Question: In Python if I have a dataframe like that: How can I change it to: A A B B year 1998 1999 1998 1998 value

In Python if I have a dataframe like that:

In Python if I have a dataframe like that: How can I

How can I change it to:

change it to: A A B B year 1998 1999 1998 1998

A A B B year 1998 1999 1998 1998 value 2 3 2 4 nmn . B 1998 2 2 NN 1999 3 4

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