# Import the library
import numpy as np
# Create a 1D array
a = np.array([1, 2, 3])
# Create a 2D array
b = np.array([[1, 2, 3], [4, 5, 6]])
# Get the shape of an array
a.shape
# Get the number of dimensions of an array
b.ndim
# Get the size (number of elements) of an array
a.size
# Access elements of a 2D array
b[0, 0]
# Perform element-wise addition
np.add(a, a)
# Perform element-wise multiplication
np.multiply(a, a)
# Calculate the dot product of two arrays
np.dot(a, a)
# Calculate the mean of an array
np.mean(a)
# Reshape an array
a.reshape((3, 1))
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