安裝環境
系統版本：CentOS 7.4（自帶Python2.7）
安裝版本：Python3.6
安裝插件：virtualenv、virtualenvwrapper
which python
1.安裝依賴包（切記安裝）
yum -y groupinstall "Development tools"
yum -y install zlib-devel bzip2-devel openssl-devel ncurses-devel sqlite-devel readline-devel tk-devel gdbm-devel db4-devel libpcap-devel xz-devel
下載Python3安裝包
wget https://www.python.org/ftp/python/3.6.2/Python-3.6.2.tar.xz
mkdir /usr/local/python3
tar -xvJf Python-3.6.2.tar.xz
cd Python-3.6.2
./configure --prefix=/usr/local/python3
make && make install
安裝Python3時，會自動安裝pip。假如沒有，需要自己手動安裝。這裏我的有了
yum -y install python-pip
創建軟鏈接
ln -s /usr/local/python3/bin/python3 /usr/bin/python3
ln -s /usr/local/python3/bin/pip3 /usr/bin/pip3
安裝完輸入python3 試試。
創建虛擬環境
pip3 install --upgrade pip
pip3 install virtualenv
pip3 install virtualenvwrapper
vi ~/.bashrc
在文末填入以下代碼並保存
VIRTUALENVWRAPPER_PYTHON=/usr/local/python3/bin/python3 # 指定virtualenvwrapper執行的python版本
export WORKON_HOME=$HOME/.virtualenvs # 指定虛擬環境存放目錄，.virtualenvs目錄名可自擬
source /usr/local/bin/virtualenvwrapper.sh # virtualenvwrapper.sh所在目錄
source ~/.bashrc
mkvirtualenv -p python3 py3_flask
workon py3_flask
中間有錯的
-bash: /usr/local/bin/virtualenvwrapper.sh: No such file or directory
查找virtualenvwrapper.sh所在目錄
find / -name "virtualenvwrapper.sh"
添加正確這個