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How to Install Pip on Ubuntu
======
**Pip is a command line tool that allows you to install software packages written in Python. Learn how to install Pip on Ubuntu and how to use it for installing Python applications.**
There are numerous ways to [install software on Ubuntu][1]. You can install applications from the software center, from downloaded DEB files, from PPA, from [Snap packages][2], [using Flatpak][3], using [AppImage][4] and even from the good old source code.
There is one more way to install packages in [Ubuntu][5]. It’s called Pip and you can use it to install Python-based applications.
### What is Pip
[Pip][6] stands for “Pip Installs Packages”. [Pip][7] is a command line based package management system. It is used to install and manage software written in [Python language][8].
You can use Pip to install packages listed in the Python Package Index ([PyPI][9]).
As a software developer, you can use pip to install various Python module and packages for your own Python projects.
As an end user, you may need pip in order to install some applications that are developed using Python and can be installed easily using pip. One such example is [Stress Terminal][10] application that you can easily install with pip.
Let’s see how you can install pip on Ubuntu and other Ubuntu-based distributions.
### How to install Pip on Ubuntu
![Install pip on Ubuntu Linux][11]
Pip is not installed on Ubuntu by default. You’ll have to install it. Installing pip on Ubuntu is really easy. I’ll show it to you in a moment.
Ubuntu 18.04 has both Python 2 and Python 3 installed by default. And hence, you should install pip for both Python versions.
Pip, by default, refers to the Python 2. Pip in Python 3 is referred by pip3.
Note: I am using Ubuntu 18.04 in this tutorial. But the instructions here should be valid for other versions like Ubuntu 16.04, 18.10 etc. You may also use the same commands on other Linux distributions based on Ubuntu such as Linux Mint, Linux Lite, Xubuntu, Kubuntu etc.
#### Install pip for Python 2
First, make sure that you have Python 2 installed. On Ubuntu, use the command below to verify.
```
python2 --version
```
If there is no error and a valid output that shows the Python version, you have Python 2 installed. So now you can install pip for Python 2 using this command:
```
sudo apt install python-pip
```
It will install pip and a number of other dependencies with it. Once installed, verify that you have pip installed correctly.
```
pip --version
```
It should show you a version number, something like this:
```
pip 9.0.1 from /usr/lib/python2.7/dist-packages (python 2.7)
```
This mans that you have successfully installed pip on Ubuntu.
#### Install pip for Python 3
You have to make sure that Python 3 is installed on Ubuntu. To check that, use this command:
```
python3 --version
```
If it shows you a number like Python 3.6.6, Python 3 is installed on your Linux system.
Now, you can install pip3 using the command below:
```
sudo apt install python3-pip
```
You should verify that pip3 has been installed correctly using this command:
```
pip3 --version
```
It should show you a number like this:
```
pip 9.0.1 from /usr/lib/python3/dist-packages (python 3.6)
```
It means that pip3 is successfully installed on your system.
### How to use Pip command
Now that you have installed pip, let’s quickly see some of the basic pip commands. These commands will help you use pip commands for searching, installing and removing Python packages.
To search packages from the Python Package Index, you can use the following pip command:
```
pip search <search_string>
```
For example, if you search or stress, it will show all the packages that have the string ‘stress’ in its name or description.
```
pip search stress
stress (1.0.0) - A trivial utility for consuming system resources.
s-tui (0.8.2) - Stress Terminal UI stress test and monitoring tool
stressypy (0.0.12) - A simple program for calling stress and/or stress-ng from python
fuzzing (0.3.2) - Tools for stress testing applications.
stressant (0.4.1) - Simple stress-test tool
stressberry (0.1.7) - Stress tests for the Raspberry Pi
mobbage (0.2) - A HTTP stress test and benchmark tool
stresser (0.2.1) - A large-scale stress testing framework.
cyanide (1.3.0) - Celery stress testing and integration test support.
pysle (1.5.7) - An interface to ISLEX, a pronunciation dictionary with stress markings.
ggf (0.3.2) - global geometric factors and corresponding stresses of the optical stretcher
pathod (0.17) - A pathological HTTP/S daemon for testing and stressing clients.
MatPy (1.0) - A toolbox for intelligent material design, and automatic yield stress determination
netblow (0.1.2) - Vendor agnostic network testing framework to stress network failures
russtress (0.1.3) - Package that helps you to put lexical stress in russian text
switchy (0.1.0a1) - A fast FreeSWITCH control library purpose-built on traffic theory and stress testing.
nx4_selenium_test (0.1) - Provides a Python class and apps which monitor and/or stress-test the NoMachine NX4 web interface
physical_dualism (1.0.0) - Python library that approximates the natural frequency from stress via physical dualism, and vice versa.
fsm_effective_stress (1.0.0) - Python library that uses the rheological-dynamical analogy (RDA) to compute damage and effective buckling stress in prismatic shell structures.
processpathway (0.3.11) - A nifty little toolkit to create stress-free, frustrationless image processing pathways from your webcam for computer vision experiments. Or observing your cat.
