Matplotlib figure, no colour with latex text

plot_latex.py

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

nice_fonts = {
	# Use LaTeX to write all text
	"text.usetex": True,
	"font.family": "serif",
	"axes.labelsize": 11,
	"font.size": 11,
	"legend.fontsize": 10,
	"xtick.labelsize": 10,
	"ytick.labelsize": 10,
}
plt.style.use('default')
mpl.rcParams.update(nice_fonts)
monochrome = (cycler('color', ['k']) * cycler('marker', ['', '.']) *
			  cycler('linestyle', ['-', '--', ':']))
plt.rc('axes', prop_cycle=monochrome)

fig = plt.figure()

plt.plot(<<x>>, <<y>>, marker='o', markersize=3, linewidth=0.75)