René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"plot label will not show up on legend if _ is used as first charcter in label","articleBody":"If the ASCII character 95 `_`  is used in as first character in a plot label, the label will not show up in the legend.\n\nIf only labels with `_` in front are used, the following warning is given:\n\n``` bash\n/opt/pkg/devel/python/3.4.3/lib/python3.4/site-packages/matplotlib-1.4.3-py3.4-linux-x86_64.egg/matplotlib/axes/_axes.py:475: UserWarning: No labelled objects found. Use label='...' kwarg on individual plots.\n  warnings.warn(\"No labelled objects found. \"\n```\n\nIn order to test this bug, I tried a variety of **matplotlib versions** on _Ubuntu_ and _OS X_.\n- 0.99.1.1\n- 1.1.0\n- 1.3.1\n- 1.4.3\n\n**All** have the above behavior. \n\nIn order to reproduce the bug, I used the following minimal example:\n\n``` python\nimport numpy as np\nimport matplotlib\nimport matplotlib.pyplot as plt\n\nprint(matplotlib.__version__)\n\nx = np.linspace(-10, 10, 1024)\ny = np.sin(x)\n\nplt.plot(x,y, label=\"_abc\")\n\nplt.legend()\nplt.show()\n```\n\nUsing `r\"_abc\"` instead does not solve the problem.\n","author":{"url":"https://github.com/PrometheusPi","@type":"Person","name":"PrometheusPi"},"datePublished":"2015-10-06T08:50:18.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":4},"url":"https://github.com/5200/matplotlib/issues/5200"}