René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"Twinned axes do not allow setting of different formatters","articleBody":"To help us understand and resolve your issue please check that you have provided\r\nthe information below.\r\n\r\n- [x] Matplotlib version, Python version and Platform (Windows, OSX, Linux ...)\r\nMatplotlib 1.51, Python 3.5.2 on Red Hat Enterprise Linux 6.5\r\n\r\n- [x] How did you install Matplotlib and Python (pip, anaconda, from source ...)\r\nAnaconda 1.5.1 (conda 4.2.9)\r\n\r\n- [x] If possible please supply a [Short, Self Contained, Correct, Example](http://sscce.org/)\r\n      that demonstrates the issue i.e a small piece of code which reproduces the issue\r\n      and can be run with out any other (or as few as possible) external dependencies.\r\n```python\r\nfrom matplotlib import pyplot as plt\r\nfrom matplotlib.ticker import Formatter, MaxNLocator\r\n\r\nax = plt.plot([0, 1, 2, 3], [0, 1, 2, 3])[0].axes\r\nax.figure.subplots_adjust(bottom=0.3)\r\nax.set_xlabel('Axis1')  # To demonstrate that labels can be set differently\r\nax2 = ax.twinx()\r\nax2.set_frame_on(True)\r\nax2.patch.set_visible(False)\r\nax2.yaxis.set_visible(False)\r\nax2.xaxis.set_visible(True)\r\nax2.spines['bottom'].set_position(('axes', -0.2))  # So far so good\r\nax2.set_xlabel('Axis2')  # Surprisingly (or not), this works\r\n\r\nclass F(Formatter):\r\n    def __call__(self, x, pos=None):\r\n       return '%03d' % x\r\n\r\n# This does not work as expected:\r\nax.xaxis.set_major_locator(MaxNLocator(integer=True))  # Both locators get modified\r\nax2.xaxis.set_major_formatter(F())  # Both formatters get modified\r\n```\r\n\r\nI suspect that this has something to do with the fact that `Axis` has a `Ticker` container for the attributes that are behaving inappropriately, and that they are not being copied correctly when the axis is twinned for some reason. I have not been able to trace this problem down yet, but with a few pointer from the experts, I'd probably be able to make a PR. Assuming this is actually an issue, of course.\r\n\r\n- [ ] If this is an image generation bug attach a screenshot demonstrating the issue.\r\n- [ ] If this is a regression (Used to work in an earlier version of Matplotlib), please \r\n      note where it used to work.\r\n","author":{"url":"https://github.com/madphysicist","@type":"Person","name":"madphysicist"},"datePublished":"2016-11-01T21:53:03.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":17},"url":"https://github.com/7376/matplotlib/issues/7376"}