = traceback.format_exc()
-        msg = str(e) + '\n' + tb
-        win_service_report_event(service_name, msg, is_error=True)
-        raise
-
-
-def main(args=None):
-    parser = argparse.ArgumentParser()
-    parser.add_argument('-i', '--install',
-                        action='store_const', dest='action', const='install',
-                        help='Launch at Windows startup')
-    parser.add_argument('-u', '--uninstall',
-                        action='store_const', dest='action', const='uninstall',
-                        help='Remove Windows service')
-    parser.add_argument('-s', '--service',
-                        action='store_const', dest='action', const='service',
-                        help='Run as a Windows service')
-    parser.add_argument('-b', '--bind', metavar='<host:port>',
-                        action='store', default='0.0.0.0:8142',
-                        help='Bind to host:port (default %default)')
-    options = parser.parse_args(args=args)
-
-    if options.action == 'install':
-        fn = os.path.abspath(__file__).replace('v:', '\\\\vboxsrv\\vbox')
-        cmdline = '%s %s -s -b %s' % (sys.executable, fn, options.bind)
-        win_install_service(SVCNAME, cmdline)
-        return
-
-    if options.action == 'uninstall':
-        win_uninstall_service(SVCNAME)
-        return
-
-    if options.action == 'service':
-        win_service_start(SVCNAME, main)
-        return
-
-    host, port_str = options.bind.split(':')
-    port = int(port_str)
-
-    print('Listening on %s:%d' % (host, port))
-    srv = BuildHTTPServer((host, port), BuildHTTPRequestHandler)
-    thr = threading.Thread(target=srv.serve_forever)
-    thr.start()
-    compat_input('Press ENTER to shut down')
-    srv.shutdown()
-    thr.join()
-
-
-def rmtree(path):
-    for name in os.listdir(path):
-        fname = os.path.join(path, name)
-        if os.path.isdir(fname):
-            rmtree(fname)
-        else:
-            os.chmod(fname, 0o666)
-            os.remove(fname)
-    os.rmdir(path)
-
-
-class BuildError(Exception):
-    def __init__(self, output, code=500):
-        self.output = output
-        self.code = code
-
-    def __str__(self):
-        return self.output
-
-
-class HTTPError(BuildError):
-    pass
-
-
-class PythonBuilder(object):
-    def __init__(self, **kwargs):
-        python_version = kwargs.pop('python', '3.4')
-        python_path = None
-        for node in ('Wow6432Node\\', ''):
-            try:
-                key = compat_winreg.OpenKey(
-                    compat_winreg.HKEY_LOCAL_MACHINE,
-                    r'SOFTWARE\%sPython\PythonCore\%s\InstallPath' % (node, python_version))
-                try:
-                    python_path, _ = compat_winreg.QueryValueEx(key, '')
-                finally:
-                    compat_winreg.CloseKey(key)
-                break
-            except Exception:
-                pass
-
-        if not python_path:
-            raise BuildError('No such Python version: %s' % python_version)
-
-        self.pythonPath = python_path
-
-        super(PythonBuilder, self).__init__(**kwargs)
-
-
-class GITInfoBuilder(object):
-    def __init__(self, **kwargs):
-        try:
-            self.user, self.repoName = kwargs['path'][:2]
-            self.rev = kwargs.pop('rev')
-        except ValueError:
-            raise BuildError('Invalid path')
-        except KeyError as e:
-            raise BuildError('Missing mandatory parameter "%s"' % e.args[0])
-
-        path = os.path.join(os.environ['APPDATA'], 'Build archive', self.repoName, self.user)
-        if not os.path.exists(path):
-            os.makedirs(path)
-        self.basePath = tempfile.mkdtemp(dir=path)
-        self.buildPath = os.path.join(self.basePath, 'build')
-
-        super(GITInfoBuilder, self).__init__(**kwargs)
-
-
-class GITBuilder(GITInfoBuilder):
-    def build(self):
-        try:
-            subprocess.check_output(['git', 'clone', 'git://github.com/%s/%s.git' % (self.user, self.repoName), self.buildPath])
-            subprocess.check_output(['git', 'checkout', self.rev], cwd=self.buildPath)
-        except subprocess.CalledProcessError as e:
-            raise BuildError(e.output)
-
-        super(GITBuilder, self).build()
-
-
-class YoutubeDLBuilder(object):
-    authorizedUsers = ['fraca7', 'phihag', 'rg3', 'FiloSottile', 'ytdl-org']
-
-    def __init__(self, **kwargs):
-        if self.repoName != 'yt-dlp':
