Import this ONCE from a settings.py
import matplotlib
SCREEN_DPI = 72.0
FONT_SIZE = 10.0
PARAMS = {
'font.size': FONT_SIZE,
'legend.fontsize': FONT_SIZE,
'text.fontsize': FONT_SIZE,
'xtick.labelsize': FONT_SIZE,
'ytick.labelsize': FONT_SIZE,
}
matplotlib.rcParams.update(PARAMS)