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I installed the wooldridge and panda pckages, put I keep gettin a message says: AttributeError: 'DataFrame' object has no attribute append. when running this code:

I installed the wooldridge and panda pckages, put I keep gettin a message says: AttributeError: 'DataFrame' object has no attribute append. when running this code: df3=df1.append({'year':2014, 'product1': 10, 'product2': 8, 'product3': 2},ignore_index=True) print(df3)

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