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)
pip install pyyaml
imports as import yaml
inside your actual script.
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including PyYaml, yamltools, and PySyck, among others (Note that PySyck docs recommend using PyYaml, since syck is out of date).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Outdated method: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.
libyaml is not found or a compiler error: forcing --without-libyaml
when using sudo pip install PyYAML
. What should I do? Thanks.
Successfully installed PyYAML
. See pip-PyYAML for complete information. Thanks again.
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 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
brew install libyaml & pip install pyyaml
but, python -c 'from yaml import CSafeLoader'
kept failing
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
Success story sharing
PyYAML
notpython-yaml
.yaml
in PyPI; today there are >4500; >750 matches for "pyyaml". In the comments to how does pip search work, we find that pip only returns the first 100 results, due to the PyPI api. But that is an explanation for the problem, not a method to solve the issue of selecting an appropriate package sadly. Would be v happy for suggestions of what to incorporate in the answer