Python drawing - use the legend of the graph generated by PLT in to set the font size

1 The main points of

use legend(fontsize=) The method is invalid , Need to add plt Property parameters of

plt.rcParams.update({'font.size':18})

plt.rcParams.update({'font.size':18})

2 Actual operation

plt.rcParams.update({'font.size':18})

plt.legend()

3 Effect display

Plus before

After value