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To repress the scientific notation, use style="plain" in ticklabel_format() method.
The annot only help to add numeric value on python heatmap cell but fmt parameter allows to add string (text) values on the cell. Here, we created a 2D numpy array which contains string values and passes to annot along with that pass a string value “s” to fmt.
According to the docs, the param fmt='.2g' is being applied because you've set annot=True so you can modify the format being applied to:
sns.heatmap(table2,annot=True,cmap='Blues', fmt='g')
According to the docs, the parameter fmt is set to .2g when annot=True. So, for example, if your data is float, you can use:
sns.heatmap(table2, annot=True, cmap='Blues', fmt='.3g')
By that, you're telling python to show 3 significant figures. To understand the "fmt" better, check out this answer: https://stackoverflow.com/a/65020192/4529605
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