樹莓派PIP安裝OPENCV報錯，COULD NOT FIND A VERSION THAT SATISFIES THE REQUIREMENT CV2

樹莓派PIP安裝OPENCV報錯，COULD NOT FIND A VERSION THAT SATISFIES THE REQUIREMENT CV2 (FROM VERSIONS: )NO MATCHING DISTRIBUTION FOUND FOR CV2

前言

我在使用pip install opencv-python 時報錯

Could not find a version that satisfies the requirement opencv (from versions: ) No matching distribution found for opencv

樹莓派的鏡像是默認裝的鏡像，沒怎麼裝過其餘東西的。我查看了python的版本，python是2.7版本的，ubuntu鏡像默認是裝好了python2。分析緣由，應該是python2版本太久，沒法找到知足opencv需求的版本。而後我將python2 升級到python3後安裝，發現安裝成功。

具體操做

1.執行 sudo apt-get install python3 命令安裝python3

sudo apt-get install python3
複製代碼

2.執行 python3 -V 查看 python3是否安裝成功

python3 -V
複製代碼

3.執行 pip3 install opencv-python

pip3 install opencv-python
複製代碼

安裝好後如圖

（安裝opencv-python）

4.執行 pip3 list 驗證 pip3中是否安裝了opencv-python

pip3 list複製代碼

（檢驗pip3中是安裝了opencv-python）

5.進入python3 執行 import cv2 as cv 查看opencv-python 是否成功安裝進python3

python3
import cv2 as cv 
複製代碼

（查看opencv-python 是否成功安裝進python3）

此時出現了個坑，報錯：ImportError:libcblas.so.3:cannot open shared object file:No such file or directory
這個報錯的意思是沒有安裝libcblas的庫，此時安裝Blas 的依賴項就解決了。安裝libcblas庫的命令是：
sudo apt-get install libatlas-base-dev

sudo apt-get install libatlas-base-dev複製代碼

或
sudo apt-get install libgflags-dev

sudo apt-get install libgoodle-glog-dev
sudo apt-get install liblmdb-dev
sudo apt-get install python
sudo apt-get install python-dev
sudo apt-get install python-numpy
sudo apt-get install ipython
sudo apt-get install ipython-notebook
sudo apt-get install python-sklearn
sudo apt-get install python-skimage
sudo apt-get install python-protobuf

sudo apt-get install libgflags-dev

sudo apt-get install libgoodle-glog-dev 
sudo apt-get install liblmdb-dev 
sudo apt-get install python 
sudo apt-get install python-dev 
sudo apt-get install python-numpy 
sudo apt-get install ipython 
sudo apt-get install ipython-notebook 
sudo apt-get install python-sklearn 
sudo apt-get install python-skimage 
sudo apt-get install python-protobuf
複製代碼

這裏演示 命令sudo apt-get install libatlas-base-dev

（安裝Blas 的依賴項）

6.再次進入python3 執行 import cv2 as cv 查看opencv-python 是否成功安裝進python3
（若第五步遇到坑則執行第六步）

（安裝完成）