FgcmFitCycleConfig

class lsst.fgcmcal.FgcmFitCycleConfig

Bases: lsst.pipe.base.PipelineTaskConfig

Config for FgcmFitCycle

Attributes Summary

aperCorrFitNBins Number of aperture bins used in aperture correction fit.
aperCorrInputSlopeDict Per-band specification of aperture correction input slope parameters.
aperCorrInputSlopes Aperture correction input slope parameters.
applyRefStarColorCuts Apply color cuts to reference stars? (bool, default True)
approxThroughput Approximate overall throughput at start of calibration observations.
approxThroughputDict Per-band specification of the approximate overall throughput at the start of calibration observations.
autoHighCutNSig Number of sigma for automatic computation of (high) outlier cut.
autoPhotometricCutNSig Number of sigma for automatic computation of (low) photometric cut.
bands Bands to run calibration (List, default [])
brightObsGrayMax Maximum gray extinction to be considered bright observation (float, default 0.15)
ccdGrayFocalPlaneChebyshevOrder Order of the 2D chebyshev polynomials for focal plane fit.
ccdGrayFocalPlaneDict Per-band specification on whether to compute focal-plane residual (‘ccd gray’) corrections.
ccdGrayFocalPlaneFitMinCcd Minimum number of ‘good’ CCDs required to perform focal-plane gray corrections.
ccdGrayMaxStarErr Maximum error on a star observation to use in ccd gray (achromatic residual) computation (float, default 0.1)
ccdGraySubCcd Compute CCD gray terms on sub-ccd scale Deprecated: This field is no longer used, and has been deprecated by DM-23699.
ccdGraySubCcdChebyshevOrder Order of the 2D chebyshev polynomials for sub-ccd gray fit.
ccdGraySubCcdDict Per-band specification on whether to compute achromatic per-ccd residual (‘ccd gray’) on a sub-ccd scale.
ccdGraySubCcdTriangular Should the sub-ccd gray chebyshev matrix be triangular to suppress high-order cross terms? (bool, default True)
coatingMjds Mirror coating dates in MJD (List, default (0.0,))
colorSplitBands Band names to use to split stars by color.
colorSplitIndices Band indices to use to split stars by color Deprecated: This field is no longer used, and has been deprecated by DM-23699.
connections Configurations describing the connections of the PipelineTask to datatypes (Connections, default <class 'lsst.pipe.base.config.Connections'>)
cycleNumber FGCM fit cycle number.
deltaMagBkgOffsetPercentile Percentile brightest stars on a visit/ccd to use to compute net offset from local background subtraction.
deltaMagBkgPerCcd Compute net offset from local background subtraction per-ccd? Otherwise, use computation per visit.
doReferenceCalibration Use reference catalog as additional constraint on calibration (bool, default True)
epochMjds Epoch boundaries in MJD (List, default (0.0,))
expGrayErrRecoverCut Maximum exposure gray error to be able to recover bad ccds via interpolation.
expGrayHighCut Maximum (positive) exposure gray for a visit to be considered photometric.
expGrayHighCutDict Per-band specification on maximum (positive) achromatic exposure residual (‘gray term’) for a visit to be considered photometric.
expGrayInitialCut Maximum exposure/visit gray value for initial selection of possible photometric observations.
expGrayPhotometricCut Maximum (negative) exposure gray for a visit to be considered photometric.
expGrayPhotometricCutDict Per-band specification on maximum (negative) achromatic exposure residual (‘gray term’) for a visit to be considered photometric.
expGrayRecoverCut Maximum (negative) exposure gray to be able to recover bad ccds via interpolation.
expVarGrayPhotometricCut Maximum exposure variance to be considered possibly photometric Deprecated: This field is no longer used, and has been deprecated by DM-23699.
expVarGrayPhotometricCutDict Per-band specification on maximum exposure variance to be considered possibly photometric.
filterMap Mapping from ‘filterName’ to band.
fitBands Bands to use in atmospheric fit.
fitFlag Flag for which bands are directly constrained in the FGCM fit.
fitMirrorChromaticity Fit (intraband) mirror chromatic term? (bool, default False)
focalPlaneSigmaClip Number of sigma to clip outliers per focal-plane.
freezeStdAtmosphere Freeze atmosphere parameters to standard (for testing) (bool, default False)
history
instrumentParsPerBand Model instrumental parameters per band? Otherwise, instrumental parameters (QE changes with time) are shared among all bands.
