python代碼怎么運行，python3運行python2_python2升級到python3

安裝gcc readline* 等,不然會出問題yum install zlib-devel bzip2-devel openssl-devel ncurses-devel sqlite-devel readline-devel tk-devel gcc make libffi-devel -y

1. 從Python官網到獲取Python3的包， 切換到目錄/usr/local/src#wget https://www.python.org/ftp/python/3.5.1/Python-3.5.1.tar.xz

python代碼怎么運行，2. 使用命令如下命令進行解壓縮：1 xz -d Python-3.5.1.tar.xz2 tar -xf Python-3.5.1.tar

3. 在/usr/local路徑下創建目錄--python3.5， 為第4步的安裝目錄$mkdir /usr/local/python3.5

4. 編譯安裝(會自動安裝pip-7.1.2)$cd /usr/local/src/Python-3.5.1

python運行界面啥樣的、#./configure --prefix=/usr/local/python3.5

#make all

#make install

Python3.5。#make clean

#make distclean

5. 進入安裝的絕對路徑，檢查是否安裝成功$ /usr/local/python3.5/bin/python3.5 -V

python界面、Python 3.5.1

6.查看環境變量，啟動python時默認按照PATH的順序進行查找，在/usr/bin中的python此時為Python2.6的。$echo $PATH

/usr/lib/qt-3.3/bin:/usr/local/bin:/usr/bin:/bin:/usr/local/sbin:/usr/sbin:/sbin:/home/gordon/bin

7.修改軟連接，啟動python時指向python3.5備份python

mv /usr/bin/python /usr/bin/python2.6.6

sudo ln -s /usr/local/python3.5/bin/python3 /usr/bin/python

8. 驗證默認是否啟動python3.5$ python -V

Python 3.5.1

9. 升級完python之后，yum就不好用了，需要修改/usr/bin/yum,改為使用python2.6.6#!/usr/bin/python2.6.6