Convert pandas dataframe to list of tuples - ('Row', 'Column', Value)

Question

There are a few other questions regarding the same subject, but the format desired is different in all.

I am trying to build a heatmap visualization using holoviews

Answer 1

You can reshape first by stack and then convert to tuples:

tups = [tuple(x) for x in df.stack().reset_index().values.tolist()]

Another similar solution is create 3 levels MultiIndex:

tups = df.stack().to_frame().set_index(0, append=True).index.tolist()

Or zip 3 separately arrays with numpy.repeat, numpy.tile and ravel:

a = np.repeat(df.index, len(df.columns))
b = np.tile(df.columns, len(df))
c = df.values.ravel()

tups = list(zip(a,b,c))