如何在ubuntu12.04上将python升级到2.7.10

Question

默认的python版本是2.7.3，我安装python2.7.10，如下所示：

    wget https://www.python.org/ftp/python/2.7.10/Python-2.7.10.tgz
    tar xzf Python-2.7.10.tgz
    $ cd Python-2.7.10
    $ sudo ./configure 
    $ sudo make 
    $ sudo make install

然后，python升级到2.7.10

    root@ubuntu:/# python
    Python 2.7.10 (default, Aug 29 2017, 10:24:22) 
    [GCC 4.6.3] on linux2
    Type "help", "copyright", "credits" or "license" for more information.
    >>>

并安装请求库：

    root@ubuntu:/# pip install requests
    Requirement already satisfied (use --upgrade to upgrade): requests in /usr/local/lib/python2.7/dist-packages
    Requirement already satisfied (use --upgrade to upgrade): chardet>=3.0.2,=2.5,=1.21.1,=2017.4.17 in /usr/local/lib/python2.7/dist-packages (from requests)
    Cleaning up...
    root@ubuntu:/# 

但它没有名为request

的模块

    >>> import requests
    Traceback (most recent call last):
      File "", line 1, in 
    ImportError: No module named requests
    >>> 

但我怎样才能解决问题？请...