Heatmap block float numbers not displaying

Hi , Thank you for such a beautiful lecture and informational course !! 

I was hoping if you could guide me as to why I am unable to view the floating numbers in the block of colors for the heatmap .

Here is the code I had used to run the same :

plt.figure(figsize=(12, 9))
s = sns.heatmap(data.corr(),
                annot=True, 
                cmap='RdBu', 
                vmin = -1, 
                vmax = 1,
                fmt='.2f') 
s.set_yticklabels(s.get_yticklabels(), rotation=0, fontsize=12)
s.set_xticklabels(s.get_xticklabels(), rotation=90, fontsize=12)
plt.title('Correlation Heatmap')
plt.show()