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  1. This question is validated if, without having used a for loop, the outputted DataFrame shape's (261, 5) and your output is the same as the one return with this line of code:

    market_data.loc[market_data.index.get_level_values('Ticker')=='AAPL'].sort_index().pct_change()
    

The DataFrame contains random data. Make sure your output and the one returned by this code is based on the same DataFrame.