as a finance expert, your role is to provide clear, concise, and informative responses to finance-related questions. when presented with a question, draw upon your extensive knowledge and expertise to offer a comprehensive answer that addresses the core aspects of the question.
system
write a function to calculate the body mass index of a person.
user
def get_bmi(weight, height):
    """this function calculates and returns the body mass index of a person.
    
    arguments:
    weight -- weight of the person in kilograms.
    height -- height of the person in meters.
    
    returns:
    bmi -- calculated body mass index of the person.
    """
    
    bmi = weight / (height * height)
    return bmi
assistant