Question: How do you add a prefix 'Day _ ' to every column name in a DataFrame df ? How do you add a prefix 'Day

How do you add a prefix 'Day_' to every column name in a DataFrame df?
How do you add a prefix 'Day_' to every column name in a DataFrame df?
df.rename(columns=lambda x: 'Day_'+ x)
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df.columns = 'Day_'+ df.columns
df.add_prefix('Day_')

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