Catalog

1.Ubuntu The version of is as follows

2. Default query Python edition

3. Upgrade to 3.6.6

3.1  Download source tar Pack and unzip

3.2 install

3.3 About yum About apt

3.4 Soft connection

3.5 Many versions

4.Python The official online version

reference

1.Ubuntu The version of is as follows

2. Default query Python edition

Use python -V Command query current python Version of , Be careful V It's capital

zhouc52@ubuntu-master:~/ download $ python -V
Python 2.7.12

3. Upgrade to 3.6.6

3.1  Download source tar Pack and unzip

wget http://www.python.org/ftp/python/3.6.6/Python-3.6.6.tgz
tar -xzvf Python-3.6.6.tgz

3.2 install

First you need to compile , And then install it , Before compiling , First in /usr/local Directory create a new folder python3 As a new directory, avoid covering old ones , Be careful ： To switch to root user （ Switch users to su command ）, Otherwise, you will be prompted that you have no permission .

mkdir /usr/local/python3

Start compilation

Switch to the directory after decompression , Then enter the following command

./configure -prefix=/usr/local/python3

This process takes a little longer , After execution , Type in the command
 

make
make install

If installed for the first time , Input... For the first time make When , Will fail , The report has the following mistakes ：

zipimport.ZipImportError: can’t decompress data

This is a problem , The main reason is the lack of zlib Related toolkits lead to , install zlib* Just go .

3.3 About yum About apt

install zlib* The way , The most popular way to find it on the Internet is as follows

yum -y install zlib*

I try to use commands like this , But the prompt did not install yum, Use sudo apt-get install yum install yum after , Indicates that there is no available warehouse , Prompt for execution yum repolist all see , It turns out that 0.

Here's how ,ubuntu The default package management is not yum, It is dpkg, During installation , Use apt-get. Then install zlib Use the following command ：

sudo apt-get install zlib*

Installation successful ！ Then execute again make and make install, Finish compiling and installing , Let's create a soft link .

3.4 Soft connection

First change the old version of the link , The order is as follows

mv /usr/bin/python /usr/bin/python_old2

Now , Enter at the command line python_old2 -V, You'll see the version number of the old version .

by python3 Create a soft connection

ln -s /usr/local/python3/bin/python3 /usr/bin/python

And then execute python -V, You'll see that the version number is already 3.6.6 了 , Be accomplished ！

3.5 Many versions

In this way , Multiple can be installed python edition , adopt ln -s Specify different soft links , for example ：

4.Python The official online version

The following links have all of them python Version of , Can pass wget download , It can also be downloaded directly from the browser

https://www.python.org/ftp/python/

reference

【1】Linux Next python Detailed steps of installation and upgrade | Python2 upgrade Python3

【2】Linux command -- Remove soft connection