-            raise BuildError('Invalid repository "%s"' % self.repoName)
-        if self.user not in self.authorizedUsers:
-            raise HTTPError('Unauthorized user "%s"' % self.user, 401)
-
-        super(YoutubeDLBuilder, self).__init__(**kwargs)
-
-    def build(self):
-        try:
-            proc = subprocess.Popen([os.path.join(self.pythonPath, 'python.exe'), 'setup.py', 'py2exe'], stdin=subprocess.PIPE, cwd=self.buildPath)
-            proc.wait()
-            #subprocess.check_output([os.path.join(self.pythonPath, 'python.exe'), 'setup.py', 'py2exe'],
-            #                        cwd=self.buildPath)
-        except subprocess.CalledProcessError as e:
-            raise BuildError(e.output)
-
-        super(YoutubeDLBuilder, self).build()
-
-
-class DownloadBuilder(object):
-    def __init__(self, **kwargs):
-        self.handler = kwargs.pop('handler')
-        self.srcPath = os.path.join(self.buildPath, *tuple(kwargs['path'][2:]))
-        self.srcPath = os.path.abspath(os.path.normpath(self.srcPath))
-        if not self.srcPath.startswith(self.buildPath):
-            raise HTTPError(self.srcPath, 401)
-
-        super(DownloadBuilder, self).__init__(**kwargs)
-
-    def build(self):
-        if not os.path.exists(self.srcPath):
-            raise HTTPError('No such file', 404)
-        if os.path.isdir(self.srcPath):
-            raise HTTPError('Is a directory: %s' % self.srcPath, 401)
-
-        self.handler.send_response(200)
-        self.handler.send_header('Content-Type', 'application/octet-stream')
-        self.handler.send_header('Content-Disposition', 'attachment; filename=%s' % os.path.split(self.srcPath)[-1])
-        self.handler.send_header('Content-Length', str(os.stat(self.srcPath).st_size))
-        self.handler.end_headers()
-
-        with open(self.srcPath, 'rb') as src:
-            shutil.copyfileobj(src, self.handler.wfile)
-
-        super(DownloadBuilder, self).build()
-
-
-class CleanupTempDir(object):
-    def build(self):
-        try:
-            rmtree(self.basePath)
-        except Exception as e:
-            print('WARNING deleting "%s": %s' % (self.basePath, e))
-
-        super(CleanupTempDir, self).build()
-
-
-class Null(object):
-    def __init__(self, **kwargs):
-        pass
-
-    def start(self):
-        pass
-
-    def close(self):
-        pass
-
-    def build(self):
-        pass
-
-
-class Builder(PythonBuilder, GITBuilder, YoutubeDLBuilder, DownloadBuilder, CleanupTempDir, Null):
-    pass
-
-
-class BuildHTTPRequestHandler(compat_http_server.BaseHTTPRequestHandler):
-    actionDict = {'build': Builder, 'download': Builder}  # They're the same, no more caching.
-
-    def do_GET(self):
-        path = compat_urlparse.urlparse(self.path)
-        paramDict = dict([(key, value[0]) for key, value in compat_urlparse.parse_qs(path.query).items()])
-        action, _, path = path.path.strip('/').partition('/')
-        if path:
-            path = path.split('/')
-            if action in self.actionDict:
-                try:
-                    builder = self.actionDict[action](path=path, handler=self, **paramDict)
-                    builder.start()
-                    try:
-                        builder.build()
-                    finally:
-                        builder.close()
-                except BuildError as e:
-                    self.send_response(e.code)
-                    msg = compat_str(e).encode('UTF-8')
-                    self.send_header('Content-Type', 'text/plain; charset=UTF-8')
-                    self.send_header('Content-Length', len(msg))
-                    self.end_headers()
-                    self.wfile.write(msg)
-            else:
-                self.send_response(500, 'Unknown build method "%s"' % action)
-        else:
-            self.send_response(500, 'Malformed URL')
-
-if __name__ == '__main__':
-    main()
diff --git a/devscripts/check-porn.py b/devscripts/check-porn.py
index 50f6bebc6..08f663e4b 100644
--- a/devscripts/check-porn.py
+++ b/devscripts/check-porn.py
@@ -1,6 +1,4 @@
 #!/usr/bin/env python3
-from __future__ import unicode_literals
-
 """
 This script employs a VERY basic heuristic ('porn' in webpage.lower()) to check
 if we are not 'age_limit' tagging some porn site
@@ -12,11 +10,12 @@ pass the list filename as the only argument
 # Allow direct execution
 import os
 import sys
+
 sys.path.insert(0, os.path.dirname(os.path.dirname(os.path.abspath(__file__))))
 
