How to install the latest version of Python on Cent. OSThis tutorial will show you how to install the latest version of Python 2 and Python 3 on Cent. OS by compiling from source. Linux/LDP/LDP/LGNET/179/misc/xkcd/debian_main.png' alt='Subprocess Pre Installation Script Error' title='Subprocess Pre Installation Script Error' />The examples below are for Python 2. Python 3. 6. 3, but the procedure is the same for any modern version of Python. If you are using Cent. OS 6 you can use this tutorial to install both Python 2. Python 3. 6. x. For Cent. OS 7 only the Python 3. Warning Do not install Python 2. Cent. OS 7 using these instructions. Your system will end up having two different python. This will likely cause difficult to diagnose problems. This tutorial should work for all versions of Cent. OS 6 and Cent. OS 7, and it will probably work on the corresponding RHEL distributions as well. I have verified it on Cent. OS 6. 9 6. 4 bit and Cent. OS 7 1. 61. 1 6. This tutorial is meant for people that are comfortable with compiling and installing applications from source. What is the problem Cent. OS ships with Python as a critical part of the base system. Because it is a critical part it is not getting updated, other than to plug security vulnerabilities. Why this guide Many people still believe that learning Linux is difficult, or that only experts can understand how a Linux system works. Installation Instructions. The recommended way to bootstrap setuptools on any system is to download ezsetup. Python environment. This tutorial will show you how to install the latest version of Python 2 and Python 3 on CentOS 6. You can also use it to install the latest version of Python 3 on. The lack of updates means that Cent. OS 6 users are stuck with Python 2. August 2. 01. 0, and Cent. OS 7 users are stuck with Python 2. May 2. 01. 3. Solving the problem. Utilities such as yum will break if the default Python interpreter is upgraded or replaced. The trick is to install new versions of Python in usrlocal or some other non standard location so that they can live side by side with the system version. Things to consider. Before you compile and install Python there are a few things you should know andor consider Unicode. Python has a long and complicated history when it comes to Unicode support. Subprocess Pre Installation Script Error' title='Subprocess Pre Installation Script Error' />Unless you have very specific reasons you should configure Python 2. UTF 3. 2 support. This increases memory usage but improves compatibility. In Python 3. 3 the Unicode support has been completely rewritten and strings are automatically stored using the most efficient encoding possible. You enable UTF 3. Python 2. 7 by passing enable unicodeucs. Shared library. You should compile Python as a shared library. All modern Linux distros ship with Python compiled as a shared library, and there are third party tools such as modwsgi and Blender that wont work without it. To make sure the executable can find its shared library you need to pass some additional flags to the configure command LDFLAGS Wl, rpath usrlocallib. Use make altinstall to prevent problems. It is critical that you use make altinstall when you install your custom version of Python. If you use the normal make install you will end up with two different versions of Python in the filesystem both named python. This can lead to problems that are very hard to diagnose. Preparations install prerequisites. In order to compile Python you must first install the development tools and a few extra libs. The extra libs are not strictly needed to compile Python but without them your new Python interpreter will be quite useless. Execute all the commands below as root either by temporarily logging in as root or by using sudo. Start by making sure your system is up to date. Compilers and related tools. Libraries needed during compilation to enable all features of Python. If you are on a clean minimal install of Cent. OS you also need the wget tool. Start by making sure your system is up to date yum update Compilers and related tools yum groupinstall ydevelopment tools Libraries needed during compilation to enable all features of Python yum install yzlib devel b If you are on a clean minimal install of Cent. OS you also need the wget tool yum install ywget. Download, compile and install Python. Here are the commands to download, compile and install Python. Python 2. 7. 1. 4. Python 2. 7. 1. 4. Python 2. 7. 1. 4. Python 2. 7. 1. 4. LDFLAGS Wl, rpath usrlocallib. Python 3. 6. 3. wget http python. Python 3. 6. 3. tar. Python 3. 6. 3. tar. Python 3. 6. 3. configure prefixusrlocal enable shared LDFLAGS Wl, rpath usrlocallib. Python 2. 7. 1. 4 wget http python. Python 2. 7. 1. 4. Python 2. 7. 1. 4. Python 2. 7. 1. 4. LDFLAGS Wl, rpath usrlocallibmake makealtinstall Python 3. Python 3. 6. 3. tar. Python 3. 6. 3. tar. Python 3. 6. 3. configure prefixusrlocal enable shared LDFLAGS Wl, rpath usrlocallibmake makealtinstall. After running the commands above your newly installed Python interpreter will be available as usrlocalbinpython. The system version of Python 2. You might also want to strip symbols from the shared library to reduce the memory footprint. Strip the Python 2. Strip the Python 3. Strip the Python 2. Strip the Python 3. Installupgrade pip, setuptools and wheel. Each Python interpreter on your system needs its own install of pip, setuptools and wheel. The easiest way to install or upgrade these packages is by using the get pip. First get the script. Then execute it using Python 2. Python 3. 6. python. With pip installed you can now do things like this. First get the script wget https bootstrap. Then execute it using Python 2. Python 3. 6 python. With pip installed you can now do things like this pip. The packages will end up in usrlocallibpython. X. Ysite packages where X. Y is the Python version. Whats next If you are using Python 2. I strongly recommend that you install virtualenv and learn how to use it. Virtualenv makes it possible to create isolated Python environments. If you are using Python 3. Each isolated Python environment also called sandbox can have its own Python version and packages. This is very useful when you work on multiple projects or on different versions of the same project. Create your first isolated Python environment. Install virtualenv for Python 2. Use the built in functionality in Python 3. Check the system Python interpreter version. This will show Python 2. Activate the my. 27project sandbox. Check the Python version in the sandbox it should be Python 2. Deactivate the sandbox. Activate the my. 36project sandbox. Check the Python version in the sandbox it should be Python 3. Deactivate the sandbox. Install virtualenv for Python 2. Use the built in functionality in Python 3. Check the system Python interpreter version python version This will show Python 2. Activate the my. 27project sandbox source my. Check the Python version in the sandbox it should be Python 2. Deactivate the sandbox deactivate Activate the my. Check the Python version in the sandbox it should be Python 3. Deactivate the sandbox deactivate. Changelog. 20. 17 1. Examples updated with Python 2. Examples updated with Python 3. Examples updated with Python 3. Add warning about not installing Python 2. Cent. OS 7 since it already has 2. Examples updated with Python 2. Python 3. 6. 0. Mention that this also works for installing Python 3. Cent. OS 7. Added expat devel to the list of prerequisites. Removed ldconfig instructions. Tilapia Biology Culture And Nutrition Pdf. Added instructions for stripping the shared libraries. Changed the instructions for pipsetuptools to use the get pip. Examples updated with Python 3. The Python versions used in the examples have been updated to 2. The list of library prerequisites has been extended so that more features are compiled into Python. New parameters for compiling Python with a shared library and for enabling Unicode UTF 3. Python 2. 7 and Python 3.