acronym.py 文件源码

def getdark(expt):
    """
    Generate a dark given an exposure time or scale down from longest dark available

    Parameters
    ----------
    expt : exposure time (in the data frame: df['exp'])

    Returns
    -------
    dark : dark image for that exposure time (numpy array)
    """

    try:
        dark = pyfits.getdata(os.path.join(cals_direc,'master_dark_{0}.fits'.format(expt)))
    except IOError:
        scaleto = np.max(df['exp'][df['exp'] != ''])
        dark = pyfits.getdata(os.path.join(cals_direc,'master_dark_{0}.fits'.format(scaleto)))
        dark *= (expt/scaleto)
    return dark



### CREATE MASTER BIAS #######################################