```
If you want to install an application using pip, you can use it in the following manner:
```
pip install <package_name>
```
Pip doesn’t support tab completion so the package name should be exact. It will download all the necessary files and installed that package.
If you want to remove a Python package installed via pip, you can use the remove option in pip.
```
pip uninstall <installed_package_name>
```
You can use pip3 instead of pip in the above commands.
I hope this quick tip helped you to install pip on Ubuntu. If you have any questions or suggestions, please let me know in the comment section below.
--------------------------------------------------------------------------------
via: https://itsfoss.com/install-pip-ubuntu/
作者：[Abhishek Prakash][a]
选题：[lujun9972](https://github.com/lujun9972)
译者：[译者ID](https://github.com/译者ID)
校对：[校对者ID](https://github.com/校对者ID)
本文由 [LCTT](https://github.com/LCTT/TranslateProject) 原创编译，[Linux中国](https://linux.cn/) 荣誉推出
[a]: https://itsfoss.com/author/abhishek/
[1]: https://itsfoss.com/how-to-add-remove-programs-in-ubuntu/
[2]: https://itsfoss.com/use-snap-packages-ubuntu-16-04/
[3]: https://itsfoss.com/flatpak-guide/
[4]: https://itsfoss.com/use-appimage-linux/
[5]: https://www.ubuntu.com/
[6]: https://en.wikipedia.org/wiki/Pip_(package_manager)
[7]: https://pypi.org/project/pip/
[8]: https://www.python.org/
[9]: https://pypi.org/
[10]: https://itsfoss.com/stress-terminal-ui/
[11]: https://4bds6hergc-flywheel.netdna-ssl.com/wp-content/uploads/2018/10/install-pip-ubuntu.png

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如何在Ubuntu上安装Pip
======
**Pip是一个命令行工具，允许你安装Python编写的软件包。 学习如何在Ubuntu上安装Pip以及如何使用它来安装Python应用程序。**
有许多方法可以[在Ubuntu上安装软件][1]。 你可以从软件中心安装应用程序，也可以从下载的DEB文件，PPA（LCTT译者注：PPA即Personal Package Archives，个人软件包集），[Snap软件包][2]，也可以使用[使用Flatpak][3]，使用[AppImage][4]，甚至从旧的源代码安装。
还有一种方法可以在[Ubuntu][5]中安装软件包。 它被称为Pip，你可以使用它来安装基于Python的应用程序。
### 什么是Pip
[Pip][6]代表“Pip Installs Packages”。 [Pip][7]是一个基于命令行的包管理系统。 用于安装和管理[Python语言][8]编写的软件。
你可以使用Pip来安装Python包索引（[PyPI][9]）中列出的包。
作为软件开发人员，你可以使用pip为你自己的Python项目安装各种Python模块和包。
作为最终用户，你可能需要使用pip来安装一些Python开发的并且可以使用pip轻松安装的应用程序。 一个这样的例子是[Stress Terminal][10]应用程序，你可以使用pip轻松安装。
让我们看看如何在Ubuntu和其他基于Ubuntu的发行版上安装pip。
### 如何在Ubuntu上安装Pip
![Install pip on Ubuntu Linux][11]
默认情况下，Pip未安装在Ubuntu上。 你必须安装它。 在Ubuntu上安装pip非常简单。 我马上展示给你。
Ubuntu 18.04默认安装了Python 2和Python 3。 因此，你应该为两个Python版本安装pip。
Pip，默认情况下是指Python 2。pip3代表Python 3中的Pip。
注意：我在本教程中使用的是Ubuntu 18.04。 但是这里的教程应该适用于其他版本，如Ubuntu 16.04,18.10等。你也可以在基于Ubuntu的其他Linux发行版上使用相同的命令，如Linux Mint，Linux Lite，Xubuntu，Kubuntu等。
#### 为Python 2安装pip
首先，确保已经安装了Python 2。 在Ubuntu上，可以使用以下命令进行验证。
```
python2 --version
```
如果没有错误并且显示了Python版本的有效输出，则说明安装了Python 2。 所以现在你可以使用这个命令为Python 2安装pip：
```
sudo apt install python-pip
```
它将使用它安装pip和许多其他的依赖项。 安装完成后，请确认你已正确安装了pip。
```
pip --version
```
它应该显示一个版本号，如下所示：
```
pip 9.0.1 from /usr/lib/python2.7/dist-packages (python 2.7)
```
这意味着你已经成功在Ubuntu上安装了pip。
#### 为Python 3安装pip
你必须确保在Ubuntu上安装了Python 3。 可以使用以下命令检查一下：
```
python3 --version
```
如果显示了像Python 3.6.6这样的数字，则说明Python 3在你的Linux系统上安装好了。
现在，你可以使用以下命令安装pip3：
```
sudo apt install python3-pip
```
你应该使用以下命令验证pip3是否已正确安装：
```
pip3 --version
```
它应该显示一个这样的数字：
```
pip 9.0.1 from /usr/lib/python3/dist-packages (python 3.6)
```
这意味着pip3已成功安装在你的系统上。
### 如何使用Pip命令
现在你已经安装了pip，让我们快速看一些基本的pip命令。 这些命令将帮助你使用pip命令来搜索，安装和删除Python包。
要从Python包索引PypI中搜索包，可以使用以下pip命令：
```
pip search <search_string>
```
例如，如果你搜索stress这个词，将会显示名称或描述中包含字符串'stress'的所有包。
```
pip search stress
stress (1.0.0) - A trivial utility for consuming system resources.
