python - Matplotlib:删除有关 matplotlib.use() 的警告

Question

在我使用 matplotlib 的 Python 模块中，当我通过 ssh 在远程机器上运行脚本时，我想确保它也能正常工作。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

它有效。太糟糕了，当我在机器上直接运行它时(不是远程机器!)，它会给我以下警告:

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？

Answer 1

虽然我无法测试这个 Ipython 告诉我“可以设置 warn=False 来支持警告。”

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`.

在文档中发现拼写错误总是很有趣。