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import numpy as np
np_array = np.empty(5)
print(np_array)
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x = np.zeros((3, 5, 2), dtype=np.complex128)
>>> x.size
30
>>> np.prod(x.shape)
30
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a = np.arange(3)
b = np.arange(12).reshape((3, 4))
c = np.arange(24).reshape((2, 3, 4))
# it returns the total number of elements
print(a.size) # 3
print(b.size) # 12
print(c.size) # 24