def get_number(s):
    """ Check that s is number
    
    If s is a number, returns it as a float. If not, returns s without modification.

    Inputs:
        s - An input string or number
    Outputs:
        value - Either float(s) or False if s cannot be cast to float
    """
    try:
        return float(s)
    except ValueError:
        return s