Python script to make HTTP connection from fixed port

fixed_port_http.py

from requests.adapters import HTTPAdapter
from requests.packages.urllib3.poolmanager import PoolManager
import requests


class SourcePortAdapter(HTTPAdapter):
    """"Transport adapter" that allows us to set the source port."""
    def __init__(self, port, *args, **kwargs):
        self._source_port = port
        super(SourcePortAdapter, self).__init__(*args, **kwargs)

    def init_poolmanager(self, connections, maxsize, block=False):
        self.poolmanager = PoolManager(
            num_pools=connections, maxsize=maxsize,
            block=block, source_address=('', self._source_port))
        
s = requests.session()
s.mount('http://127.0.0.1:8080', SourcePortAdapter(54321))
s.get('http://127.0.0.1:8080/my_uri?with=args')