<｜begin▁of▁sentence｜>### Instruction:
As an Electrical Technician, you have just installed a custom Matrix class that allows for the instantiation of a 2x2 matrix. A team member has requested assistance with obtaining a string representation of this matrix using the __str__ method. How can you achieve this using the custom Matrix class's API?
### Response:
import Matrix

# Instantiate a matrix
mat = Matrix.Matrix([[1, 2], [3, 4]])

# Get a string representation of the matrix
str_mat = mat.__str__()
print(str_mat)
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