Ubuntu16.04 sets python3 as the default and installs some libraries

Ubuntu’s default Python is 2.7, so when installing the Python package, the py2 package is installed.

Use the alternatives mechanism to change py3 to default.

Execute in shell:

sudo update-alternatives --install /usr/bin/python python /usr/bin/python2 100sudo update-alternatives --install /usr/bin/python python /usr/bin/python3 150

The effect is as follows:

At this time, enter the installation command on the command terminal The package that supports py3 will be automatically installed.

Numpy:

sudo apt-get install python-numpy

Scipy:

sudo apt-get install python-scipy

Matplotlib:

sudo apt-get install python-matplotlib

Pandas:

sudo apt-get install python-pandas

Statistical modeling analysis tool statsModels:

sudo apt-get install python-statsmodels

Machine learning library scikit-learn:

sudo apt-get install python-sklearn

xgboost：

sudo -H pip install --pre xgboost

seaborn, a drawing tool, is a supplement to matplotlib, making more attractive pictures:

sudo pip install seaborn

If you want to switch to Python2, execute:

sudo update-alternatives --config python

Follow the prompts and enter the selected number and press Enter. Executing the above command under py2 will install the installation package corresponding to py2, and the system will automatically choose to download it.

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