Python 3 has been installed in Linux and has been upgraded.

Python 3 has been installed in Linux and has been upgraded.
Install Python 3 in Linux to complete the upgrade

python

First download the sourcetarPackage

You can use the built-in linux download tool wget to download, as shown below:

 
 

  
  
# wget http://www.python.org/ftp/python/3.3.0/Python-3.3.0.tgz
 
 

You can also download other versions from the official website or use a browser if you have an interactive interface. There are many ways to download the source code. The following code is used for installation.

After the download is complete, go to the download directory and decompress and unpack the package:

 
 

  
  
tar -zxvf Python-3.1.2.tar
 
 

Enter the decompressed folder

 
 

  
  
cd Python-3.1.2
 
 

Before compilation/usr/localCreate a folderpython3(pythonTo avoid overwriting the old version), you need to usesudoPermission

 
 

  
  
mkdir /usr/local/python3
 
 

Start compilation and Installation

 
 

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

  
  
make
  
  

  
  
make install
 
 

--prefix=/usr/local/python3GeneratemakefileFile, where the installation directory (linuxThe installation under is to copy the file to the system path after compiling the link) specified,makeThe link will be compiled.makefileTarget file,make installRunmakefileTo complete the installation.

The old version is not overwritten./usr/bin/pythonThe link is changed to another name.

 
 

  
  
mv /usr/bin/python /usr/bin/python_old
 
 

Create a new versionpython.

 
 

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

Enter

 
 

  
  
Python # displays the new version of python.
  
  

  
  
Python 3.1.2 (r312:79147, Oct 21 2012, 01:03:21))
  
  
[GCC 3.2.2 20030222 (Red Hat Linux 3.2.2-5)] on linux2
  
  
Type "help", "copyright", "credits" or "license" for more information.
  
  
>>>
 
 

If you do not create a new installation pathpython3Is directly installed by default.pythonIt should overwritelinuxIf you want to keep the original version, so this method is best.

You can alsopython2Andpython3Coexistence, that is, do not change the name of the old version.python3.

 
 

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

In this way, enterpythonWill enter the old version; enterpython3Will enter the new version, the two coexist, you need to use