select all columns with identical data

[Neal Becker]

In a dataframe, I'd like to find all the columns where all the data (rows) are identical.  Any suggestions?

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Those who don't understand recursion are doomed to repeat it

[Paul Hobson]

If you know that you really want to use all the columns, I do something along these lines (untested):

df.loc[:, 'all_equal'] = df.apply(lambda row: all(row[0] == row), axis=1)

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