get default browser path with Python (on Windows10)

get_default_browser.py

import re
from winreg import HKEY_CURRENT_USER, HKEY_CLASSES_ROOT, OpenKey, QueryValueEx

def get_browser_name() -> str:
    register_path = r'Software\Microsoft\Windows\Shell\Associations\UrlAssociations\https\UserChoice'
    with OpenKey(HKEY_CURRENT_USER, register_path) as key:
        return str(QueryValueEx(key, "ProgId")[0])

def format_cmd(s:str) -> str:
    exe_path = re.sub(r"(^.+exe)(.*)", r"\1", s)
    return exe_path.replace('"', "")

def get_exe_path(name:str) -> str:
    register_path = r'{}\shell\open\command'.format(name)
    fullpath = ""
    with OpenKey(HKEY_CLASSES_ROOT, register_path) as key:
        cmd = str(QueryValueEx(key, "")[0])
        fullpath = format_cmd(cmd)
    return fullpath

def main():
    prog_name = get_browser_name()
    return get_exe_path(prog_name)

if __name__ == '__main__':
    print(main())