import numpy as np
a = np.array([1,2,3,4,5])
slice = a[:3]
slice[0] = 100
print(a)
# result [100,2,3,4,5]

numpy Truncate the array part and python Of list The interception part is different , It doesn't create new arrays , It just points to the part of the original array , So when you modify a value in the truncated part , The original array will also be modified , They all point to the same array

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