Assigning a dataframe columns to a for loop syntax question

Assigning a dataframe columns to a for loop syntax question

I wanted to set the columns of a data frame to lower case like this:

I wanted to set the columns of a data frame to lower case like this:

df.columns = [i.lower() for i in df.columns]

Why are the brackets necessary for this to work? Sorry I'm a bit hazy on the syntax. Is there a better alternative to what I'm doing?

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