[Python 3.6+] Xat mobile login

import json
import sys
import xml.etree.ElementTree as ET
import requests
from pathlib import Path


def login(username, password, force=False):
    p = Path(f'.data/')
    p.mkdir(parents=True, exist_ok=True)
    p = Path(f'.data/{username.lower()}.json')
    p.touch()

    with p.open() as f:
        data = f.read()

    if not data:
        data = '{}'

    data = json.loads(data)

    if not isinstance(data, dict):
        if not force:
            return data[1]
        device_id = data[0]
    else:
        device_id = data.get('d', '')

    headers = {
        'Pragma': 'no-cache',
        'Origin': 'https://xat.com',
        'Accept-Encoding': 'gzip, deflate, br',
        'Accept-Language': 'en-US,en;q=0.8',
        'User-Agent': 'Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/58.0.3029.110 Safari/537.36',
        'Content-type': 'application/x-www-form-urlencoded',
        'Accept': '*/*',
        'Cache-Control': 'no-cache',
        'Referer': 'https://xat.com/login',
        'Connection': 'keep-alive',
    }

    params = {
        'v': '1.12.0',
        'm': '7',
        'sb': '1',
        '': ''
    }

    payload = {
        'json': json.dumps({
            'M': '0',
            'P': '',
            'd': device_id,
            'n': username,
            'nfy': '',
            'oi': '0',
            'p': password,
            'pt': '3',
            't': ''
        })
    }

    response = requests.post('https://mt.xat.com/web_gear/chat/mlogin2.php?',
                             params=params, headers=headers, data=payload)

    data = response.json()

    if isinstance(data, int):
        print(f'Error #{data}')
        if data == 1:
            print('Login blocked. Wait a while before trying again.')
        print('I actually have no clue what any of the rest mean, good luck.')
        sys.exit()

    if 'd' in data:
        print(data['s'])
        with p.open('w') as f:
            json.dump(data, f)
        sys.exit()

    elif 'v' in data:
        data = ET.XML(data['v'])
        if 'e' in data.attrib:
            print('Incorrect password.')
            sys.exit()
        with p.open('w') as f:
            json.dump([device_id, data.attrib], f)

        data = data.attrib

    return data