Question: Assume that we have a data frame object named df and we want to set the date column as its index. When we execute the

Assume that we have a data frame object named df and we want to set the date column as its index. When we execute the line below, we observe that the variable df becomes none. What is the reason and how we can fix it? Assume Df = df.set_index(date, inplace = true)

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