[Python] Is there a way I can show the values of the correlation coefficient on my heatmap?

I was wondering if anyone could help me with my codes. I would like to display the actual correlation coefficient values on each squares in my plot. My code below does not seem to do that.Any ideas please?

My codes:

full_cor = df_no_actual_SM.corr()

# Plot correlation heatmap
mask = np.triu(np.ones_like(full_cor, dtype=bool))


#plt.figure(figsize=(20, 20))
sns.set(font_scale=1.5)

fig, ax = plt.subplots(figsize=(20, 20))
ax.patch.set_facecolor('none')

sns.heatmap(full_cor, annot=True, annot_kws={"size": 1, "color": "k"}, mask=mask, cmap='Greys', cbar=True, square=True, cbar_kws={"shrink": 0.7}, ax = ax)
ax.set_title('', fontsize = 20)
ax.tick_params(axis='x', labelsize=24, rotation=45)
ax.tick_params(axis='y', labelsize=24, rotation=45)
#plt.savefig("Corr_plot_R80_Nov18.png")
plt.tight_layout()
plt.show()

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