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how to install python3.5 on ubuntu 14.04
Felix Krull runs a PPA offering basically any version of Python (seriously, there is 2.3.7 build for vivid...) for many Ubuntu releases at
https://launchpad.net/~fkrull/+archive/ubuntu/deadsnakes
Do the usual:
sudo add-apt-repository ppa:fkrull/deadsnakes
sudo apt-get update
sudo apt-get install python3.5
It will not overwrite your existing python3.4 which is still symlinked as python3. If you want python3.5 to be the default python3, change the symlink
cd /usr/bin
sudo rm python3
sudo ln -s python3.5 python3
Actually, DON'T change the symlink! There are apparently many system functions that don't work properly with python3.5. I tried this and afterwards couldn't open a terminal, software updater,...
The upgrade to Wily will adapt the meta-package python3 to point to python3.5. I don't expect any breakage, but at this point the foreign repository is not needed anymore. So to be really safe, you can purge the PPA before doing the upgrade.
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