Read and write 2 line different location with module fileinput error can't read first line edit and just edit another line

testing.py

import re, sys, os, fileinput

configFile = 'sshd_config'
if os.path.isfile(configFile) and os.access(configFile, os.R_OK):
    # code here
    try:
        # config = open(configFile, 'r')
        with open(configFile, 'r') as searchconfig:
            for config in searchconfig:
                if 'Port' in config:
                    old_port = config
            # for rootlogin in searchconfig:
                if 'Banner' in config:
                    banner = config

        # print(root_access)
        print(old_port)
        print(banner)

        with fileinput.FileInput(configFile, inplace=True, backup='.bak') as conf:
            new_port = input('Set Port SSH(default Port 22): ')
            default = '22'
            active = input('Do you want activate Banner Login?(Default: disable)[Y|n] ').lower()
            banner_disable = '#Banner /etc/issue.net'

            print(active)
            for configPort in conf:
                if not new_port:
                	print(configPort.replace(old_port, ('Port %s\n' % default)), end="")
                else:
                	print(configPort.replace(old_port, ('Port %s\n' % new_port)), end="")

                for banner_conf in conf:
                    if active == 'y':
                        # print(active)
                        print(banner_conf.replace(banner, (re.sub('^\#','', banner))), end="")
                    elif not active or active == 'n':
                        # print(active)
                        print(banner_conf.replace(banner, (banner_disable)), end="")

        conf.close()
    except IOError:
        print('Something wrong')