• 由于openssl出现问题，在源码编译安装python3的时候，会一直不成功，我测试了几个openssl的版本最后编译的时候都不能通过，最后根据python3给出的提示，安装了LibreSSL来代替openssl，LibreSSL是在看到openssl有问题的基础上开发出来的用来替代openssl的

#!/bin/bash
WORK_DIR=`mktemp -d`

#some Dependency software
yum install gcc make wget libffi-devel unzip zlib zlib-devel bzip2 bzip2-devel ncurses ncurses-devel readline readline-devel openssl  -y
yum install openssl-devel openssl-static xz lzma xz-devel sqlite sqlite-devel gdbm gdbm-devel tk tk-devel git -y

downloadPip(){
    curl https://bootstrap.pypa.io/get-pip.py -o get-pip.py
}

downloadSetuptools(){
    wget https://files.pythonhosted.org/packages/b0/d1/8acb42f391cba52e35b131e442e80deffbb8d0676b93261d761b1f0ef8fb/setuptools-40.6.2.zip
}

installLibreSSL(){
    cd $WORK_DIR && [ ! -f $WORK_DIR/libressl-2.8.1.tar.gz ] && wget https://ftp.openbsd.org/pub/OpenBSD/LibreSSL/libressl-2.8.1.tar.gz
    tar zxvf libressl-2.8.1.tar.gz && cd libressl-2.8.1
    ./configure --prefix=/opt/libressl && make install
    mv /usr/bin/openssl /usr/bin/openssl.bak 
    mv /usr/include/openssl /usr/include/openssl.bak 
    ln -s /opt/libressl/bin/openssl /usr/bin/openssl 
    ln -s /opt/libressl//include/openssl /usr/include/openssl
    echo "/opt/libressl/lib" > /etc/ld.so.conf.d/libressl.conf
    ldconfig 
}

installPython2(){
    #get python2 and install python2
    cd $WORK_DIR && [ ! -f $WORK_DIR/Python-2.7.15.tar.xz ] && wget https://www.python.org/ftp/python/2.7.15/Python-2.7.15.tar.xz
    xz -d Python-2.7.15.tar.xz && tar -xvf  Python-2.7.15.tar && cd Python-2.7.15
    ./configure --prefix=/opt/python2
    make  && make install  && make clean  && make distclean

    #install setuptools
    cd $WORK_DIR && [ ! -f $WORK_DIR/setuptools-40.6.2.zip ] && downloadSetuptools
    unzip setuptools-40.6.2.zip && cd setuptools-40.6.2
    /opt/python2/bin/python2 ./setup.py install

    #install pip
    cd $WORK_DIR && [ ! -f $WORK_DIR/get-pip.py ] && downloadPip
    /opt/python2/bin/python2 $WORK_DIR/get-pip.py
}

installPython3(){
    installLibreSSL
    cd $WORK_DIR && [  ! -f $WORK_DIR/Python-3.7.1.tar.xz ] && wget https://www.python.org/ftp/python/3.7.1/Python-3.7.1.tar.xz
    xz -d Python-3.7.1.tar.xz && tar -xvf  Python-3.7.1.tar && cd Python-3.7.1
    export LDFLAGS="-L /opt/libressl/lib"
    export CPPFLAGS="-I /opt/libressl/include"
    export PKG_CONFIG_PATH="/opt/libressl/lib/pkgconfig"
    ./configure --prefix=/opt/python3 --enable-shared  CFLAGS=-fPIC ##--enable-optimizations 是优化选项(LTO，PGO 等)加上这个 flag 编译后，性能有 10% 左右的优化,但会花更多的时间
    make  && make install  && make clean && make distclean
    echo "/opt/python3/lib" > /etc/ld.so.conf.d/python3.conf
    ldconfig
    /opt/python3/bin/pip3 install --upgrade pip
}

echo -e "\033[31m Which python version do you want to install  :  \033[0m"
select var in "Python2" "Python3" "Python2andPython3" "Exit"
do
    case $var in
        "Python2")
            installPython2
            exit
            ;;
        "Python3")
            installPython3
            exit
            ;;
        "Python2andPython3")
            installPython2
            installPython3
            exit
            ;;
        "Exit")
            exit
            ;;
        *)
            echo "Please chose 1 || 2 || 3 || 4"
            ;;
    esac
done

#clear
cd  && [ -d $WORK_DIR ] && rm $WORK_DIR -rf