instrumentSlopeMinDeltaT Minimum time change (in days) between observations to use in constraining instrument slope.
isFinalCycle Is this the final cycle of the fitting? Will automatically compute final selection of stars and photometric exposures, and will output zeropoints and standard stars for use in fgcmOutputProducts (bool, default False)
latitude Observatory latitude (float)
mapLongitudeRef Reference longitude for plotting maps (float, default 0.0)
mapNSide Healpix nside for plotting maps (int, default 256)
maxCcdGrayErr Maximum error on CCD gray offset to be considered photometric (float, default 0.05)
maxIterBeforeFinalCycle Maximum fit iterations, prior to final cycle.
minCcdPerExp Minimum number of good CCDs per exposure/visit to be used in calibration fit.
minExpPerNight Minimum number of good exposures/visits to consider a partly photometric night (int, default 10)
minObsPerBand Minimum good observations per band (int, default 2)
minStarPerCcd Minimum number of good stars per CCD to be used in calibration fit.
minStarPerExp Minimum number of good stars per exposure/visit to be used in calibration fit.
modelMagErrors Should FGCM model the magnitude errors from sky/fwhm? (False means trust inputs) (bool, default True)
nCore Number of cores to use (int, default 4)
nExpPerRun Number of exposures to run in each chunk (int, default 1000)
nStarPerRun Number of stars to run in each chunk (int, default 200000)
outfileBase Filename start for plot output files (str)
outputStandardsBeforeFinalCycle Output standard stars prior to final cycle? Used in debugging.
outputZeropointsBeforeFinalCycle Output standard stars prior to final cycle? Used in debugging.
precomputeSuperStarInitialCycle Precompute superstar flat for initial cycle (bool, default False)
quietMode Be less verbose with logging.
randomSeed Random seed for fgcm for consistency in tests.
refStarOutlierNSig Number of sigma compared to average mag for reference star to be considered an outlier.
refStarSnMin Reference star signal-to-noise minimum to use in calibration.
requiredBands Bands that are required for a star to be considered a calibration star.
requiredFlag Flag for which bands are required for a star to be considered a calibration star in the FGCM fit.
reserveFraction Fraction of stars to reserve for testing (float, default 0.1)
saveMetadata Flag to enable/disable metadata saving for a task, enabled by default.
sedFudgeFactors Fudge factors for computing linear SED from colors.
sedboundaryterms Mapping from bands to SED boundary term names used is sedterms.
sedterms Mapping from terms to bands for fgcm linear SED approximations.
sigFgcmMaxEGray Maximum (absolute) gray value for observation in sigma_FGCM.
sigFgcmMaxEGrayDict Per-band specification for maximum (absolute) achromatic residual (gray value) for observations in sigma_fgcm (raw repeatability).
sigFgcmMaxErr Maximum mag error for fitting sigma_FGCM (float, default 0.01)
sigma0Phot Systematic error floor for all zeropoints (float, default 0.003)
sigmaCalFitPercentile Magnitude percentile range to fit systematic error floor (List, default (0.05, 0.15))
sigmaCalPlotPercentile Magnitude percentile range to plot systematic error floor (List, default (0.05, 0.95))
sigmaCalRange Allowed range for systematic error floor estimation (List, default (0.001, 0.003))
starColorCuts Encoded star-color cuts (to be cleaned up) (List, default ('NO_DATA',))
superStarSigmaClip Number of sigma to clip outliers when selecting for superstar flats (float, default 5.0)
superStarSubCcd Compute superstar flat on sub-ccd scale Deprecated: This field is no longer used, and has been deprecated by DM-23699.
superStarSubCcdChebyshevOrder Order of the 2D chebyshev polynomials for sub-ccd superstar fit.
superStarSubCcdDict Per-band specification on whether to compute superstar flat on sub-ccd scale.
superStarSubCcdTriangular Should the sub-ccd superstar chebyshev matrix be triangular to suppress high-order cross terms? (bool, default False)
useQuadraticPwv Model PWV with a quadratic term for variation through the night? (bool, default False)
useRepeatabilityForExpGrayCuts Use star repeatability (instead of exposures) for computing photometric cuts? Recommended for tract mode or bands with few exposures.
useRepeatabilityForExpGrayCutsDict Per-band specification on whether to use star repeatability (instead of exposures) for computing photometric cuts.
utBoundary Boundary (in UTC) from day-to-day (float)
washMjds Mirror wash MJDs (List, default (0.0,))

