Installing with conda

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To install conda packages, in the terminal or an Anaconda Prompt, run:

conda install [packagename]

During the install process, files are extracted into the specified environment, defaulting to the current environment if none is specified. Installing the files of a conda package into an environment can be thought of as changing the directory to an environment, and then downloading and extracting the artifact and its dependencies---all with the single conda install [packagename] command.

Read more about conda environments and directory structure.

  • When you conda install a package that exists in a channel and has no dependencies, conda:

    • Looks at your configured channels (in priority).

    • Reaches out to the repodata associated with your channels/platform.

    • Parses repodata to search for the package.

    • Once the package is found, conda pulls it down and installs.

Conda update versus conda install

conda update is used to update to the latest compatible version. conda install can be used to install any version.

Example:

  • If Python 2.7.0 is currently installed, and the latest version of Python 2 is 2.7.5, then conda update python installs Python 2.7.5. It does not install Python 3.5.2.

  • If Python 3.4.0 is currently installed, and the latest version of Python is 3.5.2, then conda install python=3 installs Python 3.5.2.

Conda uses the same rules for other packages. conda update always installs the highest version with the same major version number, whereas conda install always installs the highest version.

Installing conda packages offline

To install conda packages offline, run: conda install /path-to-package/package-filename.tar.bz2/

If you prefer, you can create a /tar/ archive file containing many conda packages and install them all with one command: conda install /packages-path/packages-filename.tar

Note

If an installed package does not work, it may be missing dependencies that need to be resolved manually.

Installing packages directly from the file does not resolve dependencies.

Installing conda packages with a specific build number

If you want to install conda packages with the correct package specification, try pkg_name=version=build_string. Read more about build strings and package naming conventions. Learn more about package specifications and metadata.

For example, if you want to install llvmlite 0.31.0dev0 on Python 3.7.8, you would enter:

conda install  -c numba/label/dev llvmlite=0.31.0dev0=py37_8