ATX -uiautomator2 如何让脚本并行执行？谢谢

大神，我在安装 uiautomator2 时出现如下错误，但 pbr（4.3.0)）我已经安装过，有没有什么解决办法？谢谢
pip install --pre uiautomator2
Complete output from command python setup.py egg_info:
Couldn't find index page for 'pbr' (maybe misspelled?)
No local packages or download links found for pbr
File "g:\pro_tools\python27\lib\site-packages\distribute-0.6.14-py2.7.egg\setuptools\command\easy_install.py", line 576, in easy_install
raise DistutilsError(msg)
distutils.errors.DistutilsError: Could not find suitable distribution for Requirement.parse('pbr')

----------------------------------------
Command "python setup.py egg_info" failed with error code 1 in c:\users\admini~1\appdata\local\temp\pip-install-dsuvtw\uiautomator2\

keycode 类型是 String 吧