Managing packages

NOTE: There are many options available for the commands described on this page. For details, see Command reference.

Searching for packages

Use the Terminal or an Anaconda Prompt for the following steps.

To see if a specific package such as SciPy is available for installation:

conda search scipy

To see if a specific package such as SciPy is available for installation from Anaconda.org:

conda search --override-channels --channel defaults scipy

To see if a specific package, such as iminuit, exists in a specific channel, such as http://conda.anaconda.org/mutirri, and is available for installation:

conda search --override-channels --channel http://conda.anaconda.org/mutirri iminuit

Installing packages

Use the Terminal or an Anaconda Prompt for the following steps.

To install a specific package such as SciPy into an existing environment “myenv”:

conda install --name myenv scipy

If you do not specify the environment name, which in this example is done by --name myenv, the package installs into the current environment:

conda install scipy

To install a specific version of a package such as SciPy:

conda install scipy=0.15.0

To install multiple packages at once, such as SciPy and cURL:

conda install scipy curl

NOTE: It is best to install all packages at once, so that all of the dependencies are installed at the same time.

To install multiple packages at once and specify the version of the package:

conda install scipy=0.15.0 curl=7.26.0

To install a package for a specific Python version:

conda install scipy=0.15.0 curl=7.26.0 -n py34_env

If you want to use a specific Python version, it is best to use an environment with that version. For more information, see Troubleshooting.

Installing packages from Anaconda.org

Packages that are not available using conda install can be obtained from Anaconda.org. Formerly Binstar.org, Anaconda.org, is a package management service for both public and private package repositories. Anaconda.org is an Anaconda product, just like Anaconda and Miniconda.

To install a package from Anaconda.org:

  1. In a browser, go to http://anaconda.org.

  2. To find the package named bottleneck, type bottleneck in the top-left box named Search Packages.

  3. Find the package that you want and click it to go to the detail page.

    The detail page displays the name of the channel. In this example it is the “pandas” channel.

  4. Now that you know the channel name, use the conda install command to install the package. In your Terminal window or an Anaconda Prompt, run:

    conda install -c pandas bottleneck
    

    This command tells conda to install the bottleneck package from the pandas channel on Anaconda.org.

  5. To check that the package is installed, in your Terminal window or an Anaconda Prompt, run:

    conda list
    

    A list of packages appears, including bottleneck.

NOTE: For information on installing packages from multiple channels, see Managing channels.

Installing non-conda packages

If a package is not available from conda or Anaconda.org, you may be able to find and install the package with another package manager like pip.

Pip packages do not have all the features of conda packages, and we recommend first trying to install any package with conda. If the package is unavailable through conda, try installing it with pip. The differences between pip and conda packages cause certain unavoidable limits in compatibility, but conda works hard to be as compatible with pip as possible.

NOTE: Both pip and conda are included in Anaconda and Miniconda, so you do not need to install them separately.

NOTE: Conda environments replace virtualenv, so there is no need to activate a virtualenv before using pip.

To install a non-conda package:

  1. Activate the environment where you want to put the program:

    • On Windows, in your Anaconda Prompt, run activate myenv.
    • On macOS and Linux,in your Terminal window, run source activate myenv.
  2. To use pip to install a program such as See, in your Terminal window or an Anaconda Prompt, run:

    pip install see
    
  3. To verify the package was installed, in your Terminal window or an Anaconda Prompt, run:

    conda list
    

Installing commercial packages

Installing a commercial package such as IOPro is the same as installing any other package. In your Terminal window or an Anaconda Prompt, run:

conda install --name myenv iopro

This command installs a free trial of one of Anaconda’s commercial packages called IOPro, which can speed up your Python processing. Except for academic use, this free trial expires after 30 days.

Viewing a list of installed packages

Use the Terminal or an Anaconda Prompt for the following steps.

To list all of the packages in the active environment:

conda list

To list all of the packages in a deactivated environment:

conda list -n myenv

Updating packages

Use conda update command to check to see if a new update is available. If conda tells you an update is available, you can then choose whether or not to install it.

Use the Terminal or an Anaconda Prompt for the following steps.

To update a specific package:

conda update biopython

To update Python:

conda update python

To update conda itself:

conda update conda

NOTE: Conda updates to the highest version in its series, so Python 2.7 updates to the highest available in the 2.x series and 3.6 updates to the highest available in the 3.x series.

To update the Anaconda metapackage:

conda update conda
conda update anaconda

Regardless of what package you are updating, conda compares versions and then reports what is available to install. If no updates are available, conda reports “All requested packages are already installed.”

If a newer version of your package is available and you wish to update it, type y to update:

Proceed ([y]/n)? y

Preventing packages from updating (pinning)

Pinning a package specification in an environment prevents packages listed in the pinned file from being updated.

In the environment’s conda-meta directory, add a file named pinned that includes a list of the packages that you do not want updated.

EXAMPLE: The file below forces NumPy to stay on the 1.7 series, which is any version that starts with 1.7, and forces SciPy to stay at exactly version 0.14.2:

numpy 1.7.*
scipy ==0.14.2

With this pinned file, conda update numpy keeps NumPy at 1.7.1, and conda install scipy=0.15.0 causes an error.

Use the --no-pin flag to override the update restriction on a package. In the Terminal or an Anaconda Prompt, run:

conda update numpy --no-pin

Because the pinned specs are included with each conda install, subsequent conda update commands without --no-pin will revert NumPy back to the 1.7 series.

Removing packages

Use the Terminal or an Anaconda Prompt for the following steps.

To remove a package such as SciPy in an environment such as myenv:

conda remove -n myenv scipy

To remove a package such as SciPy in the current environment:

conda remove scipy

To remove multiple packages at once, such as SciPy and cURL:

conda remove scipy curl

To confirm that a package has been removed:

conda list