lf = [('AXP', 'American Express Company', '86.40'), ('BA', 'The Boeing Company', '122.64'), (

根據如下數據： lf = [('AXP', 'American Express Company', '86.40'), ('BA', 'The Boeing Company', '122.64'), ('CAT', 'Caterpillar Inc.', '99.44'), (‘CSCO’, ‘Cisco Systems,Inc.', '23.78'), ('CVX', 'Chevr

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