def get_filename(metallicity=0.0, dust=0.0, age=1.0):
    """Generates the standard filename we use to access the files

    Parameters:
    metallicity (float): log(Z) in solar units (so 0.0 is solar metallicity)
    dust (float): dust parameter
    age (float): current age of stellar population in Gyr

    Returns:
    filename (str): Name of the file
    """
    filename = f'Z{metallicity}_d{dust}_t{age}.df'
    return filename