text: import datetime
  import pandas_datareader as pd_dr
  
  class asset_manager:
      def __init__(self, symbol, start=None, end=None):
          self.symbol = symbol
          self.data =  pd_dr.get_data_yahoo(symbol, start, end)
  
      def get_symbol(self):
          return self.symbol
  
  
      def get_return(self):
           return self.data['Adj Close'].diff()
  