安装python3.5

1. 通过命令行安装Python3.5,执行命令：

sudo apt-get install python3.5 

2. 由于Ubuntu底层采用的是Python2.，Python3.与Python2.*是不兼容的，但是不能卸载Python2,随意

卸载会出现意想不到的后果，只要把默认的Python指向Python3即可。
注：Python3.5默认安装在/usr/local/lib/python3.5目录下，需要删除默认python link文件，重新建立连接

关系，输入如下两条命令：

sudo rm  /usr/bin/python 
sudo  ln  -s  /usr/bin/python3.5    /usr/bin/python   

Ubuntu下pip3的安装、升级、卸载

安装

sudo apt-get install python3-pip

升级

sudo pip3 install --upgrade pip

卸载

sudo apt-get remove python3-pip

相关库函数

matplotlib

In case anyone else stumbles upon this, just use

sudo apt-get install python3-matplotlib

There are many packages involved with matplotlib and using apt-get instead of pip this is the officially recommended approach.

使用方法

%matplotlib inline
import matplotlib.pyplot as plt

numpy

See, when you install any software using pip, it defaults to the path: "/usr/local/lib/python3.5/dist-packages/numpy" for installing that software.

Only the root user has access to this area of control (better security) and so, you'll need to the keyword sudo before such commands to enable that software (in this case, pip) to perform it's operations with a root user access level.

So, your command will now become:

sudo pip3 install numpy

pandas

pandas install documents:

Python2 and Python3 uses different version of pandas.

For Python3 you can install it using apt install:

sudo apt-get install python3-pandas

In order to install it using pip, you should use pip3 for Python3:

sudo apt-get install python3-pip
sudo -H pip3 install pandas