Methods Summary

compare(other[, shortcut, rtol, atol, output]) Compare this configuration to another Config for equality.
formatHistory(name, **kwargs) Format a configuration field’s history to a human-readable format.
freeze() Make this config, and all subconfigs, read-only.
items() Get configurations as (field name, field value) pairs.
iteritems() Iterate over (field name, field value) pairs.
iterkeys() Iterate over field names
itervalues() Iterate over field values.
keys() Get field names.
load(filename[, root]) Modify this config in place by executing the Python code in a configuration file.
loadFromStream(stream[, root, filename]) Modify this Config in place by executing the Python code in the provided stream.
names() Get all the field names in the config, recursively.
save(filename[, root]) Save a Python script to the named file, which, when loaded, reproduces this config.
saveToStream(outfile[, root, skipImports]) Save a configuration file to a stream, which, when loaded, reproduces this config.
setDefaults() Subclass hook for computing defaults.
toDict() Make a dictionary of field names and their values.
update(**kw) Update values of fields specified by the keyword arguments.
validate() Validate the Config, raising an exception if invalid.
values() Get field values.

Attributes Documentation

aperCorrFitNBins

Number of aperture bins used in aperture correction fit. When set to 0no fit will be performed, and the config.aperCorrInputSlopes will be used if available. (int, default 10)

aperCorrInputSlopeDict

Per-band specification of aperture correction input slope parameters. These are used on the first fit iteration, and aperture correction parameters will be updated from the data if config.aperCorrFitNBins > 0. It is recommended to set this when there is insufficient data to fit the parameters (e.g. tract mode). (Dict, default {})

aperCorrInputSlopes

Aperture correction input slope parameters. These are used on the first fit iteration, and aperture correction parameters will be updated from the data if config.aperCorrFitNBins > 0. It is recommended to set thiswhen there is insufficient data to fit the parameters (e.g. tract mode). If set, must be same length as config.bands, and matched band-by-band. Deprecated: This field is no longer used, and has been deprecated by DM-23699. It will be removed after v20. Use aperCorrInputSlopeDict instead. (List, default [])

applyRefStarColorCuts

Apply color cuts to reference stars? (bool, default True)

approxThroughput

Approximate overall throughput at start of calibration observations. May be 1 element (same for all bands) or the same length as config.bands. Deprecated: This field is no longer used, and has been deprecated by DM-23699. It will be removed after v20. Use approxThroughputDict instead. (List, default (1.0,))

approxThroughputDict

Per-band specification of the approximate overall throughput at the start of calibration observations. Must have one entry per band. Typically should be 1.0. (Dict, default {})

autoHighCutNSig

Number of sigma for automatic computation of (high) outlier cut. Cut is based on exposure gray width (per band), unless useRepeatabilityForExpGrayCuts is set, in which case the star repeatability is used (also per band). (float, default 4.0)

autoPhotometricCutNSig

Number of sigma for automatic computation of (low) photometric cut. Cut is based on exposure gray width (per band), unless useRepeatabilityForExpGrayCuts is set, in which case the star repeatability is used (also per band). (float, default 3.0)

bands

Bands to run calibration (List, default [])

brightObsGrayMax

Maximum gray extinction to be considered bright observation (float, default 0.15)

ccdGrayFocalPlaneChebyshevOrder

Order of the 2D chebyshev polynomials for focal plane fit. (int, default 3)

ccdGrayFocalPlaneDict

Per-band specification on whether to compute focal-plane residual (‘ccd gray’) corrections. (Dict, default {})

