How to Mock a Server-Side Load Balancer in Python

import itertools
import random

class LoadBalancer:
    def __init__(self, servers=None):
        self.servers = servers if servers else ["server1", "server2", "server3"]
        self.counter = itertools.count(1)

    def round_robin(self):
        return next(self.counter) % len(self.servers)

    def random_selection(self):
        return random.randint(0, len(self.servers) - 1)

    def least_connections(self):
        return self.connections.index(min(self.connections))

    def get_server(self, algorithm="round_robin"):
        if algorithm == "round_robin":
            index = self.round_robin()
        elif algorithm == "random":
            index = self.random_selection()
        elif algorithm == "least_connections":
            index = self.least_connections()
        else:
            raise ValueError(f"Unknown algorithm: {algorithm}")
        return self.servers[index]


if __name__ == "__main__":
    lb = LoadBalancer()
    print("Round robin:", lb.get_server())
    print("Round robin:", lb.get_server())
    print("Random:", lb.get_server())