How to Install python3.5

#demo.sh
#!/bin/bash

PY=python3.5
PIP=pip3.5

Check if Python 3 is installed
if type "$PY" > /dev/null 2>&1; then
    echo "$PY already installed. Please run the next script."
    exit
fi

# Check running as root
if [ "$EUID" -ne 0 ]; then
    echo "Please run $0 as root"
 

    exit
fi


# Confirm to install Python 3
read -p "Press Y/y to install $PY: " -n 1 -r
echo
if [[ $REPLY =~ ^[Yy]$ ]]
then
    yum -y install https://centos7.iuscommunity.org/ius-release.rpm
    yum -y install python35u python35u-devel python35u-pip
fi

How to install and config virtualenv to python3.5

0. pip install -i https://pypi.doubanio.com/simple virtualenv

1. virtualenv --python=python3.5 --no-site-packages venv

2. source venv/bin/activate

3. pip install -i https://pypi.doubanio.com/simple -r requirements.txt

How to install and config virtualenv to python2.7

0. pip install -i https://pypi.doubanio.com/simple virtualenv
 


1. virtualenv --python=python2 --no-site-packages venv

2. source venv/bin/activate

3. pip install -i https://pypi.doubanio.com/simple -r requirements.txt

virtualenv start and exit

start: source venv/bin/activate
exit: deactivate