 from test.helper import gettestcases
-from yt_dlp.utils import compat_urllib_parse_urlparse
-from yt_dlp.utils import compat_urllib_request
+
+from yt_dlp.utils import compat_urllib_parse_urlparse, compat_urllib_request
 
 if len(sys.argv) > 1:
     METHOD = 'LIST'
@@ -29,7 +28,7 @@ for test in gettestcases():
         try:
             webpage = compat_urllib_request.urlopen(test['url'], timeout=10).read()
         except Exception:
-            print('\nFail: {0}'.format(test['name']))
+            print('\nFail: {}'.format(test['name']))
             continue
 
         webpage = webpage.decode('utf8', 'replace')
@@ -39,7 +38,7 @@ for test in gettestcases():
     elif METHOD == 'LIST':
         domain = compat_urllib_parse_urlparse(test['url']).netloc
         if not domain:
-            print('\nFail: {0}'.format(test['name']))
+            print('\nFail: {}'.format(test['name']))
             continue
         domain = '.'.join(domain.split('.')[-2:])
 
@@ -47,11 +46,11 @@ for test in gettestcases():
 
     if RESULT and ('info_dict' not in test or 'age_limit' not in test['info_dict']
                    or test['info_dict']['age_limit'] != 18):
-        print('\nPotential missing age_limit check: {0}'.format(test['name']))
+        print('\nPotential missing age_limit check: {}'.format(test['name']))
 
     elif not RESULT and ('info_dict' in test and 'age_limit' in test['info_dict']
                          and test['info_dict']['age_limit'] == 18):
-        print('\nPotential false negative: {0}'.format(test['name']))
+        print('\nPotential false negative: {}'.format(test['name']))
 
     else:
         sys.stdout.write('.')
diff --git a/devscripts/fish-completion.py b/devscripts/fish-completion.py
index fb45e0280..d9c0048e2 100755
--- a/devscripts/fish-completion.py
+++ b/devscripts/fish-completion.py
@@ -1,12 +1,10 @@
 #!/usr/bin/env python3
-from __future__ import unicode_literals
-
 import optparse
 import os
-from os.path import dirname as dirn
 import sys
 
-sys.path.insert(0, dirn(dirn((os.path.abspath(__file__)))))
+sys.path.insert(0, os.path.dirname(os.path.dirname(os.path.abspath(__file__))))
+
 import yt_dlp
 from yt_dlp.utils import shell_quote
 
@@ -46,5 +44,5 @@ def build_completion(opt_parser):
         f.write(filled_template)
 
