查看 python 的版本
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[root@localhost ~]
# python -V
Python 2.4.3
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下载并安装 Python-2.7.5
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[root@localhost ~]
# wget http://python.org/ftp/python/2.7.5/Python-2.7.5.tar.bz2
[root@localhost ~]
# tar -jxvf Python-2.7.5.tar.bz2
[root@localhost ~]
# cd Python-2.7.5
[root@localhost Python-2.7.5]
# ./configure
[root@localhost Python-2.7.5]
# make
[root@localhost Python-2.7.5]
# make install
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建立软连接，使系统默认的 python 指向 python2.7
正常情况下，即使 python2.7 安装成功后，系统默认指向的 python 仍然是 2.4.3 版本，考虑到 CentOS5.6 系统中的 yum 是基于 python2.4 才能正常工作，所以不要卸载 python2.4 版本。 那么 如何 实现将系统默认的 python 指向到 2.7 版本呢？
未做修改前：
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[root@localhost Python-2.7.5]
# ll /usr/bin/python*
-rwxr-xr-x 2 root root 8304 Mar 6 2011
/usr/bin/python
lrwxrwxrwx 1 root root 6 Jul 4 2013
/usr/bin/python2
-> python
-rwxr-xr-x 2 root root 8304 Mar 6 2011
/usr/bin/python2
.4
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[root@localhost Python-2.7.5]
# rm -f /usr/bin/python2
[root@localhost Python-2.7.5]
# mv /usr/bin/python /usr/bin/python2.4
[root@localhost Python-2.7.5]
# ln -s /usr/local/bin/python2.7 /usr/bin/python
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1.删除之前的软连接；
2.将默认 python 重命名为 python2.4 以给 yum 使用（这里可以省略该步骤，因为 python2.4 本身就存在）；
3.将默认 python 软连接到 python2.7 上（这里要看新装的 python2.7 是否已存在到 python 的软连接）。
检验 python 指向是否成功
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[root@localhost Python-2.7.5]
# python -V
Python 2.7.5
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解决默认 python 软链接指向 python2.7 版本后 yum 不能正常工作的问题
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[root@localhost Python-2.7.5]
# vi /usr/bin/yum
#!/usr/bin/python
...
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#!/usr/bin/python
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#!/usr/bin/python2.4
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============== 我是分割线 =============
当默认 python 升级到 2.7.5 后，在未修改 /usr/bin/yum 时，运行 yum 相关命令会得到如下错误：
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[root@localhost Python-2.7.5]
# yum list
There was a problem importing one of the Python modules
required to run yum. The error leading to this problem was:
No module named yum
Please
install
a package
which
provides this module, or
verify that the module is installed correctly.
It
's possible that the above module doesn'
t match the
current version of Python,
which
is:
2.7.5 (default, Jul 5 2013, 02:21:36)
[GCC 4.1.2 20080704 (Red Hat 4.1.2-54)]
If you cannot solve this problem yourself, please go to
the yum faq at:
http:
//wiki
.linux.duke.edu
/YumFaq
[root@localhost Python-2.7.5]
#
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[root@localhost Python-2.7.5]
# vi /usr/bin/yum
#!/usr/bin/python
import
sys
try:
import
yum
except ImportError:
print >> sys.stderr,
""
"\
There was a problem importing one of the Python modules
required to run yum. The error leading to this problem was:
%s
Please
install
a package
which
provides this module, or
verify that the module is installed correctly.
It
's possible that the above module doesn'
t match the
current version of Python,
which
is:
%s
If you cannot solve this problem yourself, please go to
the yum faq at:
http:
//wiki
.linux.duke.edu
/YumFaq
""
" % (sys.exc_value, sys.version)
sys.
exit
(1)
sys.path.insert(0,
'/usr/share/yum-cli'
)
try:
import
yummain
yummain.user_main(sys.argv[1:], exit_code=True)
except KeyboardInterrupt, e:
print >> sys.stderr,
"\n\nExiting on user cancel."
sys.
exit
(1)
~
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============== 我是分割线 2015-09-08 =============
上述变更方式，改动比较大，另外一种方式为，保留系统中已有 Python 相关内容不变，仅通过变更环境变量的方式引用新版本 Python 即可。
PS: 若出现错误 " ImportError: No module named bz2 " ，则需要先安装 bzip2-devel ，再重新编译 Python 即可（正统方法）；或者，执行
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cp
/usr/lib64/python2
.6
/lib-dynload/bz2
.so
/usr/local/lib/python2
.7/
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