Matplotlib：删除有关 matplotlib.use() 的警告

在我使用的Python模块中matplotlib，我想确保当我通过以下方式在远程计算机上运行脚本时它也能工作ssh。所以我这样做：

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

有用。太糟糕了，当我运行它时directly在机器上（不是远程的！），它给了我以下警告：

对 matplotlib.use() 的调用没有效果，因为后端 已经被选择了；必须调用 matplotlib.use()before导入 pylab、matplotlib.pyplot 或 matplotlib.backends 第一次。

如何删除此消息？

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”。

Source:

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`.

在文档中发现拼写错误总是很有趣。