How can I connect to the localhost from any browser in the same network?

Question

so I have a python webserver and I can access the site when I connect to the localhost on my pc. I tried to connect to the server via my ipv4 address and followed the top awnsers here How can I access my localhost from my Android device?. However not one awnser helped me and I cant connect from my mobile phone to my ipv4 address as well as from my pc to the ipv4 address, localhost works. What I already did:

• went to wifi settings and set wifi to private
• allowed python in windows firewall
• created a new rule in windows system panel and opened the port (8000)

Not any of those helped me to connect. Does someone know how I can fix this? Here is the code of my python server:

from http.server import BaseHTTPRequestHandler, HTTPServer
from datetime import datetime

hostName = "localhost"
serverPort = 8000
file_name = "C://Users//einfa//Desktop//server//chat.html"
all_messages = []

class MyServer(BaseHTTPRequestHandler):
    def get_message(self):
        message = ''
        start = False
        for symbol in self.path:
            if start:
                message += symbol

            if symbol == '=':
                start = True
        
        fixed_message = ''
        for symbol in message:
            if symbol == "+":
                fixed_message += ' '
            else:
                fixed_message += symbol
        return fixed_message

    def do_GET(self):
        file_text = ""
        self.send_response(200)
        self.send_header("Content-type", "text/html")
        self.end_headers()
        file = open(file_name, "r")
        
        now = datetime.now()
        current_time = now.strftime("%H:%M")

        if not self.get_message() in ["", " "]:
            all_messages.append("<li><div id=\"down\" class=\"message\">"+self.get_message()+"</div></li><strong>"+str(current_time)+"</strong>\n")

        for a in range(len(all_messages)-1):
            all_messages[a] = all_messages[a].replace("id=\"down\"", " ")

        for i in range(61):
            file_text += str(file.readline())
        
        for element in all_messages:
            file_text += element

        for i in range(1000):
            file_text += str(file.readline())
        file.close()

        self.wfile.write(bytes(file_text, "utf-8"))

if __name__ == "__main__":        
    webServer = HTTPServer((hostName, serverPort), MyServer)
    print("Server started http://%s:%s" % (hostName, serverPort))

    try:
        webServer.serve_forever()
    except KeyboardInterrupt:
        pass

    webServer.server_close()
    print("Server stopped.")

Thanks for reading