如何抑制 matplotlib 警告？

Question

I am getting an warning from matplotlib every time I import pandas :

/usr/local/lib/python2.7/site-packages/matplotlib/__init__.py:872: UserWarning: axes.color_cycle is deprecated and replaced with axes.prop_cycle; please use the latter.


 warnings.warn(self.msg_depr % (key, alt_key))

What is the best way to suppress it? All packages are up-to-date.

Conf: OSX with a brew Python 2.7.10 (default, Jul 13 2015, 12:05:58), and pandas==0.17.0 and matplotlib==1.5.0

Answer 1

You can suppress all warnings:

import warnings
warnings.filterwarnings("ignore")

import pandas

Answer 2

You can either suppress the warning messages as suggested by AndreL or you can resolve this specific issue and stop getting the warning message once and for all. If you want the latter, do the following.

Open your matplotlibrc file and search for axes.color_cycle . If you're getting the warning message it means that your matplotlibrc file should show something like this:

axes.color_cycle : b, g, r, c, m, y, k  # color cycle for plot lines

You should replace that line by this:

axes.prop_cycle : cycler('color', ['b', 'g', 'r', 'c', 'm', 'y', 'k'])

And the warning message should be gone.

Answer 3

Rather than hiding everything, you can also hide specific warnings. For instance if we want to hide only matplotlib warnings:

warnings.filterwarnings( "ignore", module = "matplotlib\..*" )

The filter can be customised down to the exact message and line number of the file in which the warning originates, let's say if it's just one warning that annoys you and not matplotlib as a whole. See https://docs.python.org/3/library/warnings.html for more details.

Answer 4

You can suppress the warning UserWarning: axes.color_cycle is deprecated and replaced with axes.prop_cycle; please use the latter. UserWarning: axes.color_cycle is deprecated and replaced with axes.prop_cycle; please use the latter. by using prop_cycle at the appropriate place.

For example, in the place you had used color_cycle :

matplotlib.rcParams['axes.color_cycle'] = ['r', 'k', 'c']

Replace it with the following:

matplotlib.rcParams['axes.prop_cycle'] = mpl.cycler(color=["r", "k", "c"]) 

For a greater glimpse, here is an example:

import matplotlib.pyplot as plt
import matplotlib as mpl
import numpy as np

mpl.rcParams['axes.prop_cycle'] = mpl.cycler(color=["r", "k", "c"]) 

x = np.linspace(0, 20, 100)

fig, axes = plt.subplots(nrows=2)

for i in range(10):
    axes[0].plot(x, i * (x - 10)**2)

for i in range(10):
    axes[1].plot(x, i * np.cos(x))

plt.show()

Answer 5

如果你正在使用日志模块，试试这个： logging.getLogger('matplotlib').setLevel(level=logging.CRITICAL)

Answer 6

降级到matplotlib 1.4.3之前的稳定版本。