Python リストをNumPy配列ndarrayに変換: numpy.array()

NumPy配列ndarrayとPython標準のリストを相互に変換より
リストをNumPy配列ndarrayに変換: numpy.array()

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import numpy as np   l_1d = [0, 1, 2]   arr_1d = np.array(l_1d)   print(arr_1d) print(arr_1d.dtype) # [0 1 2] # int64   arr_1d_f = np.array(l_1d, dtype=float)   print(arr_1d_f) print(arr_1d_f.dtype) # [0. 1. 2.] # float64

NumPy配列ndarrayをリストに変換: tolist()

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import numpy as np   arr_1d = np.arange(3)   print(arr_1d) # [0 1 2]   l_1d = arr_1d.tolist()   print(l_1d) # [0, 1, 2]