import math


def to_radians(degrees):
    """Convert an angle from degrees to radians.

    Usage::

        print(to_radians(180.0))  # => 3.141592653589793
        print(to_radians(90.0))  # => 1.5707963267948966

    There is no restriction of the domain of this function, but that also means
    that the codomain is unrestricted. As a concrete example::

        print(to_radians(-180.0))  # => -3.141592653589793
        print(to_radians(720))  # => 12.566370614359172

    :param degrees: An angle (in degrees)
    :returns: The same angle (in radians)
    """
    return math.radians(degrees)