How to suppress matplotlib warning?

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.

You can suppress the warning 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()

If you are using the logging module, try this:
logging.getLogger(‘matplotlib’).setLevel(level=logging.CRITICAL)

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.