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def div(a, b): """ Divide one number by another.

Parameters:
a (int or float): The numerator.
b (int or float): The denominator.

Returns:
float: The result of a divided by b.

Raises:
ZeroDivisionError: If b is zero.
"""
return a / b

def mod(a, b): """ Calculate the modulus of one number by another.

Parameters:
a (int or float): The dividend.
b (int or float): The divisor.

Returns:
int or float: The remainder of a divided by b.
"""
return a % b

def exp(a, b): """ Raise one number to the power of another.

Parameters:
a (int or float): The base.
b (int or float): The exponent.

Returns:
int or float: The result of a raised to the power of b.
"""
return a ** b