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代码from pandas import Series import pandas as pd #手动设置索引 obj1 = Series ( [4, 7...

代码from pandas import Series,DataFrame # import pandas as pd obj = Series( [4...

代码import numpy as np arr1 = np.arange(10) print(arr1) print( arr1[5] ) print...

代码import numpy as np #列表与标量计算 print( arr2 * 10) data = [[1,2,3], [4,5,6]] a...

代码import numpy as np arr1 = np.array([2, 3, 4]) print(arr1) print(arr1.dtype...