Ubuntu 14.04 .5 LTS 安装Python-pip

今天有一个朋友说在Ubuntu虚拟机上安装python-pip很困难，我想想以后我也要python的爬虫或者别的，也一定要装pip，赶紧我也试试。

#sudo lsb_release -a
Distributor ID: Ubuntu
Description:    Ubuntu 14.04.5 LTS

说明了我现在ubuntu的版本，再来看一下pip有没有。

#pip -V
The program 'pip' is currently not installed. You can install it by typing:
sudo apt-get install python-pip

看来是没有需要安装。试着安装一下，看看是否成功。

#apt-get install python-pip
Reading package lists... Done
Building dependency tree       
Reading state information... Done
python-pip is already the newest version.
The following package was automatically installed and is no longer required:
  libqpdf13
Use 'apt-get autoremove' to remove it.
0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
#pip -V
pip 1.5.4 from /usr/lib/python2.7/dist-packages (python 2.7)

这个应该是有点问题，我的ubuntu上是有两个版本的Python，一个2.7，一个3.4。这个应该说明我安装的是适合python2.7版的。

#pip3 install --upgrade pip
pip is configured with locations that require TLS/SSL, however the ssl       module in Python is not available.
Could not fetch URL https://pypi.python.org/simple/pip/: There was a     problem confirming the ssl certificate: Can't connect to HTTPS URL     because the SSL module is not available. - skipping
Requirement already up-to-date: pip in /usr/local/lib/python3.6/site-packages

我到底安装了多少个版本的python呀?我到底干了些什么？

#python -V
显示： Python 2.7.6
python3 -V
显示：Python 3.6.0
#python3.4 -V
显示：Python 3.4.3

发现自己安装两个版本的python，一个3.4.3，一个3.6.0，自带一个2.7.6。这回算是明白点了。

#sd  /usr/local/bin
#ls 
to3              idle3.6  pydoc3.6          python3.6m         pyvenv-3.6
2to3-3.6          pip3     python3           python3.6m-config
easy_install-3.6  pip3.6   python3.6         python3-config
idle3             pydoc3   python3.6-config  pyvenv  
#pip3 -V
pip 9.0.1 from /usr/local/lib/python3.6/site-packages (python 3.6)
#pip3.6 -V
pip 9.0.1 from /usr/local/lib/python3.6/site-packages (python 3.6)

看来都是3.6这个版本的，有可能是我之前安装python3.6的时候就已经安装过了。

安装新的python包：

#pip install packageName

卸载python包：

#pip uninstall packageName

寻找python包：

#pip search packageName

看一下pip3.6是否安装好了？

#pip3.6 list
DEPRECATION: The default format will switch to columns in the future. You can use --format=(legacy|columns) (or define a format=(legacy|columns) in your pip.conf under the [list] section) to disable this warning.
pip (9.0.1)
setuptools (28.8.0)

不行，我困了，先写到这里吧，还没有验证pip3.6是否安装正确，是否能正常使用，等待下一期吧。

pip官方下载：https://pypi.org/project/pip/#files