 
-parser = yt_dlp.parseOpts()[0]
+parser = yt_dlp.parseOpts(ignore_config_files=True)[0]
 build_completion(parser)
diff --git a/devscripts/generate_aes_testdata.py b/devscripts/generate_aes_testdata.py
index 0979eee5b..c7d83f1a7 100644
--- a/devscripts/generate_aes_testdata.py
+++ b/devscripts/generate_aes_testdata.py
@@ -1,15 +1,13 @@
 #!/usr/bin/env python3
-from __future__ import unicode_literals
-
 import codecs
-import subprocess
-
 import os
+import subprocess
 import sys
+
 sys.path.insert(0, os.path.dirname(os.path.dirname(os.path.abspath(__file__))))
 
-from yt_dlp.utils import intlist_to_bytes
 from yt_dlp.aes import aes_encrypt, key_expansion
+from yt_dlp.utils import intlist_to_bytes
 
 secret_msg = b'Secret message goes here'
 
diff --git a/devscripts/lazy_load_template.py b/devscripts/lazy_load_template.py
index da89e070d..cdafaf1ef 100644
--- a/devscripts/lazy_load_template.py
+++ b/devscripts/lazy_load_template.py
@@ -1,31 +1,33 @@
-# coding: utf-8
+import importlib
+import random
 import re
 
-from ..utils import bug_reports_message, write_string
+from ..utils import (
+    age_restricted,
+    bug_reports_message,
+    classproperty,
+    write_string,
+)
 
 
 class LazyLoadMetaClass(type):
     def __getattr__(cls, name):
-        if '_real_class' not in cls.__dict__:
+        # "_TESTS" bloat the lazy_extractors
+        if '_real_class' not in cls.__dict__ and name != 'get_testcases':
             write_string(
-                f'WARNING: Falling back to normal extractor since lazy extractor '
-                f'{cls.__name__} does not have attribute {name}{bug_reports_message()}')
-        return getattr(cls._get_real_class(), name)
+                'WARNING: Falling back to normal extractor since lazy extractor '
+                f'{cls.__name__} does not have attribute {name}{bug_reports_message()}\n')
+        return getattr(cls.real_class, name)
 
 
 class LazyLoadExtractor(metaclass=LazyLoadMetaClass):
-    _module = None
-    _WORKING = True
-
-    @classmethod
-    def _get_real_class(cls):
+    @classproperty
+    def real_class(cls):
         if '_real_class' not in cls.__dict__:
-            mod = __import__(cls._module, fromlist=(cls.__name__,))
-            cls._real_class = getattr(mod, cls.__name__)
+            cls._real_class = getattr(importlib.import_module(cls._module), cls.__name__)
         return cls._real_class
 
     def __new__(cls, *args, **kwargs):
-        real_cls = cls._get_real_class()
-        instance = real_cls.__new__(real_cls)
+        instance = cls.real_class.__new__(cls.real_class)
         instance.__init__(*args, **kwargs)
         return instance
diff --git a/devscripts/make_contributing.py b/devscripts/make_contributing.py
index 8b3670d85..361e17d8c 100755
--- a/devscripts/make_contributing.py
+++ b/devscripts/make_contributing.py
@@ -1,7 +1,4 @@
 #!/usr/bin/env python3
-from __future__ import unicode_literals
-
-import io
 import optparse
 import re
 
@@ -16,7 +13,7 @@ def main():
 
     infile, outfile = args
 
-    with io.open(infile, encoding='utf-8') as inf:
+    with open(infile, encoding='utf-8') as inf:
         readme = inf.read()
 
     bug_text = re.search(
@@ -26,7 +23,7 @@ def main():
 
     out = bug_text + dev_text
 
-    with io.open(outfile, 'w', encoding='utf-8') as outf:
+    with open(outfile, 'w', encoding='utf-8') as outf:
         outf.write(out)
 
 
diff --git a/devscripts/make_lazy_extractors.py b/devscripts/make_lazy_extractors.py
index b58fb85e3..8c481bc2d 100644
--- a/devscripts/make_lazy_extractors.py
+++ b/devscripts/make_lazy_extractors.py
@@ -1,105 +1,125 @@
 #!/usr/bin/env python3
-from __future__ import unicode_literals, print_function
-
-from inspect import getsource
-import io
 import os
-from os.path import dirname as dirn
+import optparse
 import sys
+from inspect import getsource
 
