【python】python2.7源码安装遇到的问题&&解决

1、Error_Info 1: INFO: Can't locate Tcl/Tk libs and/or headers

1.1 解决

yum install tcl-devel
yum install tk-devel

1.2 原因

参考：
You may have to install Tcl and Tk(when using RPM, install the –devel RPM as well) and /or edit the setup.py script to point to the right locations where Tcl/Tk is installed. If you install Tcl/Tk in the default locations, simply rerunning “make” should build the _tkinter extension.

2、Error_Info 2: Python build finished, but the necessary bits to build these modules were not found

错误信息如下示：
Python build finished, but the necessary bits to build these modules were not found:
_bsddb _tkinter bsddb185
dl imageop sunaudiodev

解决：
在CentOS下，可以安装这些依赖包：readline-devel，sqlite-devel，bzip2-devel.i686，openssl-devel.i686，gdbm-devel.i686，libdbi-devel.i686，ncurses-libs，zlib-devel.i686。完成这些安装之后，可以再次编译。

$ yum install readline-devel sqlite-devel bzip2-devel.i686 openssl-devel.i686 gdbm-devel.i686 libdbi-devel.i686 ncurses-libs，zlib-devel.i686
$ make && make install

此解决办法参考：Python编译安装遇到的问题

3、多版本共存解决：安装完python2.7之后，还是显示旧版（2.6）

问题如图：

解决：

# 把原来的python重命名成python_old，注意不要删除它
$ mv /usr/bin/python /usr/bin/python_old
# 建立新的python的软链接，/usr/local/python27为你刚才的安装目录
$ ln -s /usr/local/python27/bin/python /usr/bin/

4、yum错误：解决因python版本变化，引起的yum问题

问题如图：

解决：
修改yum脚本（因为yum脚本使用python解析的）

vim /usr/bin/yum
# 进入文件，修改首行#!/usr/bin/python 为旧版的python2.6（这个是我本机的）
#!/usr/bin/python2.6

参考：升级python到最新2.7.x -- linux
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