【Python】NumPy配列ndarrayとPythonのリストを相互に変換

NumPy配列ndarrayとPythonのリストを相互に変換

import numpy as np

list1 = [0, 1, 2]

v1 = np.array(list1)
print(a_1d)
### [0 1 2]

print(type(v1))
### <class 'numpy.ndarray'>

2次元以上の多次元配列

list2 = [[0, 1, 2], [3, 4, 5]]

v2 = np.array(list2)
print(v2)
#  [0 1 2]
#  [3 4 5]

NumPy配列ndarrayをリストに変換: tolist()

list3 = [[0, 1, 2], [3, 4, 5]]

v3 = np.array(list3)
print(v2)
#  [0 1 2]
#  [3 4 5]

list3_back = v3.tolist()
print(list3_back)
# [[0, 1, 2], [3, 4, 5]]