# PersistenceStep¶

class jwst.persistence.PersistenceStep(name=None, parent=None, config_file=None, _validate_kwds=True, **kws)[source]

PersistenceStep: Correct a science image for persistence.

Create a Step instance.

Parameters
• name (str, optional) – The name of the Step instance. Used in logging messages and in cache filenames. If not provided, one will be generated based on the class name.

• parent (Step instance, optional) – The parent step of this step. Used to determine a fully-qualified name for this step, and to determine the mode in which to run this step.

• config_file (str path, optional) – The path to the config file that this step was initialized with. Use to determine relative path names of other config files.

• **kws (dict) – Additional parameters to set. These will be set as member variables on the new Step instance.

Attributes Summary

Methods Summary

 process(input) This is where real work happens.

Attributes Documentation

reference_file_types = ['trapdensity', 'trappars', 'persat']
spec = '\n # input_trapsfilled is the name of the most recent trapsfilled\n # file for the current detector.\n input_trapsfilled = string(default="")\n # Pixels that have received a persistence correction greater than\n # or equal to flag_pers_cutoff DN will be flagged in the pixeldq\n # extension of the output (rootname_persistence.fits) file.\n flag_pers_cutoff = float(default=40.)\n # if save_persistence is True, the persistence that was\n # subtracted (group by group, integration by integration) will be\n # written to an output file with suffix "_output_pers".\n save_persistence = boolean(default=False)\n # If save_trapsfilled is True, the updated trapsfilled file will\n # be written to an output file with suffix "_trapsfilled".\n save_trapsfilled = boolean(default=True)\n '

Methods Documentation

process(input)[source]

This is where real work happens. Every Step subclass has to override this method. The default behaviour is to raise a NotImplementedError exception.