ubuntu18.04安装pip,ubuntu安装pip不成功

原文地址为：https://blog.csdn.net/humanking7/article/details/84392790

环境配置环境： ubuntu 16.04针对环境：python2.7.12** 1、安装pip apt-get install python-pip# 当然可以把其他东西也一起安装上apt-get install python-pip python-dev build-essential 2. 查看pip版本 #大写的V，或者--version pip -V # 输出：# pip 8.1.1 from /usr/lib/python2.7/dist-packages (python 2.7) 3. 更新pip 3.1. 正常更新 pip install --upgrade pip#或者pip install -U pip

但是有可能升级不了，显示：

root@qfx-HP-xw4600-Workstation:~# pip install -U pipCollecting pip Using cached https://files.pythonhosted.org/packages/c2/d7/90f34cb0d83a6c5631cf71dfe64cc1054598c843a92b400e55675cc2ac37/pip-18.1-py2.py3-none-any.whlInstalling collected packages: pip Found existing installation: pip 8.1.1 Not uninstalling pip at /usr/lib/python2.7/dist-packages, outside environment /usrSuccessfully installed pip-8.1.1You are using pip version 8.1.1, however version 18.1 is available.You should consider upgrading via the 'pip install --upgrade pip' command. 3.2. 更新不了，通过源码安装更新

各种方法都试过，比如使用命令：python -m pip install --upgrade pip进行安装，但是还是会出现上面的提示，所以就用源码进行升级。

3.2.1 下载源码下载源码，也可以去pip官网下载 https://pypi.org/project/pip/#fileswget https://files.pythonhosted.org/packages/45/ae/8a0ad77defb7cc903f09e551d88b443304a9bd6e6f124e75c0fbbf6de8f7/pip-18.1.tar.gz# ==========# 详细安装信息root@qfx-HP-xw4600-Workstation:~# mkdir pipDirroot@qfx-HP-xw4600-Workstation:~# cd pipDir/root@qfx-HP-xw4600-Workstation:~/pipDir# wget https://files.pythonhosted.org/packages/45/ae/8a0ad77defb7cc903f09e551d88b443304a9bd6e6f124e75c0fbbf6de8f7/pip-18.1.tar.gz--2018-11-23 13:56:53-- https://files.pythonhosted.org/packages/45/ae/8a0ad77defb7cc903f09e551d88b443304a9bd6e6f124e75c0fbbf6de8f7/pip-18.1.tar.gz正在解析主机 files.pythonhosted.org (files.pythonhosted.org)... 2a04:4e42:1a::319, 151.101.109.63正在连接 files.pythonhosted.org (files.pythonhosted.org)|2a04:4e42:1a::319|:443... 已连接。已发出 HTTP 请求，正在等待回应... 200 OK长度： 1259370 (1.2M) [糟糕的云朵ary/octet-stream]正在保存至: “pip-18.1.tar.gz”pip-18.1.tar.gz 100%[====================================>] 1.20M 9.92KB/s in 2m 35s 2018-11-23 13:59:31 (7.94 KB/s) - 已保存 “pip-18.1.tar.gz” [1259370/1259370])root@qfx-HP-xw4600-Workstation:~/pipDir# lspip-18.1.tar.gz 3.2.2 解压安装

解压安装

# 解压root@qfx-HP-xw4600-Workstation:~/pipDir# tar xzvf pip-18.1.tar.gz # 查看解压后的目录root@qfx-HP-xw4600-Workstation:~/pipDir# lspip-18.1 pip-18.1.tar.gz# 进入目录查看里面的文件root@qfx-HP-xw4600-Workstation:~/pipDir# cd pip-18.1/root@qfx-HP-xw4600-Workstation:~/pipDir/pip-18.1# ls -1AUTHORS.txtdocsLICENSE.txtMANIFEST.inNEWS.rstPKG-INFOpyproject.tomlREADME.rstsetup.cfgsetup.pysrc# 安装piproot@qfx-HP-xw4600-Workstation:~/pipDir/pip-18.1# python setup.py install......Installed /usr/local/lib/python2.7/dist-packages/pip-18.1-py2.7.eggProcessing dependencies for pip==18.1Finished processing dependencies for pip==18.1# 这表示安装成功 3.2.3 更新到了最新版本，却出现错误ImportError: cannot import name main

使用pip -V检测一下版本，发现出现错误：

root@qfx-HP-xw4600-Workstation:~/pipDir/pip-18.1# pip -VTraceback (most recent call last): File "/usr/糟糕的云朵/pip", line 9, in <module> from pip import mainImportError: cannot import name main

出现问题的原因：
说是一个bug，导致只要用pip，就会抛出一个异常，但是要解决起来也比较容易。

首先定位问题：
问题出现在了/usr/糟糕的云朵/中的pip文件，用vim打开，进行编辑：

原来的代码：

#!/usr/糟糕的云朵/python# GENERATED BY DEBIANimport sys # Run the main entry point, similarly to how setuptools does it, but because# we didn't install the actual entry point from setup.py, don't use the# pkg_resources API.from pip import mainif __name__ == '__main__': sys.exit(main())

修改后的代码：

保存后，去检测一下现在pip的版本：

root@qfx-HP-xw4600-Workstation:~/pipDir/pip-18.1# pip -Vpip 18.1 from /usr/local/lib/python2.7/dist-packages/pip-18.1-py2.7.egg/pip (python 2.7)

ok，已经成功更新到 pip 18.1 了。

4. 卸载pip apt-get remove python-pip 5. pip常用命令查看pip帮助：pip -help安装新的python包：pip install packageName卸载python包：pip uninstall packageName寻找python包：pip search packageName查看python2的pip安装包：pip list查看python3的pip安装包：pip3 list