How to change legend size with matplotlib.pyplot

You can set an individual font size for the legend by adjusting the prop keyword.

plot.legend(loc=2, prop={'size': 6})

This takes a dictionary of keywords corresponding to matplotlib.font_manager.FontProperties properties. See the documentation for legend:

Keyword arguments:

prop: [ None | FontProperties | dict ]
    A matplotlib.font_manager.FontProperties instance. If prop is a 
    dictionary, a new instance will be created with prop. If None, use
    rc settings.

It is also possible, as of version 1.2.1, to use the keyword fontsize.

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