ccdGrayFocalPlaneFitMinCcd

Minimum number of ‘good’ CCDs required to perform focal-plane gray corrections. If there are fewer good CCDs then the gray correction is computed per-ccd. (int, default 1)

ccdGrayMaxStarErr

Maximum error on a star observation to use in ccd gray (achromatic residual) computation (float, default 0.1)

ccdGraySubCcd

Compute CCD gray terms on sub-ccd scale Deprecated: This field is no longer used, and has been deprecated by DM-23699. It will be removed after v20. Use ccdGraySubCcdDict instead. (bool, default False)

ccdGraySubCcdChebyshevOrder

Order of the 2D chebyshev polynomials for sub-ccd gray fit. (int, default 1)

ccdGraySubCcdDict

Per-band specification on whether to compute achromatic per-ccd residual (‘ccd gray’) on a sub-ccd scale. (Dict, default {})

ccdGraySubCcdTriangular

Should the sub-ccd gray chebyshev matrix be triangular to suppress high-order cross terms? (bool, default True)

coatingMjds

Mirror coating dates in MJD (List, default (0.0,))

colorSplitBands

Band names to use to split stars by color. Must have 2 entries. (List, default ('g', 'i'))

colorSplitIndices

Band indices to use to split stars by color Deprecated: This field is no longer used, and has been deprecated by DM-23699. It will be removed after v20. Use colorSplitBands instead. (List, default None)

connections

Configurations describing the connections of the PipelineTask to datatypes (Connections, default <class 'lsst.pipe.base.config.Connections'>)

cycleNumber

FGCM fit cycle number. This is automatically incremented after each run and stage of outlier rejection. See cookbook for details. (int)

deltaMagBkgOffsetPercentile

Percentile brightest stars on a visit/ccd to use to compute net offset from local background subtraction. (float, default 0.25)

deltaMagBkgPerCcd

Compute net offset from local background subtraction per-ccd? Otherwise, use computation per visit. (bool, default False)

doReferenceCalibration

Use reference catalog as additional constraint on calibration (bool, default True)

epochMjds

Epoch boundaries in MJD (List, default (0.0,))

expGrayErrRecoverCut

Maximum exposure gray error to be able to recover bad ccds via interpolation. Visits with more gray variance will only get CCD zeropoints if there are sufficient star observations (minStarPerCcd) on that CCD. (float, default 0.05)

expGrayHighCut

Maximum (positive) exposure gray for a visit to be considered photometric. Must be same length as config.bands, and matched band-by-band. Deprecated: This field is no longer used, and has been deprecated by DM-23699. It will be removed after v20. Use expGrayHighCutDict instead. (List, default (0.0,))

expGrayHighCutDict

Per-band specification on maximum (positive) achromatic exposure residual (‘gray term’) for a visit to be considered photometric. Must have one entry per band. Broad-band filters should be 0.2. (Dict, default {})

expGrayInitialCut

Maximum exposure/visit gray value for initial selection of possible photometric observations. (float, default -0.25)

expGrayPhotometricCut

Maximum (negative) exposure gray for a visit to be considered photometric. Must be same length as config.bands, and matched band-by-band. Deprecated: This field is no longer used, and has been deprecated by DM-23699. It will be removed after v20. Use expGrayPhotometricCutDict instead. (List, default (0.0,))

expGrayPhotometricCutDict

Per-band specification on maximum (negative) achromatic exposure residual (‘gray term’) for a visit to be considered photometric. Must have one entry per band. Broad-band filters should be -0.05. (Dict, default {})

expGrayRecoverCut

Maximum (negative) exposure gray to be able to recover bad ccds via interpolation. Visits with more gray extinction will only get CCD zeropoints if there are sufficient star observations (minStarPerCcd) on that CCD. (float, default -1.0)

expVarGrayPhotometricCut

Maximum exposure variance to be considered possibly photometric Deprecated: This field is no longer used, and has been deprecated by DM-23699. It will be removed after v20. Use expVarGrayPhotometricCutDict instead. (float, default 0.0005)

