How to create a seaborn.heatmap() with frames around the tiles?

Question

I rendered a heatmap with seaborn.heatmap() works nicely. However, for a certain purpose I need frames around the plot.

matplotlib.rcParams['axes.edgecolor'] = 'black'
matplotlib.rcParams['axes.linewidth'] = 1

both don't work.

Answer 1

ax = sns.heatmap(x)
for _, spine in ax.spines.items():
    spine.set_visible(True)