python3.8安装uiautomator2失败报错： python setup.py egg_info Check the logs for full command output.

安装uiautomator2报错：ERROR: Command errored out with exit status 1: python setup.py egg_info Check the logs for full command output.

    ERROR: Command errored out with exit status 1:
     command: 'c:\users\lyn\appdata\local\programs\python\python39\python.exe' -c 'import sys, setuptools, tokenize; sys.argv[0] = '"'"'C:\\Users\\lyn\\AppData\\Local\\Temp\\pip-install-n05ckf2s\\uiautomator2\\setup.py'"'"'; __file__='"'"'C:\\Users\\lyn\\AppData\\Local\\Temp\\pip-install-n05ckf2s\\uiautomator2\\setup.py'"'"';f=getattr(tokenize, '"'"'open'"'"', open)(__file__);code=f.read().replace('"'"'\r\n'"'"', '"'"'\n'"'"');f.close();exec(compile(code, __file__, '"'"'exec'"'"'))' egg_info --egg-base 'C:\Users\lyn\AppData\Local\Temp\pip-pip-egg-info-uqbu4blh'
         cwd: C:\Users\lyn\AppData\Local\Temp\pip-install-n05ckf2s\uiautomator2\
    Complete output (34 lines):
    WARNING: The wheel package is not available.
    WARNING: The repository located at pypi.douban.com is not a trusted or secure host and is being ignored. If this repository is available via HTTPS we recommend you use HTTPS instead, otherwise you may silence this warning and allow it anyway with '--trusted-host pypi.douban.com'.
    ERROR: Could not find a version that satisfies the requirement pbr (from versions: none)
    ERROR: No matching distribution found for pbr
    Traceback (most recent call last):
      File "c:\users\lyn\appdata\local\programs\python\python39\lib\site-packages\setuptools\installer.py", line 128, in fetch_build_egg
        subprocess.check_call(cmd)
      File "c:\users\lyn\appdata\local\programs\python\python39\lib\subprocess.py", line 373, in check_call
        raise CalledProcessError(retcode, cmd)
    subprocess.CalledProcessError: Command '['c:\\users\\lyn\\appdata\\local\\programs\\python\\python39\\python.exe', '-m', 'pip', '--disable-pip-version-check', 'wheel', '--no-deps', '-w', 'C:\\Users\\lyn\\AppData\\Local\\Temp\\tmpr104kg9r', '--quiet', 'pbr']' returned non-zero exit status 1.

    The above exception was the direct cause of the following exception:

    Traceback (most recent call last):
      File "", line 1, in <module>
      File "C:\Users\lyn\AppData\Local\Temp\pip-install-n05ckf2s\uiautomator2\setup.py", line 8, in <module>
        setuptools.setup(setup_requires=['pbr'], python_requires='>=3.6', pbr=True)
      File "c:\users\lyn\appdata\local\programs\python\python39\lib\site-packages\setuptools\__init__.py", line 164, in setup
        _install_setup_requires(attrs)
      File "c:\users\lyn\appdata\local\programs\python\python39\lib\site-packages\setuptools\__init__.py", line 159, in _install_setup_requires
        dist.fetch_build_eggs(dist.setup_requires)
      File "c:\users\lyn\appdata\local\programs\python\python39\lib\site-packages\setuptools\dist.py", line 699, in fetch_build_eggs
        resolved_dists = pkg_resources.working_set.resolve(
      File "c:\users\lyn\appdata\local\programs\python\python39\lib\site-packages\pkg_resources\__init__.py", line 779, in resolve
        dist = best[req.key] = env.best_match(
      File "c:\users\lyn\appdata\local\programs\python\python39\lib\site-packages\pkg_resources\__init__.py", line 1064, in best_match
        return self.obtain(req, installer)
      File "c:\users\lyn\appdata\local\programs\python\python39\lib\site-packages\pkg_resources\__init__.py", line 1076, in obtain
        return installer(requirement)
      File "c:\users\lyn\appdata\local\programs\python\python39\lib\site-packages\setuptools\dist.py", line 758, in fetch_build_egg
        return fetch_build_egg(self, req)
      File "c:\users\lyn\appdata\local\programs\python\python39\lib\site-packages\setuptools\installer.py", line 130, in fetch_build_egg
        raise DistutilsError(str(e)) from e
    distutils.errors.DistutilsError: Command '['c:\\users\\lyn\\appdata\\local\\programs\\python\\python39\\python.exe', '-m', 'pip', '--disable-pip-version-check', 'wheel', '--no-deps', '-w', 'C:\\Users\\lyn\\AppData\\Local\\Temp\\tmpr104kg9r', '--quiet', 'pbr']' returned non-zero exit status 1.
    ----------------------------------------
ERROR: Command errored out with exit status 1: python setup.py egg_info Check the logs for full command output.

python版本：3.8.8（>=3.8）
执行命令：pip install --pre uiautomator2
解决办法：卸载python3.8，安装python3.7，下面看官方说明

再次执行命令，安装成功

解决思路：降级python版本
有更好的思路可以一起讨论，避免踩坑，这里仅作参考