pandas入门02---DataFrame

昨天讲了 数据帧(DataFrame)是二维数据结构，即数据以行和列的表格方式排列。python import pandas as pd data = {'state': ['Ohio', 'Ohio', 'Ohio', 'Nevada', 'Nevada', 'Nevada'], 'year': [2000, 2001, 2002, 2001, 2002, 2003], 'pop':

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