expVarGrayPhotometricCutDict

Per-band specification on maximum exposure variance to be considered possibly photometric. Must have one entry per band. Broad-band filters should be 0.0005. (Dict, default {})

filterMap

Mapping from ‘filterName’ to band. (Dict, default {})

fitBands

Bands to use in atmospheric fit. The bands not listed here will have the atmosphere constrained from the ‘fitBands’ on the same night. Must be a subset of config.bands (List, default [])

fitFlag

Flag for which bands are directly constrained in the FGCM fit. Bands set to 0 will have the atmosphere constrained from observations in other bands on the same night. Must be same length as config.bands, and matched band-by-band. Deprecated: This field is no longer used, and has been deprecated by DM-23699. It will be removed after v20. Use fitBands instead. (List, default (0,))

fitMirrorChromaticity

Fit (intraband) mirror chromatic term? (bool, default False)

focalPlaneSigmaClip

Number of sigma to clip outliers per focal-plane. (float, default 4.0)

freezeStdAtmosphere

Freeze atmosphere parameters to standard (for testing) (bool, default False)

history
instrumentParsPerBand

Model instrumental parameters per band? Otherwise, instrumental parameters (QE changes with time) are shared among all bands. (bool, default False)

instrumentSlopeMinDeltaT

Minimum time change (in days) between observations to use in constraining instrument slope. (float, default 20.0)

isFinalCycle

Is this the final cycle of the fitting? Will automatically compute final selection of stars and photometric exposures, and will output zeropoints and standard stars for use in fgcmOutputProducts (bool, default False)

latitude

Observatory latitude (float)

mapLongitudeRef

Reference longitude for plotting maps (float, default 0.0)

mapNSide

Healpix nside for plotting maps (int, default 256)

maxCcdGrayErr

Maximum error on CCD gray offset to be considered photometric (float, default 0.05)

maxIterBeforeFinalCycle

Maximum fit iterations, prior to final cycle. The number of iterations will always be 0 in the final cycle for cleanup and final selection. (int, default 50)

minCcdPerExp

Minimum number of good CCDs per exposure/visit to be used in calibration fit. Visits with fewer good CCDs will have CCD zeropoints estimated where possible. (int, default 5)

minExpPerNight

Minimum number of good exposures/visits to consider a partly photometric night (int, default 10)

minObsPerBand

Minimum good observations per band (int, default 2)

minStarPerCcd

Minimum number of good stars per CCD to be used in calibration fit. CCDs with fewer stars will have their calibration estimated from other CCDs in the same visit, with zeropoint error increased accordingly. (int, default 5)

minStarPerExp

Minimum number of good stars per exposure/visit to be used in calibration fit. Visits with fewer good stars will have CCD zeropoints estimated where possible. (int, default 600)

modelMagErrors

Should FGCM model the magnitude errors from sky/fwhm? (False means trust inputs) (bool, default True)

nCore

Number of cores to use (int, default 4)

nExpPerRun

Number of exposures to run in each chunk (int, default 1000)

nStarPerRun

Number of stars to run in each chunk (int, default 200000)

outfileBase

Filename start for plot output files (str)

outputStandardsBeforeFinalCycle

Output standard stars prior to final cycle? Used in debugging. (bool, default False)

outputZeropointsBeforeFinalCycle

Output standard stars prior to final cycle? Used in debugging. (bool, default False)

precomputeSuperStarInitialCycle

Precompute superstar flat for initial cycle (bool, default False)

quietMode

Be less verbose with logging. (bool, default False)

randomSeed

Random seed for fgcm for consistency in tests. (int, default None)

refStarOutlierNSig

Number of sigma compared to average mag for reference star to be considered an outlier. Computed per-band, and if it is an outlier in any band it is rejected from fits. (float, default 4.0)

refStarSnMin

Reference star signal-to-noise minimum to use in calibration. Set to <=0 for no cut. (float, default 50.0)

requiredBands

Bands that are required for a star to be considered a calibration star. Must be a subset of config.bands (List, default [])

requiredFlag

Flag for which bands are required for a star to be considered a calibration star in the FGCM fit. Typically this should be the same as fitFlag. Must be same length as config.bands, and matched band-by-band. Deprecated: This field is no longer used, and has been deprecated by DM-23699. It will be removed after v20. Use requiredBands instead. (List, default (0,))

