カラムごとで、データフレームのindexの行ごとに値を合計して、新たな列を生成する

def add_column(df, col_name, values):
  df[col_name] = pd.Series(values)
  return df
  
add_column(df, 'year', [2020] * len(df))

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Function from Docstring: Provide a docstring to generate the actual function.
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