How to edit the label font sizes on building a treemap with squarify in Python?

Update: There is now a possibility to change the fontsize (squarify==0.3.0 or higher) via the text_kwargs parameter:

ax = squarify.plot(countryPop, color=colors, label=labels, ax=ax, bar_kwargs={'alpha':.7}, text_kwargs={'fontsize':10})

the squarify works on matplotlib pyplot so you just need change de font size of pyplot.

I use to do the following thing on my plotting codes.

SMALL_SIZE = 13
MEDIUM_SIZE = 18
BIGGER_SIZE = 23

plt.rc('font', size=MEDIUM_SIZE)          # controls default text sizes
plt.rc('axes', titlesize=BIGGER_SIZE)     # fontsize of the axes title
plt.rc('axes', labelsize=BIGGER_SIZE)     # fontsize of the x and y labels
plt.rc('xtick', labelsize=MEDIUM_SIZE)    # fontsize of the tick labels
plt.rc('ytick', labelsize=MEDIUM_SIZE)    # fontsize of the tick labels
plt.rc('legend', fontsize=SMALL_SIZE)    # legend fontsize
plt.rc('figure', titlesize=BIGGER_SIZE)   # fontsize of the figure title

This way you can change any font of your plot, including in the squarify treemap plot.

#Fonts demo (kwargs)
#Set font properties using kwargs.

#See Fonts demo (object-oriented style) to achieve the same effect using setters.


squarify.plot(sizes=volume, label=labels,text_kwargs={'fontsize':10, 'fontname':"Times New Roman Bold",'weight':'bold'},color=color_list, alpha=0.9)


#Fonts demo(kwargs) 
# https://matplotlib.org/3.1.0/gallery/text_labels_and_annotations/fonts_demo_kw.html