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On Ubuntu 14.04 Python 3.4 is installed by default. As recommended by PEP-394 you can use python and python2 to run Python v2 (2.7) and python3 to run Python v3 (3.4).


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Python3.4 is already installed on your system, you just need to call it with python3 instead of python


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You should already have it install: python3 -V To install idle 3: sudo apt-get install idle-python3.4


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python 3.4 is installed on the stable release of Ubuntu 14.04. You need to use python3 to use python 3.4. For example, to compile a script file.py, use: python3 file.py This will use python 3.4 to interpret your program or you can use the shebang to make it executable. The first line of your program should be: #!/usr/bin/python3 and then use chmod +x ...


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There's an issue with the pre-compiled Cython C files (compatibility with Python 3.4.0) with the pypi version. To properly install scikit-learn, use the git repo instead (tested ok on 14.04): sudo pip3 install git+https://github.com/scikit-learn/scikit-learn.git


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If you simply want Python 3.4 on Ubuntu and want to avoid the trouble of compiling from source, consider installing it from Felix Krull's Python PPA Add the PPA $ sudo add-apt-repository ppa:fkrull/deadsnakes Update Apt cache $ sudo apt-get update Install Python 3.4 $ sudo apt-get install python3.4


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Set py-shell-name to python3, for example by using Meta+x customize-variable Returnpy-shell-name


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Install primary versions of python with: sudo make install and install secondary versions with: sudo make altinstall For example, I do not have any Python installations on my system and I want to install 3 versions: 2.7, 3.3 and 3.4. I want to make 2.7 the primary installation (as python) and all the others as secondary (as python3.3 and ...



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