reserveFraction

Fraction of stars to reserve for testing (float, default 0.1)

saveMetadata

Flag to enable/disable metadata saving for a task, enabled by default. (bool, default True)

sedFudgeFactors

Fudge factors for computing linear SED from colors. Must be same length as config.bands, and matched band-by-band. Deprecated: This field has been deprecated and will be removed after v20. Please use sedSlopeTermMap and sedSlopeMap. (List, default (0,))

sedboundaryterms

Mapping from bands to SED boundary term names used is sedterms. (SedboundarytermDict, default <class 'lsst.fgcmcal.sedterms.SedboundarytermDict'>)

sedterms

Mapping from terms to bands for fgcm linear SED approximations. (SedtermDict, default <class 'lsst.fgcmcal.sedterms.SedtermDict'>)

sigFgcmMaxEGray

Maximum (absolute) gray value for observation in sigma_FGCM. May be 1 element (same for all bands) or the same length as config.bands. Deprecated: This field is no longer used, and has been deprecated by DM-23699. It will be removed after v20. Use sigFgcmMaxEGrayDict instead. (List, default (0.05,))

sigFgcmMaxEGrayDict

Per-band specification for maximum (absolute) achromatic residual (gray value) for observations in sigma_fgcm (raw repeatability). Broad-band filters should be 0.05. (Dict, default {})

sigFgcmMaxErr

Maximum mag error for fitting sigma_FGCM (float, default 0.01)

sigma0Phot

Systematic error floor for all zeropoints (float, default 0.003)

sigmaCalFitPercentile

Magnitude percentile range to fit systematic error floor (List, default (0.05, 0.15))

sigmaCalPlotPercentile

Magnitude percentile range to plot systematic error floor (List, default (0.05, 0.95))

sigmaCalRange

Allowed range for systematic error floor estimation (List, default (0.001, 0.003))

starColorCuts

Encoded star-color cuts (to be cleaned up) (List, default ('NO_DATA',))

superStarSigmaClip

Number of sigma to clip outliers when selecting for superstar flats (float, default 5.0)

superStarSubCcd

Compute superstar flat on sub-ccd scale Deprecated: This field is no longer used, and has been deprecated by DM-23699. It will be removed after v20. Use superStarSubCcdDict instead. (bool, default True)

superStarSubCcdChebyshevOrder

Order of the 2D chebyshev polynomials for sub-ccd superstar fit. Global default is first-order polynomials, and should be overridden on a camera-by-camera basis depending on the ISR. (int, default 1)

superStarSubCcdDict

Per-band specification on whether to compute superstar flat on sub-ccd scale. Must have one entry per band. (Dict, default {})

superStarSubCcdTriangular

Should the sub-ccd superstar chebyshev matrix be triangular to suppress high-order cross terms? (bool, default False)

useQuadraticPwv

Model PWV with a quadratic term for variation through the night? (bool, default False)

useRepeatabilityForExpGrayCuts

Use star repeatability (instead of exposures) for computing photometric cuts? Recommended for tract mode or bands with few exposures. May be 1 element (same for all bands) or the same length as config.bands. Deprecated: This field is no longer used, and has been deprecated by DM-23699. It will be removed after v20. Use useRepeatabilityForExpGrayCutsDict instead. (List, default (False,))

useRepeatabilityForExpGrayCutsDict

Per-band specification on whether to use star repeatability (instead of exposures) for computing photometric cuts. Recommended for tract mode or bands with few visits. (Dict, default {})

utBoundary

Boundary (in UTC) from day-to-day (float)

washMjds

Mirror wash MJDs (List, default (0.0,))

Methods Documentation

compare(other, shortcut=True, rtol=1e-08, atol=1e-08, output=None)

Compare this configuration to another Config for equality.

Parameters:
other : lsst.pex.config.Config

Other Config object to compare against this config.

shortcut : bool, optional

If True, return as soon as an inequality is found. Default is True.

rtol : float, optional

Relative tolerance for floating point comparisons.

atol : float, optional

Absolute tolerance for floating point comparisons.

output : callable, optional

A callable that takes a string, used (possibly repeatedly) to report inequalities.

