René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"Invalid DISPLAY variable","articleBody":"In my AWS Ubuntu 14.02 instance I installed the matplotlib dependencies and then via pip I installed matplotlib:\n\nsudo apt-get build-dep python-matplotlib\n\nsudo pip install matplotlib\n\nsudo pip freeze:\nmatplotlib==1.4.0\n\nin a brand new file plotting1.py I wrote:\n# !/usr/bin/python\n\nfrom pylab import *\nplot([1,2,3])\nshow()\n\nafter typying chmod +x plotting1.py, I executed the little script:\n\ntime python plotting1.py\nTraceback (most recent call last):\nFile \"plotting1.py\", line 4, in\nplot([1,2,3])\nFile \"/usr/local/lib/python2.7/dist-packages/matplotlib/pyplot.py\", line 3086, in plot\nax = gca()\nFile \"/usr/local/lib/python2.7/dist-packages/matplotlib/pyplot.py\", line 827, in gca\nax = gcf().gca(*_kwargs)\nFile \"/usr/local/lib/python2.7/dist-packages/matplotlib/pyplot.py\", line 461, in gcf\nreturn figure()\nFile \"/usr/local/lib/python2.7/dist-packages/matplotlib/pyplot.py\", line 434, in figure\n*_kwargs)\nFile \"/usr/local/lib/python2.7/dist-packages/matplotlib/backends/backend_qt4ag g.py\", line 47, in new_figure_manager\nreturn new_figure_manager_given_figure(num, thisFig)\nFile \"/usr/local/lib/python2.7/dist-packages/matplotlib/backends/backend_qt4ag g.py\", line 54, in new_figure_manager_given_figure\ncanvas = FigureCanvasQTAgg(figure)\nFile \"/usr/local/lib/python2.7/dist-packages/matplotlib/backends/backend_qt4ag g.py\", line 72, in init\nFigureCanvasQT.init(self, figure)\nFile \"/usr/local/lib/python2.7/dist-packages/matplotlib/backends/backend_qt4.p y\", line 68, in init\n_create_qApp()\nFile \"/usr/local/lib/python2.7/dist-packages/matplotlib/backends/backend_qt5.p y\", line 139, in _create_qApp\nraise RuntimeError('Invalid DISPLAY variable')\nRuntimeError: Invalid DISPLAY variable\n\nreal 0m0.404s\nuser 0m0.284s\n\nWhat do I have to do now?\n\nLooking forward to your kind help.\nKind regards.\nMarco\n","author":{"url":"https://github.com/marcoippolito","@type":"Person","name":"marcoippolito"},"datePublished":"2014-09-04T05:59:18.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":23},"url":"https://github.com/3466/matplotlib/issues/3466"}