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PONew to writing fabric file to install packages
 

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    <pre><code>from fabric.api import sudo, put, run def install(): run('source /home/user/.virtualenvs/demo/bin/activate') run('pip install requests') if __name__ == '__main__': install() # to run this, do fab fabfile </code></pre> <p>Q1. I want to install pip in that environment. But after the script ran, requests is not install in the virtualenv. Why?</p> <p>Q2. I am asked to provide host information (the following is also the log for Q1). If my goal is to run on local, is there a better way to handle this? </p> <pre><code>No hosts found. Please specify (single) host string for connection: localhost [localhost] run: source /home/user/.virtualenvs/demo/bin/activate [localhost] Passphrase for private key: [localhost] Login password: [localhost] run: pip install requests [localhost] out: Requirement already satisfied (use --upgrade to upgrade): requests in /usr/local/lib/python2.7/dist-packages [localhost] out: Requirement already satisfied (use --upgrade to upgrade): certifi&gt;=0.0.7 in /usr/local/lib/python2.7/dist-packages (from requests) [localhost] out: Requirement already satisfied (use --upgrade to upgrade): oauthlib&gt;=0.1.0,&lt;0.2.0 in /usr/local/lib/python2.7/dist-packages (from requests) [localhost] out: Requirement already satisfied (use --upgrade to upgrade): chardet&gt;=1.0.0 in /usr/lib/python2.7/dist-packages (from requests) [localhost] out: Requirement already satisfied (use --upgrade to upgrade): rsa in /usr/local/lib/python2.7/dist-packages (from oauthlib&gt;=0.1.0,&lt;0.2.0-&gt;requests) [localhost] out: Requirement already satisfied (use --upgrade to upgrade): pyasn1&gt;=0.0.13 in /usr/local/lib/python2.7/dist-packages (from rsa-&gt;oauthlib&gt;=0.1.0,&lt;0.2.0-&gt;requests) [localhost] out: Cleaning up... [localhost] out: </code></pre> <hr> <p><strong>Update</strong></p> <p>I can install the packages in a single <code>run</code> command. Is there a better way to do that?</p> <p>Thanks.</p> <hr> <p>Here is the update code:</p> <pre><code>from fabric.api import sudo, put, run from fabric.context_managers import prefix def install(): with prefix('source /home/user/.virtualenvs/demo/bin/activate'): run('pip install requests') if __name__ == '__main__': install() </code></pre> <p><a href="http://docs.fabfile.org/en/1.2.0/api/core/context_managers.html?highlight=prefix#fabric.context_managers.prefix" rel="nofollow">http://docs.fabfile.org/en/1.2.0/api/core/context_managers.html?highlight=prefix#fabric.context_managers.prefix</a></p>
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