s-tui (0.8.2) - Stress Terminal UI stress test and monitoring tool
stressypy (0.0.12) - A simple program for calling stress and/or stress-ng from python
fuzzing (0.3.2) - Tools for stress testing applications.
stressant (0.4.1) - Simple stress-test tool
stressberry (0.1.7) - Stress tests for the Raspberry Pi
mobbage (0.2) - A HTTP stress test and benchmark tool
stresser (0.2.1) - A large-scale stress testing framework.
cyanide (1.3.0) - Celery stress testing and integration test support.
pysle (1.5.7) - An interface to ISLEX, a pronunciation dictionary with stress markings.
ggf (0.3.2) - global geometric factors and corresponding stresses of the optical stretcher
pathod (0.17) - A pathological HTTP/S daemon for testing and stressing clients.
MatPy (1.0) - A toolbox for intelligent material design, and automatic yield stress determination
netblow (0.1.2) - Vendor agnostic network testing framework to stress network failures
russtress (0.1.3) - Package that helps you to put lexical stress in russian text
switchy (0.1.0a1) - A fast FreeSWITCH control library purpose-built on traffic theory and stress testing.
nx4_selenium_test (0.1) - Provides a Python class and apps which monitor and/or stress-test the NoMachine NX4 web interface
physical_dualism (1.0.0) - Python library that approximates the natural frequency from stress via physical dualism, and vice versa.
fsm_effective_stress (1.0.0) - Python library that uses the rheological-dynamical analogy (RDA) to compute damage and effective buckling stress in prismatic shell structures.
processpathway (0.3.11) - A nifty little toolkit to create stress-free, frustrationless image processing pathways from your webcam for computer vision experiments. Or observing your cat.
```
如果要使用pip安装应用程序，可以按以下方式使用它：
```
pip install <package_name>
```
Pip不支持使用tab键补全包名，因此包名称应该是准确的。 它将下载所有必需的文件并安装该软件包。
如果要删除通过pip安装的Python包，可以使用pip中的remove选项。
```
pip uninstall <installed_package_name>
```
你可以在上面的命令中使用pip3代替pip。
我希望这个快速提示可以帮助你在Ubuntu上安装pip。 如果你有任何问题或建议，请在下面的评论部分告诉我。
--------------------------------------------------------------------------------
via: https://itsfoss.com/install-pip-ubuntu/
作者：[Abhishek Prakash][a]
选题：[lujun9972](https://github.com/lujun9972)
译者：[Flowsnow](https://github.com/Flowsnow)
校对：[校对者ID](https://github.com/校对者ID)
本文由 [LCTT](https://github.com/LCTT/TranslateProject) 原创编译，[Linux中国](https://linux.cn/) 荣誉推出
[a]: https://itsfoss.com/author/abhishek/
[1]: https://itsfoss.com/how-to-add-remove-programs-in-ubuntu/
[2]: https://itsfoss.com/use-snap-packages-ubuntu-16-04/
[3]: https://itsfoss.com/flatpak-guide/
[4]: https://itsfoss.com/use-appimage-linux/
[5]: https://www.ubuntu.com/
[6]: https://en.wikipedia.org/wiki/Pip_(package_manager)
[7]: https://pypi.org/project/pip/
[8]: https://www.python.org/
[9]: https://pypi.org/
[10]: https://itsfoss.com/stress-terminal-ui/
[11]: https://4bds6hergc-flywheel.netdna-ssl.com/wp-content/uploads/2018/10/install-pip-ubuntu.png