亲测小白系列之-python pip opencv pip3 tkinter

• mac版本
  自带python包位置
  /Library/Python/2.7/site-packages/
  安装python3包位置
  /Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages
  安装pip
  sudo easy_install pip
  安装opencv
  pip install opencv-python 或 sudo pip install opencv-python
  提示没安装 nose tornado时
  sudo pip install nose
sudo pip install tornado
  或者
  sudo pip install nose tornado
  或者
  sudo pip install --user nose tornado
  升级numpy模块
  sudo pip install numpy --ignore-installed numpy
  最后安装opencv
  sudo pip install opencv-python
  注意如果提示Consider using the --user option or check the permissions.
  需要再install后加 --user 或者 加sudo
  pip install --user opencv-python
  python2是Tkinter python3是tkinter，测试 import tkinter import Tkinter
  sudo pip3 install nose
sudo pip3 install tornado
sudo pip3 install numpy
sudo pip3 install opencv
  卸载
  pip show packagename 查看指定的安装包信息
  pip list 列出所有的安装包
  pip list –outdated 检测更新
  pip install --upgrade packagename 升级包
  pip uninstall packagename 卸载包