-sys.path.insert(0, dirn(dirn((os.path.abspath(__file__)))))
-
-lazy_extractors_filename = sys.argv[1] if len(sys.argv) > 1 else 'yt_dlp/extractor/lazy_extractors.py'
-if os.path.exists(lazy_extractors_filename):
-    os.remove(lazy_extractors_filename)
-
-# Block plugins from loading
-plugins_dirname = 'ytdlp_plugins'
-plugins_blocked_dirname = 'ytdlp_plugins_blocked'
-if os.path.exists(plugins_dirname):
-    os.rename(plugins_dirname, plugins_blocked_dirname)
-
-from yt_dlp.extractor import _ALL_CLASSES
-from yt_dlp.extractor.common import InfoExtractor, SearchInfoExtractor
-
-if os.path.exists(plugins_blocked_dirname):
-    os.rename(plugins_blocked_dirname, plugins_dirname)
-
-with open('devscripts/lazy_load_template.py', 'rt') as f:
-    module_template = f.read()
+sys.path.insert(0, os.path.dirname(os.path.dirname(os.path.abspath(__file__))))
 
-CLASS_PROPERTIES = ['ie_key', 'working', '_match_valid_url', 'suitable', '_match_id', 'get_temp_id']
-module_contents = [
-    module_template,
-    *[getsource(getattr(InfoExtractor, k)) for k in CLASS_PROPERTIES],
-    '\nclass LazyLoadSearchExtractor(LazyLoadExtractor):\n    pass\n']
 
