numpy 的reshape

import numpy as np

a = np.random.randn(2, 3)
print(a)

b = a.reshape(3, 2)
print(b)

# a本身形状不变
print(a)

# 但此时, a, b指向的内存是相同的, 但是id又不一致
a[0, 0] = 999  # a改变的时候 b也会改变
print(a)
print(b)