[python] How do I install the yaml package for Python?

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)

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

Update: Nowadays installing is done with pip, but libyaml is still required to build the C extension (on mac):

brew install libyaml
python -m pip install pyyaml

Outdated method:

For MacOSX (mavericks), the following seems to work:

brew install libyaml
sudo python -m easy_install pyyaml

Type in pip3 install yaml or like Connor pip3 install strictyaml

For me, installing development version of libyaml did it.

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

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

Debian-based systems:

$ sudo aptitude install python-yaml

or newer for python3

$ sudo aptitude install python3-yaml

Use 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.

pip install PyYAML

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

"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 https://github.com/yaml/pyyaml

Install the libYAML and it's headers:

sudo apt-get install libyaml-dev

Download the pyyaml sources:

wget http://pyyaml.org/download/pyyaml/PyYAML-3.13.tar.gz

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