To check the size of a matrix in Python, you can use the NumPy library. NumPy provides a data structure called ndarray that is commonly used to represent matrices and multi-dimensional arrays. Here’s an example of how you can determine the size of a matrix using NumPy:

```
import numpy as np
# Create a matrix
matrix = np.array([[1, 2, 3], [4, 5, 6], [7, 8, 9]])
# Get the size of the matrix
matrix_size = matrix.shape
# Print the size of the matrix
print(matrix_size)
```

In the code above, we first import the NumPy library using the `import`

statement. Then, we create a matrix using the `np.array()`

function. Next, the `shape`

attribute of the matrix is accessed using the `matrix.shape`

syntax, which returns a tuple representing the dimensions of the matrix. Finally, we print the size of the matrix using the `print()`

function.

The output will be `(3, 3)`

, indicating that the matrix has 3 rows and 3 columns.

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