You are an Expert PYTHON DEVELOPER. Your task is to SIMPLIFY, REFACTOR, and OPTIMIZE a given Python code.

Here's your step-by-step guide:

1. REVIEW the existing code thoroughly to understand its functionality and identify any redundancies.
2. IDENTIFY sections of the code that can be simplified without changing the output, focusing on readability and maintainability.
3. REFACTOR the code by renaming variables and functions with more descriptive names that adhere to Python naming conventions.
4. COMBINE multiple operations into single lines where appropriate, ensuring that clarity is not compromised.
5. REMOVE any unnecessary comments, whitespace, or code that does not contribute to functionality.
6. OPTIMIZE loops and data structures for efficiency, considering time complexity and memory usage.
7. TEST the refactored code after each change to ensure it still performs as expected without introducing any bugs.

You MUST ensure that the final version of the code maintains its original functionality while being more efficient and easier to understand.

Remember, I’m going to tip $300K for a BETTER SOLUTION!

Now Take a Deep Breath.

```python
#!/usr/bin/env python3

import asyncio
import random
import sys
import urllib.parse
import argparse
import contextlib
import subprocess
import os.path
import requests

DESCRIPTION = "Downloads all Tor Relay IP addresses from onionoo.torproject.org and checks whether random Relays are available."

class TCPSocketConnectChecker:
    def __init__(self, host, port, timeout=10.0):
        self.host = host
        self.port = port
        self.timeout = timeout
        self.connection_status = None

    def __repr__(self):
        return f'{self.host if self.host.find(":") == -1 else f"[{self.host}]"}:{self.port}'

    async def connect(self):
        try:
            # Open connection
            reader, writer = await asyncio.wait_for(
                asyncio.open_connection(self.host, self.port), self.timeout)
            # And close it
            writer.close()
            await writer.wait_closed()
            self.connection_status = True
            return (True, None)
        except (OSError, asyncio.TimeoutError) as e:
            self.connection_status = False
            return (False, e)

class TorRelayGrabber:
    def __init__(self, timeout=10.0, proxy=None):
        self.timeout = timeout
        self.proxy = {'https': proxy} if proxy else None

    def _grab(self, url):
        with requests.get(url, timeout=int(self.timeout), proxies=self.proxy) as r:
            return r.json()

    def grab(self, preferred_urls_list=None):
        BASEURL = "https://onionoo.torproject.org/details?type=relay&running=true&fields=fingerprint,or_addresses,country"
        # Use public CORS proxy as a regular proxy in case if onionoo.torproject.org is unreachable
        URLS = [
            BASEURL,
            f"https://icors.vercel.app/?{urllib.parse.quote(BASEURL)}",
            "https://github.com/ValdikSS/tor-onionoo-mirror/raw/master/details-running-relays-fingerprint-address-only.json",
            "https://bitbucket.org/ValdikSS/tor-onionoo-mirror/raw/master/details-running-relays-fingerprint-address-only.json",
        ]
        if preferred_urls_list:
            for pref_url in preferred_urls_list:
                URLS.insert(0, pref_url)

        for url in URLS:
            try:
                return self._grab(url)
            except Exception as e:
                print(
                    f"Can't download Tor Relay data from/via {urllib.parse.urlparse(url).hostname}: {e}",
                    file=sys.stderr,
                )

    def grab_parse(self, preferred_urls_list=None):
        grabbed = self.grab(preferred_urls_list)
        if grabbed:
            grabbed = grabbed["relays"]
        return grabbed


class TorRelay:
    def __init__(self, relayinfo):
        self.relayinfo = relayinfo
        self.fingerprint = relayinfo["fingerprint"]
        self.iptuples = self._parse_or_addresses(relayinfo["or_addresses"])
        self.reachable = []

    def reachables(self):
        return [
            f'{i[0] if i[0].find(":") == -1 else f"[{i[0]}]"}:{i[1]} {self.fingerprint}'
            for i in self.reachable
        ]

    def _reachable_str(self):
        return "\n".join(self.reachables())

    def __repr__(self):
        return self._reachable_str() if self.reachable else str(self.relayinfo)

    def __len__(self):
        return len(self.reachable)

    def _parse_or_addresses(self, or_addresses):
        ret = []
        for address in or_addresses:
            parsed = urllib.parse.urlparse(f"//{address}")
            ret.append((parsed.hostname, parsed.port))
        return ret

    async def check(self, timeout=10.0):
        for i in self.iptuples:
            s = TCPSocketConnectChecker(i[0], i[1], timeout=timeout)
            sc = await s.connect()
            if sc[0]:
                self.reachable.append(i)

        return bool(self.reachable)


def start_browser():
    browser_cmds=("Browser/start-tor-browser --detach", "Browser/firefox.exe")
    for cmd in browser_cmds:
        if os.path.exists(cmd.split(" ")[0]):
            subprocess.Popen(cmd.split(" "))
            break


def str_list_with_prefix(prefix, list_):
    return "\n".join(prefix + r for r in list_)


def chunked_list(l, size):
    for i in range(0, len(l), size):
        yield l[i:i+size]


async def main_async(args):
    NUM_RELAYS = args.num_relays
    TIMEOUT = args.timeout
    outstream = args.outfile
    torrc_fmt = args.torrc_fmt
    BRIDGE_PREFIX = "Bridge " if torrc_fmt else ""

    WORKING_RELAY_NUM_GOAL = args.working_relay_num_goal
    print(
        f"Tor Relay Scanner. Will scan up to {WORKING_RELAY_NUM_GOAL} working relays (or till the end)",
        file=sys.stderr,
    )
    print("Downloading Tor Relay information from Tor Metrics…", file=sys.stderr)
    relays = TorRelayGrabber(timeout=TIMEOUT, proxy=args.proxy).grab_parse(args.url)
    if not relays:
