验证numpy是否安装的小技巧

numpy

如下

>>> from numpy import *
>>> eye(4)
array([[1., 0., 0., 0.],
       [0., 1., 0., 0.],
       [0., 0., 1., 0.],
       [0., 0., 0., 1.]])

Brew

mac更新到big sur之后，brew运行就不正常。在发现使用更新中科大源之前，我才用的是如下方法，也能解决问题，只不过在imac上可以正常安装opencv，而mac pro上则失败了，后来在两台电脑上全部重新安装了中科大版本的brew，才最终解决，下面将原操作做个记录。

• 首先，在使用brew list或brew doctor后，出现的是下面的问题

  Traceback (most recent call last):
  11: from /usr/local/Homebrew/Library/Homebrew/brew.rb:23:in `<main>'
  
  10: from /usr/local/Homebrew/Library/Homebrew/brew.rb:23:in `require_relative'
  
  9: from /usr/local/Homebrew/Library/Homebrew/global.rb:37:in `<top (required)>'
  
  8: from /usr/local/Homebrew/Library/Homebrew/vendor/portable-ruby/2.6.3/lib/ruby/2.6.0/rubygems/core_ext/kernel_require.rb:54:in `require'
  
  7: from /usr/local/Homebrew/Library/Homebrew/vendor/portable-ruby/2.6.3/lib/ruby/2.6.0/rubygems/core_ext/kernel_require.rb:54:in `require'
  
  6: from /usr/local/Homebrew/Library/Homebrew/os.rb:3:in `<top (required)>'
  

• 然后，删除xcode工具，并重新安装

  sudo rm -rf /Library/Developer/CommandLineTools
  sudo xcode-select --install
  

• 最后，更新brew即可

  brew upgrade
  

  当然，最好的方法是

  brew update-reset
  brew cleanup
  

  参考
  brew更新问题
  更换科大brew源