Data Frame: import numpy as np import pandas as pd np.random.seed(1) import datetime today = datetime.date.today() someday = datetime.date(2016, 1, 1) diff =  today - someday rows,cols = diff.days,6 data = np.random.rand(rows,cols)  tidx = pd.date_range('2016-01-01', periods=rows, freq='D') data_frame = pd.DataFrame(data, columns=['a','b','c','d','e','f'], index=tidx) print(data_frame)   Question - Calculate the cumulative sum of the Data frame (using the .cumsum() function) andstore it in a new data frame called: df_accumulate and Plot the six sets of row values of df_accumulate in a graph