        print("Tor Relay information can't be downloaded!", file=sys.stderr)
        return 1
    print("Done!", file=sys.stderr)

    random.shuffle(relays)

    if args.preferred_country:
        countries = {c: i for i, c in enumerate(args.preferred_country.split(","))}
        # 1000 is just a sufficiently large number for default sorting
        relays = sorted(relays, key=lambda x: countries.get(x.get("country"), 1000))

    if args.port:
        relays_new = []
        for relay in relays:
            for ipport in TorRelay(relay).iptuples:
                if ipport[1] in args.port:
                    # deep copy needed here, otherwise subsequent loop
                    # modifies "previous" value
                    relay_copy = relay.copy()
                    relay_copy["or_addresses"] = [
                        f'{ipport[0] if ipport[0].find(":") == -1 else f"[{ipport[0]}]"}:{ipport[1]}'
                    ]
                    relays_new.append(relay_copy)
        relays = relays_new
        if not relays:
            print("There are no relays within specified port number constraints!", file=sys.stderr)
            print("Try changing port numbers.", file=sys.stderr)
            return 2

    working_relays = []
    numtries = (len(relays) + NUM_RELAYS - 1) // NUM_RELAYS
    for ntry, chunk in enumerate(chunked_list(relays, NUM_RELAYS)):
        if len(working_relays) >= WORKING_RELAY_NUM_GOAL:
            break

        relaynum = len(chunk)
        test_relays = [TorRelay(r) for r in chunk]

        print(
            f"\nTry {ntry+1}/{numtries}, We'll test the following {relaynum} random relays:", file=sys.stderr)
        for relay in test_relays:
            print(relay, file=sys.stderr)
        print(file=sys.stderr)

        if ntry:
            print(f"Found {len(working_relays)} good relays so far. Test {ntry+1}/{numtries} started…", file=sys.stderr)
        else:
            print("Test started…", file=sys.stderr)

        tasks = [asyncio.create_task(relay.check(TIMEOUT)) for relay in test_relays]
        fin = await asyncio.gather(*tasks)
        print(file=sys.stderr)

        print("The following relays are reachable this try:", file=sys.stderr)
        for relay in test_relays:
            if relay:
                print(str_list_with_prefix(BRIDGE_PREFIX, relay.reachables()), file=outstream)
                if sys.stdout != outstream:
                    print(str_list_with_prefix(BRIDGE_PREFIX, relay.reachables()), file=sys.stderr)
                working_relays.append(relay)
        if not any(test_relays):
            print("No relays are reachable this try.", file=sys.stderr)

    if ntry > 1:
        print(file=sys.stderr)
        print("All reachable relays:", file=sys.stderr)
        for relay in working_relays:
            if relay:
                print(str_list_with_prefix(BRIDGE_PREFIX, relay.reachables()), file=sys.stderr)
        if not any(working_relays):
            print("No relays are reachable, at all.", file=sys.stderr)

    if any(working_relays):
        if torrc_fmt:
            print("UseBridges 1", file=outstream)
        if args.prefsjs:
            try:
                with open(args.prefsjs, "r+") as f:
                    prefsjs = str()
                    for line in f:
                        if "torbrowser.settings.bridges." not in line:
                            prefsjs += line
                    # Ugly r.reachables() array flattening, as it may have more than one reachable record.
                    for num, relay in enumerate(sum((r.reachables() for r in working_relays), [])):
                        prefsjs += f'user_pref("torbrowser.settings.bridges.bridge_strings.{num}", "{relay}");\n'
                    prefsjs += 'user_pref("torbrowser.settings.bridges.enabled", true);\n'
                    prefsjs += 'user_pref("torbrowser.settings.bridges.source", 2);\n'
                    f.seek(0)
                    f.truncate()
                    f.write(prefsjs)
            except OSError as e:
                print("Can't open Tor Browser configuration:", e, file=sys.stderr)

    if args.start_browser:
        start_browser()


def main():
    parser = argparse.ArgumentParser(description=DESCRIPTION)
    parser.add_argument('-n', type=int, dest='num_relays', default=30, help='The number of concurrent relays tested.')
    parser.add_argument('-g', '--goal', type=int, dest='working_relay_num_goal', default=5, help='Test until at least this number of working relays are found')
    parser.add_argument('-c', '--preferred-country', type=str, default="", help='Preferred country list, comma-separated. Example: se,gb,nl,de')
    parser.add_argument('--timeout', type=float, default=10.0, help='Socket connection timeout')
    parser.add_argument('-o', '--outfile', type=argparse.FileType('w'), default=sys.stdout, help='Output reachable relays to file')
    parser.add_argument('--torrc', action='store_true', dest='torrc_fmt', help='Output reachable relays in torrc format (with "Bridge" prefix)')
    parser.add_argument('--proxy', type=str, help='Set proxy for onionoo information download. Format: http://user:pass@host:port; socks5h://user:pass@host:port')
    parser.add_argument('--url', type=str, action='append', help='Preferred alternative URL for onionoo relay list. Could be used multiple times.')
    parser.add_argument('-p', type=int, dest='port', action='append', help='Scan for relays running on specified port number. Could be used multiple times.')
    parser.add_argument('--browser', type=str, nargs='?', metavar='/path/to/prefs.js', dest='prefsjs',
                        const='Browser/TorBrowser/Data/Browser/profile.default/prefs.js',
                        help='Install found relays into Tor Browser configuration file (prefs.js)')
    parser.add_argument('--start-browser', action='store_true', help='Launch browser after scanning')
    args = parser.parse_args()
    with contextlib.suppress(KeyboardInterrupt, SystemExit):
        return asyncio.run(main_async(args))

```