Making Plots in Jupyter Notebook Beautiful & More Meaningful 11.03.2020 · Similarly, ylabel() is for assigning labels to the y-axis. The fontsize is a matplotlib text keyword argument( **kwargs) and is used to control the size of the fonts of the labels. plt.xlabel('x', fontsize=15) plt.ylabel('PDF', fontsize=15) Setting Axes Limit. Matplotlib sets the default axes limits if the axes limits are not specifically ...