python DataFrame: get 'set' from DataFrame elements -


how can 'set' data dataframe elements?

for example, if have data as

df = dataframe([['a','b','z'], ['a', 'c'], ['d']])

i 

{'a', 'b', 'c', 'd', 'z'}

(type: set)

if use sentence, can code it. however, if there way calculate pandas, use it.

dataframe.stack(dropna=true) per default drops nans

in [56]: df.stack().tolist() out[56]: ['a', 'b', 'z', 'a', 'c', 'd']

or set:

in [57]: set(df.stack().tolist()) out[57]: {'a', 'b', 'c', 'd', 'z'}

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