I have a Python program that uses YAML. I attempted to install it on a new server using pip install yaml and it returns the following:

$ sudo pip install yaml Downloading/unpacking yaml Could not find any downloads that satisfy the requirement yaml No distributions at all found for yaml Storing complete log in /home/pa/.pip/pip.log 

How do I install the yaml package for Python? I'm running Python 2.7. (OS: Debian Wheezy)

11 Answers

You could try the search feature in pip,

$ pip search yaml 

which looks for packages in PyPI with yaml in the short description. That reveals various packages, including PyYaml, yamltools, and PySyck, among others (Note that PySyck docs recommend using PyYaml, since syck is out of date). Now you know a specific package name, you can install it:

$ pip install pyyaml 

If you want to install python yaml system-wide in linux, you can also use a package manager, like aptitude or yum:

$ sudo apt-get install python-yaml $ sudo yum install python-yaml 

pip install pyyaml

If you don't have pip, run easy_install pip to install pip, which is the go-to package installer - Why use pip over easy_install?. If you prefer to stick with easy_install, then easy_install pyyaml

This answers if for MacOS

Update: Nowadays installing is done with pip, and for many users a wheel may be available (depending on your Mac and required version of PyYaml). In some cases libyaml is still required to build the C extension (on mac); this can be done with:

brew install libyaml python -m pip install pyyaml 

Outdated method:

For MacOSX (mavericks), the following works:

brew install libyaml sudo python -m easy_install pyyaml 

pip install PyYAML 

If libyaml is not found or compiled PyYAML can do without it on Mavericks.

There are three YAML capable packages. Syck (pip install syck) which implements the YAML 1.0 specification from 2002; PyYAML (pip install pyyaml) which follows the YAML 1.1 specification from 2004; and ruamel.yaml which follows the latest (YAML 1.2, from 2009) specification.

You can install the YAML 1.2 compatible package with pip install ruamel.yaml or if you are running a modern version of Debian/Ubuntu (or derivative) with:

sudo apt-get install python-ruamel.yaml 

following command will download pyyaml, which also includes yaml

pip install pyYaml 

Debian-based systems:

$ sudo aptitude install python-yaml

or newer for python3

$ sudo aptitude install python3-yaml

"There should be one -- and preferably only one -- obvious way to do it." So let me add another one. This one is more like "install from sources" for Debian/Ubuntu, from

Install the libYAML and it's headers:

sudo apt-get install libyaml-dev 

Download the pyyaml sources:

wget 

Install from sources, (don't forget to activate your venv):

. your/env/bin/activate tar xzf PyYAML-3.13.tar.gz cd PyYAML-3.13.tar.gz (env)$ python setup.py install (env)$ python setup.py test 

Consider using strictyaml instead

If you have the luxury of creating the yaml file yourself, or if you don't require any of these features of regular yaml, I recommend using strictyaml instead of the standard pyyaml package.

In short, default yaml has some serious flaws in terms of security, interface, and predictability. strictyaml is a subset of the yaml spec that does not have those issues (and is better documented).

You can read more about the problems with regular yaml here

OPINION: strictyaml should be the default implementation of yaml and the old yaml spec should be obsoleted.

For me, installing development version of libyaml did it.

yum install libyaml-devel #centos apt-get install libyaml-dev # ubuntu 

Type in pip3 install yaml or like Connor pip3 install strictyaml