1.安装python3

1.1下载python源码包

网址：https://www.python.org/downloads/release/python-362/

下载地址：https://www.python.org/ftp/python/3.6.2/Python-3.6.2.tgz

1.1.1安装python前的库环境，非常重要

yum install gcc patch libffi-devel python-devel  zlib-devel bzip2-devel openssl-devel ncurses-devel sqlite-devel readline-devel tk-devel gdbm-devel db4-devel libpcap-devel xz-devel -y

1.2下载，解压安装源码包

wget https://www.python.org/ftp/python/3.6.2/Python-3.6.2.tgz


xz -d Python-3.4.7.tar.xz
tar -xf Python-3.4.7.tar
#yum install gcc -y
./configure --prefix=/opt/python
make && make install
---------------------
用python查看默认安装路径
>>> import sys
>>> sys.path
['', '/usr/local/lib/python36.zip', '/usr/local/lib/python3.6', 
'/usr/local/lib/python3.6/lib-dynload', '/usr/local/lib/python3.6/site-packages']
--------------------
python3.4默认没添加path
在/etc/profile最后一行添加
export PATH=$PATH:/opt/python/bin
然后
source /etc/profile

#python快捷path就被改了，yum用的python2，麻烦

1.2.3 牛逼的python Tab自动补全

下载setuptool 3.4以上已经默认安装了easy_install-3.4

没什么用

下载readline

#yum install -y readline-devel -y 
#pip install readline

tab补全
#python startup file
import readline,rlcompleter
#tab completion
readline.parse_and_bind('tab:complete')
----------------------------
python历史记录
#history file
import os
history_file = os.path.join(os.environ["HOME"],".pythonhistory")