centos 6.x 设置默认的 python 2.6 为 python 2.7详解程序员

centos 6.x 的yum使用的是python 2.6，现在需要更新系统默认python为python 2.7

安装 python2.7

# yum install python27-python  python27-python-devel

查询 python2.7 的安装位置

# rpm -ql python27-python 
/opt/rh/python27/root/usr/bin/pydoc 
/opt/rh/python27/root/usr/bin/python 
/opt/rh/python27/root/usr/bin/python2 
/opt/rh/python27/root/usr/bin/python2.7 
/opt/rh/python27/root/usr/share/doc/python27-python-2.7.13 
/opt/rh/python27/root/usr/share/doc/python27-python-2.7.13/LICENSE 
/opt/rh/python27/root/usr/share/doc/python27-python-2.7.13/README 
/opt/rh/python27/root/usr/share/man/man1/python.1.gz 
/opt/rh/python27/root/usr/share/man/man1/python2.1.gz 
/opt/rh/python27/root/usr/share/man/man1/python2.7.1.gz

# rpm -ql python27-python-devel 
/etc/rpm/macros.python2.python27 
/opt/rh/python27/root/usr/bin/python-config 
/opt/rh/python27/root/usr/bin/python2-config 
/opt/rh/python27/root/usr/bin/python2.7-config 
 
/opt/rh/python27/root/usr/lib64/libpython2.7.so 
/opt/rh/python27/root/usr/lib64/pkgconfig 
/opt/rh/python27/root/usr/lib64/pkgconfig/python-2.7.pc 
/opt/rh/python27/root/usr/lib64/pkgconfig/python.pc 
/opt/rh/python27/root/usr/lib64/pkgconfig/python2.pc 
/opt/rh/python27/root/usr/lib64/python2.7/config/Setup 
/opt/rh/python27/root/usr/lib64/python2.7/config/Setup.config 
/opt/rh/python27/root/usr/lib64/python2.7/config/Setup.local 
/opt/rh/python27/root/usr/lib64/python2.7/config/config.c 
/opt/rh/python27/root/usr/lib64/python2.7/config/config.c.in 
/opt/rh/python27/root/usr/lib64/python2.7/config/install-sh 
/opt/rh/python27/root/usr/lib64/python2.7/config/libpython2.7.so 
/opt/rh/python27/root/usr/lib64/python2.7/config/makesetup 
/opt/rh/python27/root/usr/lib64/python2.7/config/python.o 
/opt/rh/python27/root/usr/lib64/python2.7/distutils/command/wininst-6.0.exe 
/opt/rh/python27/root/usr/lib64/python2.7/distutils/command/wininst-7.1.exe 
/opt/rh/python27/root/usr/lib64/python2.7/distutils/command/wininst-8.0.exe 
/opt/rh/python27/root/usr/lib64/python2.7/distutils/command/wininst-9.0-amd64.exe 
/opt/rh/python27/root/usr/lib64/python2.7/distutils/command/wininst-9.0.exe 
 
/usr/lib/rpm/redhat/brp-python-bytecompile-with-scl-python

替换系统默认的python

# which python 
/usr/bin/python 
# cd /usr/bin 
# ls -l /usr/bin|grep -i python 
-rwxr-xr-x. 1 root root      20152 May 12  2016 abrt-action-analyze-python 
-rwxr-xr-x. 2 root root       9032 Aug 18  2016 python 
lrwxrwxrwx. 1 root root          6 Apr 19 17:48 python2 -> python 
-rwxr-xr-x. 2 root root       9032 Aug 18  2016 python2.6 
-rwxr-xr-x. 1 root root       1418 Aug 18  2016 python2.6-config 
lrwxrwxrwx. 1 root root         16 Apr 19 17:54 python-config -> python2.6-config 
 
# md5sum python2.6 python 
583180f2d76da4062c8c4bd4dd364d10  python2.6 
583180f2d76da4062c8c4bd4dd364d10  python 
# mv python python.bak 
 
# ln -s /opt/rh/python27/root/usr/bin/python2.7 python 
# ls -l /usr/bin|grep -i python 
-rwxr-xr-x. 1 root root      20152 May 12  2016 abrt-action-analyze-python 
lrwxrwxrwx. 1 root root         39 Apr 19 18:34 python -> /opt/rh/python27/root/usr/bin/python2.7 
lrwxrwxrwx. 1 root root          6 Apr 19 17:48 python2 -> python 
-rwxr-xr-x. 2 root root       9032 Aug 18  2016 python2.6 
-rwxr-xr-x. 1 root root       1418 Aug 18  2016 python2.6-config 
-rwxr-xr-x. 2 root root       9032 Aug 18  2016 python.bak 
lrwxrwxrwx. 1 root root         16 Apr 19 17:54 python-config -> python2.6-config

修改ld

# vi /etc/ld.so.conf 
include ld.so.conf.d/*.conf 
/usr/local/lib 
/usr/local/lib64 
/opt/rh/python27/root/usr/lib64/ 
 
# ldconfig 
# python 
Python 2.7.13 (default, Apr 12 2017, 06:53:51)  
[GCC 4.4.7 20120313 (Red Hat 4.4.7-18)] on linux2 
Type "help", "copyright", "credits" or "license" for more information. 
>>> 

修改yum使用的python 2.6

# which yum 
/usr/bin/yum 
# vi /usr/bin/yum 
调整前 #!/usr/bin/python 
调整后 #!/usr/bin/python2.6

至此，centos 6.x 上更换 python 2.6 为 2.7 完成。