linux ubuntu install python 3.7
sudo apt-get install python3.7
how to install python3 in ubuntu
sudo apt update
sudo apt install software-properties-common
sudo add-apt-repository ppa:deadsnakes/ppa
sudo apt update
sudo apt install python3.8
sudo apt-get install python3.5
UPDATE
Thanks to Don Kirkby who highlight that there is a new recommended PPA.
The updated one is ppa:deadsnakes/ppa, so the complete command is the following:
sudo add-apt-repository ppa:deadsnakes/ppa
If you are using Ubuntu, you can install it adding a PPA; so you can proceed in this way:
sudo add-apt-repository ppa:fkrull/deadsnakes
sudo apt-get update
sudo apt-get install python3.5
If this procedure doesn't work, is possible that your Ubuntu version not supported it. So i think that you can install in this way:
sudo apt-get install libssl-dev openssl
wget https://www.python.org/ftp/python/3.5.0/Python-3.5.0.tgz
tar xzvf Python-3.5.0.tgz
cd Python-3.5.0
./configure
make
sudo make install
sudo apt-get install python2-pip
sudo add-apt-repository universe
sudo apt update
sudo apt install python2
curl https://bootstrap.pypa.io/pip/2.7/get-pip.py --output get-pip.py
sudo python2 get-pip.py
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