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PO
 

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    <p>I ran into the exact same problem on Ubuntu 12.04, because I installed matplotlib (within a virtualenv) using</p> <pre><code>pip install matplotlib </code></pre> <p>To make long story short, my advice is: don't try to install matplotlib using pip or by hand; let a real package manager (e.g. apt-get / synaptic) install it and all its dependencies for you.</p> <p>Unfortunately, matplotlib's backends (alternative methods for actually rendering your plots) have all sorts of dependencies that pip will not deal with. Even worse, it fails silently; that is, <code>pip install matplotlib</code> appears to install matplotlib successfully. But when you try to use it (e.g. <code>pyplot.show()</code>), no plot window will appear. I tried all the different backends that people on the web suggest (Qt4Agg, GTK, etc.), and they all failed (i.e. when I tried to import matplotlib.pyplot, I get <code>ImportError</code> because it's trying to import some dependency that's missing). I then researched how to install those dependencies, but it just made me want to give up using pip (within virtualenv) as a viable installation solution for any package that has non-Python package dependencies. </p> <p>The whole experience sent me crawling back to apt-get / synaptic (i.e. the Ubuntu package manager) to install software like matplotlib. That worked perfectly. Of course, that means you can only install into your system directories, no virtualenv goodness, and you are stuck with the versions that Ubuntu distributes, which may be way behind the current version...</p>
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    1. POmatplotlib does not show my drawings although I call pyplot.show()
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    1. USChristopher Lee
    1. USChristopher Lee
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    1. COYour answer is a BIT long, you might consider shortening for the OP.
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      1. UStheJollySin
    2. COHave you tried the [`--system-site-packages`](http://www.virtualenv.org/en/latest/#the-system-site-packages-option) option?
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      1. USTianyang Li
    3. CO%Christopher Lee The problem with figures not showing without any error/other complaint is because the default backend when you `pip install` is `agg`. I'm not sure why, but you can change it as per the unutbu's answer. `pip` has the major advantage of installing an up-to-date version - `apt` installs an outdated version. Sometimes there are bug fixes/new features that you want/need.
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