CentOS7 安裝python3

CentOS7系統默認安裝了python2.7

$ python --version
Python 2.7.5

怎麼安裝python3？

下載python3安裝包

$ wget https://www.python.org/ftp/python/3.6.3/Python-3.6.3.tgz
--2018-11-27 15:16:23--  https://www.python.org/ftp/python/3.6.3/Python-3.6.3.tgz
正在解析主機 www.python.org (www.python.org)... 151.101.108.223, 2a04:4e42:1a::223
正在鏈接 www.python.org (www.python.org)|151.101.108.223|:443... 已鏈接。
已發出 HTTP 請求，正在等待迴應... 200 OK
長度：22673115 (22M) [application/octet-stream]
正在保存至: 「Python-3.6.3.tgz」

100%[====================================================================================================================================>] 22,673,115  3.94MB/s 用時 21s

2018-11-27 15:16:45 (1.02 MB/s) - 已保存 「Python-3.6.3.tgz」 [22673115/22673115])

$ ls
Python-3.6.3.tgz
$ tar -xvf Python-3.6.3.tgz
$ ls
Python-3.6.3  Python-3.6.3.tgz
$ cd Python-3.6.3
$ ls
aclocal.m4    config.sub  configure.ac  Grammar  install-sh  LICENSE  Makefile.pre.in  Modules  Parser  PCbuild   pyconfig.h.in  README.rst  Tools
config.guess  configure   Doc           Include  Lib         Mac      Misc             Objects  PC      Programs  Python         setup.py

執行配置

$ ./configure

執行編譯

make

執行安裝

make install

若是須要安裝失敗的提示：

Traceback (most recent call last):
  File "/root/downloads/Python-3.6.3/Lib/runpy.py", line 193, in _run_module_as_main
    "__main__", mod_spec)
  File "/root/downloads/Python-3.6.3/Lib/runpy.py", line 85, in _run_code
    exec(code, run_globals)
  File "/root/downloads/Python-3.6.3/Lib/ensurepip/__main__.py", line 4, in <module>
    ensurepip._main()
  File "/root/downloads/Python-3.6.3/Lib/ensurepip/__init__.py", line 189, in _main
    default_pip=args.default_pip,
  File "/root/downloads/Python-3.6.3/Lib/ensurepip/__init__.py", line 102, in bootstrap
    _run_pip(args + [p[0] for p in _PROJECTS], additional_paths)
  File "/root/downloads/Python-3.6.3/Lib/ensurepip/__init__.py", line 27, in _run_pip
    import pip
zipimport.ZipImportError: can't decompress data; zlib not available

須要安裝Development tools和zlib相關工具

$ yum groupinstall "Development tools"
$ yum install zlib-devel bzip2-devel openssl-devel ncurses-devel sqlite-devel readline-develtk-devel gdbm-devel db4-devel libpcap-devel xz-devel

執行完後再執行安裝make install

至此，安裝完成。查看python3版本

$ python3 --version
Python 3.6.3

參考

http://www.runoob.com/python3/python3-install.html

http://www.javashuo.com/article/p-ovbbgzus-mk.html