Could not find a version that satisfies the requirement pyserial>=3.0 (from -r /问题处理

$ brew install python3

提示:

Error: Can't create update lock in /usr/local/var/homebrew/locks!

Fix permissions by running:

  sudo chown -R $(whoami) /usr/local/var/homebrew

Error: Permission denied - /usr/local/var/homebrew/locks/python3.brewing

执行如下:

$sudo chown -R $(whoami) /usr/local/var/homebrew

$ which python3

终端输出

/usr/local/bin/python3

上面方法没解决参考下面链接安装3.0以上版本:

https://www.jianshu.com/p/f44cb9328d46

安装上面会出现路径不对的问题,

需求改下

$which pip3

/System/Library/Frameworks/Python.framework/Versions/3.7/bin/pip3

$sudo vim /System/Library/Frameworks/Python.framework/Versions/3.7/bin/pip3

把!#后的路径改成上面which pip3输出的路径即可

查看是pip否安装好了,输入如下命令能否看到用法说明

$pip

$pip3

如输入pip提示下面信息,则是版本号不对,输入pip3查看版本,修改/user/local/bin/pip文件里对应的版本号

Traceback (most recent call last):

  File "/usr/local/bin/pip", line 5, in <module>

    from pkg_resources import load_entry_point

  File "/System/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages/pkg_resources/__init__.py", line 3191, in <module>

参照上面链接安装会导致xcode不能用,报错,网上有建议不要删除系统的python2.7;如果已经删了,则重新装回:

$brew install python@2

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转载自blog.csdn.net/hxl5955/article/details/99770213