[Python] List unique values in a Pandas dataframe

I know that

df.name.unique()


will give unique values in ONE column 'name'.

For example:

name report year
Coch Jason 2012
Pima Molly 2012
Santa Tina 2013
Mari Jake 2014
Yuma Amy 2014

array(['Jason', 'Molly', 'Tina', 'Jake', 'Amy'], dtype=object)


However, let's say I have ~1000 columns and I want to see all columns' unique values all together.

How do I do it?

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