-ie_template = '''
+NO_ATTR = object()
+STATIC_CLASS_PROPERTIES = ['IE_NAME', 'IE_DESC', 'SEARCH_KEY', '_WORKING', '_NETRC_MACHINE', 'age_limit']
+CLASS_METHODS = [
+    'ie_key', 'working', 'description', 'suitable', '_match_valid_url', '_match_id', 'get_temp_id', 'is_suitable'
+]
+IE_TEMPLATE = '''
 class {name}({bases}):
-    _module = '{module}'
+    _module = {module!r}
 '''
-
-
-def get_base_name(base):
-    if base is InfoExtractor:
-        return 'LazyLoadExtractor'
-    elif base is SearchInfoExtractor:
-        return 'LazyLoadSearchExtractor'
-    else:
-        return base.__name__
-
-
-def build_lazy_ie(ie, name):
-    s = ie_template.format(
-        name=name,
-        bases=', '.join(map(get_base_name, ie.__bases__)),
-        module=ie.__module__)
+with open('devscripts/lazy_load_template.py', encoding='utf-8') as f:
+    MODULE_TEMPLATE = f.read()
+
+
+def main():
+    parser = optparse.OptionParser(usage='%prog [OUTFILE.py]')
+    args = parser.parse_args()[1] or ['yt_dlp/extractor/lazy_extractors.py']
+    if len(args) != 1:
+        parser.error('Expected only an output filename')
+
+    lazy_extractors_filename = args[0]
+    if os.path.exists(lazy_extractors_filename):
+        os.remove(lazy_extractors_filename)
+
+    _ALL_CLASSES = get_all_ies()  # Must be before import
+
+    from yt_dlp.extractor.common import InfoExtractor, SearchInfoExtractor
+
+    DummyInfoExtractor = type('InfoExtractor', (InfoExtractor,), {'IE_NAME': NO_ATTR})
+    module_src = '\n'.join((
+        MODULE_TEMPLATE,
+        '    _module = None',
+        *extra_ie_code(DummyInfoExtractor),
+        '\nclass LazyLoadSearchExtractor(LazyLoadExtractor):\n    pass\n',
+        *build_ies(_ALL_CLASSES, (InfoExtractor, SearchInfoExtractor), DummyInfoExtractor),
+    ))
+
+    with open(lazy_extractors_filename, 'wt', encoding='utf-8') as f:
+        f.write(f'{module_src}\n')
+
+
+def get_all_ies():
+    PLUGINS_DIRNAME = 'ytdlp_plugins'
+    BLOCKED_DIRNAME = f'{PLUGINS_DIRNAME}_blocked'
+    if os.path.exists(PLUGINS_DIRNAME):
+        os.rename(PLUGINS_DIRNAME, BLOCKED_DIRNAME)
+    try:
+        from yt_dlp.extractor import _ALL_CLASSES
+    finally:
+        if os.path.exists(BLOCKED_DIRNAME):
+            os.rename(BLOCKED_DIRNAME, PLUGINS_DIRNAME)
+    return _ALL_CLASSES
+
+
+def extra_ie_code(ie, base=None):
+    for var in STATIC_CLASS_PROPERTIES:
+        val = getattr(ie, var)
+        if val != (getattr(base, var) if base else NO_ATTR):
+            yield f'    {var} = {val!r}'
+    yield ''
+
+    for name in CLASS_METHODS:
+        f = getattr(ie, name)
+        if not base or f.__func__ != getattr(base, name).__func__:
+            yield getsource(f)
+
+
+def build_ies(ies, bases, attr_base):
+    names = []
+    for ie in sort_ies(ies, bases):
+        yield build_lazy_ie(ie, ie.__name__, attr_base)
+        if ie in ies:
+            names.append(ie.__name__)
+
+    yield f'\n_ALL_CLASSES = [{", ".join(names)}]'
+
+
+def sort_ies(ies, ignored_bases):
+    """find the correct sorting and add the required base classes so that subclasses can be correctly created"""
+    classes, returned_classes = ies[:-1], set()
+    assert ies[-1].__name__ == 'GenericIE', 'Last IE must be GenericIE'
+    while classes:
+        for c in classes[:]:
+            bases = set(c.__bases__) - {object, *ignored_bases}
+            restart = False
+            for b in bases:
+                if b not in classes and b not in returned_classes:
+                    assert b.__name__ != 'GenericIE', 'Cannot inherit from GenericIE'
+                    classes.insert(0, b)
+                    restart = True
+            if restart:
+                break
+            if bases <= returned_classes:
+                yield c
+                returned_classes.add(c)
+                classes.remove(c)
+                break
+    yield ies[-1]
+
+
+def build_lazy_ie(ie, name, attr_base):
+    bases = ', '.join({
+        'InfoExtractor': 'LazyLoadExtractor',
+        'SearchInfoExtractor': 'LazyLoadSearchExtractor',
+    }.get(base.__name__, base.__name__) for base in ie.__bases__)
+
+    s = IE_TEMPLATE.format(name=name, module=ie.__module__, bases=bases)
     valid_url = getattr(ie, '_VALID_URL', None)
     if not valid_url and hasattr(ie, '_make_valid_url'):
         valid_url = ie._make_valid_url()
     if valid_url:
         s += f'    _VALID_URL = {valid_url!r}\n'
-    if not ie._WORKING:
-        s += '    _WORKING = False\n'
-    if ie.suitable.__func__ is not InfoExtractor.suitable.__func__:
-        s += f'\n{getsource(ie.suitable)}'
-    return s
-
-
-# find the correct sorting and add the required base classes so that subclasses
-# can be correctly created
-classes = _ALL_CLASSES[:-1]
-ordered_cls = []
-while classes:
-    for c in classes[:]:
-        bases = set(c.__bases__) - set((object, InfoExtractor, SearchInfoExtractor))
-        stop = False
-        for b in bases:
-            if b not in classes and b not in ordered_cls:
-                if b.__name__ == 'GenericIE':
-                    exit()
-                classes.insert(0, b)
-                stop = True
-        if stop:
-            break
-        if all(b in ordered_cls for b in bases):
-            ordered_cls.append(c)
-            classes.remove(c)
-            break
-ordered_cls.append(_ALL_CLASSES[-1])
-
-names = []
-for ie in ordered_cls:
-    name = ie.__name__
-    src = build_lazy_ie(ie, name)
-    module_contents.append(src)
-    if ie in _ALL_CLASSES:
-        names.append(name)
-
-module_contents.append(
-    '\n_ALL_CLASSES = [{0}]'.format(', '.join(names)))
-
-module_src = '\n'.join(module_contents) + '\n'
-
-with io.open(lazy_extractors_filename, 'wt', encoding='utf-8') as f:
-    f.write(module_src)
+    return s + '\n'.join(extra_ie_code(ie, attr_base))
+
+
+if __name__ == '__main__':
+    main()
diff --git a/devscripts/make_readme.py b/devscripts/make_readme.py
index 47d6d27b7..fd234bf58 100755..100644
--- a/devscripts/make_readme.py
+++ b/devscripts/make_readme.py
@@ -2,30 +2,29 @@
 
