def converter(temperatures, convert):
    """Returns a sequence that converts each Celsius temperature to Fahrenheit

    >>> def convert(x):
    ...     return 9.0*x/5.0 + 32
    >>> temperatures = [10, 20, 30, 40, 50]
    >>> converter(temperatures, convert)
    [50.0, 68.0, 86.0, 104.0, 122.0]
    """
    return [convert(x) for x in temperatures]