106 lines
2.3 KiB
Markdown
106 lines
2.3 KiB
Markdown
# 如何在 Python 中使用 Pip
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> 原文：<https://www.pythonforbeginners.com/basics/python-pip-usage>
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Pip 是一个软件包管理系统，用于安装和管理软件包，例如那些在 [Python 包索引](https://pypi.python.org/pypi "PYPI")中找到的软件包。
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### 皮普是什么？
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```py
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Pip is a replacement for easy_install.
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Packages installs the packages default under site-packages.
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```
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### 安装 Pip
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```py
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To install Pip on your system, you can use either the source tarball or
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by using easy_install.
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>> $ easy_install pip
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After that, the pip application is installed.
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```
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### Pip 使用
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```py
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How to use Pip
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```
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##### 安装软件包
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```py
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$ pip install simplejson
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[... progress report ...]
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Successfully installed simplejson
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```
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##### 升级软件包
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```py
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$ pip install --upgrade simplejson
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[... progress report ...]
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Successfully installed simplejson
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```
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##### 移除包
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```py
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$ pip uninstall simplejson
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Uninstalling simplejson:
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/home/me/env/lib/python2.7/site-packages/simplejson
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/home/me/env/lib/python2.7/site-packages/simplejson-2.2.1-py2.7.egg-info
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Proceed (y/n)? y
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Successfully uninstalled simplejson
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```
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##### 搜索包
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```py
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#Search PyPI for packages
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$ pip search "query"
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```
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##### 检查包的状态
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```py
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# To get info about an installed package, including its location and files:
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pip show ProjectName
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```
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### 为什么使用 Pip 而不是 easy_install？
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```py
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(The answer is taken from this [post](https://stackoverflow.com/questions/3220404/why-use-pip-over-easy-install "pip-over-easy_install") on stackoverflow)
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All packages are downloaded before installation.
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Partially-completed installation doesn’t occur as a result.
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Care is taken to present useful output on the console.
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The reasons for actions are kept track of.
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For instance, if a package is being installed, pip keeps track of why that
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package was required.
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Error messages should be useful.
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The code is relatively concise and cohesive, making it easier to use
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programmatically.
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Packages don’t have to be installed as egg archives, they can be installed flat.
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Native support for other version control systems (Git, Mercurial and Bazaar)
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Uninstallation of packages.
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Simple to define fixed sets of requirements and reliably reproduce a set of
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packages.
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``` |