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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:

def historical_pandas_yahoo(symbol, source='yahoo', start=None, end=None):
    '''
    Fetch from yahoo! finance historical quotes
    '''
    #NOTE Panel for multiple symbols ?
    #NOTE Adj Close column name not cool (a space)
    return DataReader(symbol, source, start=start, end=end)