 # yt-dlp --help | make_readme.py
 # This must be run in a console of correct width
-
-from __future__ import unicode_literals
-
-import io
-import sys
 import re
+import sys
 
 README_FILE = 'README.md'
-helptext = sys.stdin.read()
 
+OPTIONS_START = 'General Options:'
+OPTIONS_END = 'CONFIGURATION'
+EPILOG_START = 'See full documentation'
+
+
+helptext = sys.stdin.read()
 if isinstance(helptext, bytes):
-    helptext = helptext.decode('utf-8')
+    helptext = helptext.decode()
 
-with io.open(README_FILE, encoding='utf-8') as f:
-    oldreadme = f.read()
+start, end = helptext.index(f'\n  {OPTIONS_START}'), helptext.index(f'\n{EPILOG_START}')
+options = re.sub(r'(?m)^  (\w.+)$', r'## \1', helptext[start + 1: end + 1])
 
-header = oldreadme[:oldreadme.index('# OPTIONS')]
-footer = oldreadme[oldreadme.index('# CONFIGURATION'):]
+with open(README_FILE, encoding='utf-8') as f:
+    readme = f.read()
 
-options = helptext[helptext.index('  General Options:') + 19:]
-options = re.sub(r'(?m)^  (\w.+)$', r'## \1', options)
-options = '# OPTIONS\n' + options + '\n'
+header = readme[:readme.index(f'## {OPTIONS_START}')]
+footer = readme[readme.index(f'# {OPTIONS_END}'):]
 
-with io.open(README_FILE, 'w', encoding='utf-8') as f:
-    f.write(header)
-    f.write(options)
-    f.write(footer)
+with open(README_FILE, 'w', encoding='utf-8') as f:
+    for part in (header, options, footer):
+        f.write(part)
diff --git a/devscripts/make_supportedsites.py b/devscripts/make_supportedsites.py
index 729f60a0e..d8c53c5e1 100644
--- a/devscripts/make_supportedsites.py
+++ b/devscripts/make_supportedsites.py
@@ -1,47 +1,23 @@
 #!/usr/bin/env python3
-from __future__ import unicode_literals
-
-import io
 import optparse
 import os
 import sys
 
+sys.path.insert(0, os.path.dirname(os.path.dirname(os.path.abspath(__file__))))
 
-# Import yt_dlp
-ROOT_DIR = os.path.join(os.path.dirname(__file__), '..')
-sys.path.insert(0, ROOT_DIR)
-import yt_dlp
+from yt_dlp.extractor import list_extractor_classes
 
 
 def main():
     parser = optparse.OptionParser(usage='%prog OUTFILE.md')
-    options, args = parser.parse_args()
+    _, args = parser.parse_args()
     if len(args) != 1:
         parser.error('Expected an output filename')
 
