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1. Add new rows to dataframe using existing rows from previous year
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2. Create new columns in a data frame based on an existing numeric column, a list of strings as column names and a list of tuples as values
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3. Pandas groupby transform to get not null date value
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4. ValueError: object too deep for desired array while using cross correlation
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5. Divide each cell in dataframe by max of of that column in pandas
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