[Python] How to find if all the columns in a dataframe are object dtype?

Let's say I have a DataFrame as data, and I want to find if every single column in the data frame is an object and use it as an if condition.

example:

describe = data.describe
(if condition to find all the columns are 'object'):
agg = data.agg(['a','b','c'])
if not agg.empty:
describe = pd.concat(describe,agg)
describe = describe.round(2)

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