-    outfile, = args
-
-    def gen_ies_md(ies):
-        for ie in ies:
-            ie_md = '**{0}**'.format(ie.IE_NAME)
-            if ie.IE_DESC is False:
-                continue
-            if ie.IE_DESC is not None:
-                ie_md += ': {0}'.format(ie.IE_DESC)
-            search_key = getattr(ie, 'SEARCH_KEY', None)
-            if search_key is not None:
-                ie_md += f'; "{ie.SEARCH_KEY}:" prefix'
-            if not ie.working():
-                ie_md += ' (Currently broken)'
-            yield ie_md
-
-    ies = sorted(yt_dlp.gen_extractors(), key=lambda i: i.IE_NAME.lower())
-    out = '# Supported sites\n' + ''.join(
-        ' - ' + md + '\n'
-        for md in gen_ies_md(ies))
-
-    with io.open(outfile, 'w', encoding='utf-8') as outf:
-        outf.write(out)
+    out = '\n'.join(ie.description() for ie in list_extractor_classes() if ie.IE_DESC is not False)
+
+    with open(args[0], 'w', encoding='utf-8') as outf:
+        outf.write(f'# Supported sites\n{out}\n')
 
 
 if __name__ == '__main__':
diff --git a/devscripts/posix-locale.sh b/devscripts/posix-locale.sh
deleted file mode 100755
index 0aa7a592d..000000000
--- a/devscripts/posix-locale.sh
+++ /dev/null
@@ -1,6 +0,0 @@
-
-# source this file in your shell to get a POSIX locale (which will break many programs, but that's kind of the point)
-
-export LC_ALL=POSIX
-export LANG=POSIX
-export LANGUAGE=POSIX
diff --git a/devscripts/prepare_manpage.py b/devscripts/prepare_manpage.py
index b763d2d9a..df9abe5ae 100644
--- a/devscripts/prepare_manpage.py
+++ b/devscripts/prepare_manpage.py
@@ -1,7 +1,4 @@
 #!/usr/bin/env python3
-from __future__ import unicode_literals
-
-import io
 import optparse
 import os.path
 import re
@@ -32,14 +29,14 @@ def main():
 
     outfile, = args
 
-    with io.open(README_FILE, encoding='utf-8') as f:
+    with open(README_FILE, encoding='utf-8') as f:
         readme = f.read()
 
     readme = filter_excluded_sections(readme)
     readme = move_sections(readme)
     readme = filter_options(readme)
 
-    with io.open(outfile, 'w', encoding='utf-8') as outf:
+    with open(outfile, 'w', encoding='utf-8') as outf:
         outf.write(PREFIX + readme)
 
 
diff --git a/devscripts/run_tests.bat b/devscripts/run_tests.bat
index b8bb393d9..190d23918 100644
--- a/devscripts/run_tests.bat
+++ b/devscripts/run_tests.bat
@@ -13,4 +13,5 @@ if ["%~1"]==[""] (
     exit /b 1
 )
 
+set PYTHONWARNINGS=error
 pytest %test_set%
diff --git a/devscripts/run_tests.sh b/devscripts/run_tests.sh
index c9a75ba00..e9904ae35 100755
--- a/devscripts/run_tests.sh
+++ b/devscripts/run_tests.sh
@@ -11,4 +11,4 @@ else
     exit 1
 fi
 
-python3 -m pytest "$test_set"
+python3 -bb -Werror -m pytest "$test_set"
diff --git a/devscripts/zsh-completion.py b/devscripts/zsh-completion.py
index 780df0de6..59faea06a 100755
--- a/devscripts/zsh-completion.py
+++ b/devscripts/zsh-completion.py
@@ -1,11 +1,9 @@
 #!/usr/bin/env python3
-from __future__ import unicode_literals
-
 import os
-from os.path import dirname as dirn
 import sys
 
-sys.path.insert(0, dirn(dirn((os.path.abspath(__file__)))))
+sys.path.insert(0, os.path.dirname(os.path.dirname(os.path.abspath(__file__))))
+
 import yt_dlp
 
 ZSH_COMPLETION_FILE = "completions/zsh/_yt-dlp"
@@ -45,5 +43,5 @@ def build_completion(opt_parser):
         f.write(template)
 
 
-parser = yt_dlp.parseOpts()[0]
+parser = yt_dlp.parseOpts(ignore_config_files=True)[0]
 build_completion(parser)