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    <p><code>python-shell</code> uses variable <code>python-default-interpreter</code> to determine which python interpreter to use. When the value of this variable is <code>cpython</code>, the variables <code>python-python-command</code> and <code>python-python-command-args</code> are consulted to determine the interpreter and arguments to use. Those two variables are manipulated by <code>virtualenv.el</code> to set the current virtual environment.</p> <p>So when you use <code>python-shell</code> command, it uses your virtual environments without any problem.</p> <p>But, when you do <kbd>M-!</kbd> <code>python</code>, you're not using the variables <code>python-python-command</code> and <code>python-python-command-args</code>. So it uses the python tools it finds in your path.</p> <p>When you call <kbd>M-x</kbd> <code>pdb</code> it uses gud-pdb-command-name as the default pdb tool. To redefine this variable, each time you activate an environment, you could do something like this :</p> <pre><code>(defadvice virtualenv-activate (after virtual-pdb) (custom-set-variables '(gud-pdb-command-name (concat virtualenv-active "/bin/pdb" )))) (ad-activate 'virtualenv-activate) </code></pre> <p>To have pdb in your virtual environment, do the following :</p> <pre><code>cp /usr/bin/pdb /path/to/virtual/env/bin </code></pre> <p>Then edit the first line of /path/to/virtual/env/bin/pdb to have :</p> <pre><code>#! /usr/bin/env python </code></pre> <p>Reactivate your env and Pdb should now use your virtualenv python instead of the system-wide python.</p>
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    1. POGetting pdb in Emacs to use Python process from current virtualenv
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    1. USJérôme Radix
    1. USJérôme Radix
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    1. POGetting pdb in Emacs to use Python process from current virtualenv
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    1. COThanks Jerome. For others trying to get this working note that I had to cp /usr/bin/pdb to <path-to-virtualenv>/bin and change the shebang to use the virtualenv python executable. This is because mkvirtualenv --no-site-packages <env-name> does not deposit the necessary pdb into the /bin directory of the newly created environment.
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      1. UScodeasone
    2. COThx for those details. You could also create a symbolic link to avoid copying of files.
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