#安装python2.7版本
tar xvf Python-2.7.9.tar.xz
cd Python-2.7.9
./configure --prefix=/usr/bin/python2.7
make
make install
mv /usr/bin/python /usr/bin/python.bak
ln -s /usr/bin/python2.7/bin/python2.7 /usr/bin/python问题1：yum安装报错
No module named yum解决：
前面安装了python2.7，默认2.6。python 版本更改后，
/usr/bin/yum 文件需要更新 首行改为 #!/usr/bin/python2.6
问题2：pip command not found
[root@ Python-2.7.9]# pip install jinja2
-bash: pip: command not found解决
[root@ ~]# yum -y install python-setuptools
[root@ ~]# easy_install pip问题3：ImportError: No module named pkg_resources
[root@ ~]# easy_install pip
Traceback (most recent call last):
File "/usr/bin/easy_install", line 5, in
from pkg_resources import load_entry_point
ImportError: No module named pkg_resources 解决：
[root@ ~]# curl https://bootstrap.pypa.io/ez_setup.py | python
问题4：easy_install pip 报错 The ‘distribute==0.6.10‘ distribution was not found
[root@ ~]# easy_install pip
Traceback (most recent call last):
File "/usr/bin/easy_install", line 5, in
from pkg_resources import load_entry_point
File "build/bdist.linux-x86_64/egg/pkg_resources/__init__.py", line 3019, in
File "build/bdist.linux-x86_64/egg/pkg_resources/__init__.py", line 3003, in _call_aside
File "build/bdist.linux-x86_64/egg/pkg_resources/__init__.py", line 3032, in _initialize_master_working_set
File "build/bdist.linux-x86_64/egg/pkg_resources/__init__.py", line 655, in _build_master
File "build/bdist.linux-x86_64/egg/pkg_resources/__init__.py", line 963, in require
File "build/bdist.linux-x86_64/egg/pkg_resources/__init__.py", line 849, in resolve
pkg_resources.DistributionNotFound: The ‘distribute==0.6.10‘ distribution was not found and is required by the application 解决：安装distribute
wget http://pypi.python.org/packages/source/d/distribute/distribute-0.6.10.tar.gz --no-check-certificate
tar zxvf distribute-0.6.10.tar.gz
cd distribute-0.6.10
python setup.py install
[root@ ~]# easy_install pip 成功
wKiom1mhiBnQpyAOAAEBSCmCOfA625.png问题5：上图显示安装pip成功，但执行命令依然显示 command not found
[root@ ~]# pip install jinja2
-bash: pip: command not found
排查：
[root@ ~]# which pip
[root@~]# ls /usr/bin/pip
ls: 无法访问/usr/bin/pip: 没有那个文件或目录解决：创建软连接：
[root@localhost ~]# ln -s /usr/bin/python2.7/bin/pip /usr/bin/pip安装成功
[root@~]# pip install jinja2
Collecting jinja2
Downloading Jinja2-2.9.6-py2.py3-none-any.whl (340kB)
100% |████████████████████████████████| 348kB 28kB/s
Collecting MarkupSafe>=0.23 (from jinja2)
Downloading MarkupSafe-1.0.tar.gz
Installing collected packages: MarkupSafe, jinja2
Running setup.py install for MarkupSafe ... done
Successfully installed MarkupSafe-1.0 jinja2-2.9.6问题6：pip认证失败，报错“There was a problem confirming the ssl certificate: [SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed”
[root@localhost Python-2.7.13]# pip install xlsxwriter
Collecting xlsxwriter
Could not fetch URL https://pypi.python.org/simple/xlsxwriter/: There was a problem confirming the ssl certificate: [SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed (_ssl.c:661) - skipping
Could not find a version that satisfies the requirement xlsxwriter (from versions: )
No matching distribution found for xlsxwriter
You are using pip version 9.0.1, however version 9.0.3 is available.
You should consider upgrading via the 'pip install --upgrade pip' command.解决：写一个pip配置文件~/.pip/pip.conf，在配置文件中加入trusted-host=pypi.python.org
[global]
timeout = 6000
#index-url = http://e.pypi.python.org/simple
index-url = https://pypi.python.org/simple/
[install]
use-mirrors = true
#mirrors = http://e.pypi.python.org
mirrors = https://pypi.python.org
trusted-host=pypi.python.org