Matplotlib:删除关于 matplotlib.use() 的警告 [英] Matplotlib: remove warning about matplotlib.use()

问题描述

在我使用 matplotlib 的 Python 模块中，我想确保当我通过 ssh 在远程机器上运行脚本时它也能正常工作.所以我这样做:

In a Python module where I use matplotlib, I want to make sure it works also when I run the script on a remote machine via ssh. So I do:

import matplotlib
matplotlib.use('Agg')
from matplotlib.backends.backend_pdf import PdfPages
import matplotlib.mlab as mlab
import matplotlib.pyplot as plt
import numpy as np
import pylab
import scipy.stats
import scipy.stats.mstats

它有效.太糟糕了，当我直接在一台机器(不是远程！)上运行它时，它给了我以下警告:

It works. Too bad that when I run it directly on a machine (not a remote one!), it gives me the following warning:

这个对 matplotlib.use() 的调用没有效果，因为后端已经被选中；matplotlib.use() 必须在之前调用pylab、matplotlib.pyplot 或 matplotlib.backends 是为第一次.

This call to matplotlib.use() has no effect because the the backend has already been chosen; matplotlib.use() must be called before pylab, matplotlib.pyplot, or matplotlib.backends is imported for the first time.

如何删除此消息?

推荐答案

虽然我无法测试这个，但 Ipython 告诉我可以设置 warn=False 来支持警告."

While I can't test this Ipython tells me that "one can set warn=False to supporess the warnings."

来源:

matplotlib.use?

Type:       function
String Form:<function use at 0x98da02c>
File:       /usr/lib/pymodules/python2.7/matplotlib/__init__.py
Definition: matplotlib.use(arg, warn=True)
Docstring:
Set the matplotlib backend to one of the known backends.

The argument is case-insensitive.  For the Cairo backend,
the argument can have an extension to indicate the type of
output.  Example:

    use('cairo.pdf')

will specify a default of pdf output generated by Cairo.

.. note::

    This function must be called *before* importing pyplot for
    the first time; or, if you are not using pyplot, it must be called
    before importing matplotlib.backends.  If warn is True, a warning
    is issued if you try and call this after pylab or pyplot have been
    loaded.  In certain black magic use cases, e.g.
    :func:`pyplot.switch_backends`, we are doing the reloading necessary to
    make the backend switch work (in some cases, e.g. pure image
    backends) so one can set warn=False to supporess the warnings.

To find out which backend is currently set, see
:func:`matplotlib.get_backend`.

在文档中发现错别字总是很有趣.

Always fun to find a typo in the docs.

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