Returns:
isEqual : bool

True when the two lsst.pex.config.Config instances are equal. False if there is an inequality.

Notes

Unselected targets of RegistryField fields and unselected choices of ConfigChoiceField fields are not considered by this method.

Floating point comparisons are performed by numpy.allclose.

formatHistory(name, **kwargs)

Format a configuration field’s history to a human-readable format.

Parameters:
name : str

Name of a Field in this config.

kwargs

Keyword arguments passed to lsst.pex.config.history.format.

Returns:
history : str

A string containing the formatted history.

freeze()

Make this config, and all subconfigs, read-only.

items()

Get configurations as (field name, field value) pairs.

Returns:
items : list

List of tuples for each configuration. Tuple items are:

  1. Field name.
  2. Field value.
iteritems()

Iterate over (field name, field value) pairs.

Yields:
item : tuple

Tuple items are:

  1. Field name.
  2. Field value.
iterkeys()

Iterate over field names

Yields:
key : str

A field’s key (attribute name).

itervalues()

Iterate over field values.

Yields:
value : obj

A field value.

keys()

Get field names.

Returns:
names : list

List of lsst.pex.config.Field names.

load(filename, root='config')

Modify this config in place by executing the Python code in a configuration file.

Parameters:
filename : str

Name of the configuration file. A configuration file is Python module.

root : str, optional

Name of the variable in file that refers to the config being overridden.

For example, the value of root is "config" and the file contains:

config.myField = 5

Then this config’s field myField is set to 5.

Deprecated: For backwards compatibility, older config files that use root="root" instead of root="config" will be loaded with a warning printed to sys.stderr. This feature will be removed at some point.

See also

lsst.pex.config.Config.loadFromStream, lsst.pex.config.Config.save, lsst.pex.config.Config.saveFromStream

loadFromStream(stream, root='config', filename=None)

Modify this Config in place by executing the Python code in the provided stream.

Parameters:
stream : file-like object, str, or compiled string

Stream containing configuration override code.

root : str, optional

Name of the variable in file that refers to the config being overridden.

For example, the value of root is "config" and the file contains:

config.myField = 5

Then this config’s field myField is set to 5.

Deprecated: For backwards compatibility, older config files that use root="root" instead of root="config" will be loaded with a warning printed to sys.stderr. This feature will be removed at some point.

filename : str, optional

Name of the configuration file, or None if unknown or contained in the stream. Used for error reporting.

See also

lsst.pex.config.Config.load, lsst.pex.config.Config.save, lsst.pex.config.Config.saveFromStream

names()

Get all the field names in the config, recursively.

Returns:
names : list of str

Field names.

save(filename, root='config')

Save a Python script to the named file, which, when loaded, reproduces this config.

Parameters:
filename : str

Desination filename of this configuration.

root : str, optional

Name to use for the root config variable. The same value must be used when loading (see lsst.pex.config.Config.load).

saveToStream(outfile, root='config', skipImports=False)

Save a configuration file to a stream, which, when loaded, reproduces this config.

Parameters:
outfile : file-like object

Destination file object write the config into. Accepts strings not bytes.

root

Name to use for the root config variable. The same value must be used when loading (see lsst.pex.config.Config.load).

skipImports : bool, optional

If True then do not include import statements in output, this is to support human-oriented output from pipetask where additional clutter is not useful.

setDefaults()

Subclass hook for computing defaults.

Notes

Derived Config classes that must compute defaults rather than using the Field instances’s defaults should do so here. To correctly use inherited defaults, implementations of setDefaults must call their base class’s setDefaults.

toDict()

Make a dictionary of field names and their values.

Returns:
dict_ : dict

Dictionary with keys that are Field names. Values are Field values.

Notes

This method uses the toDict method of individual fields. Subclasses of Field may need to implement a toDict method for this method to work.

update(**kw)

Update values of fields specified by the keyword arguments.

Parameters:
kw

Keywords are configuration field names. Values are configuration field values.

Notes

The __at and __label keyword arguments are special internal keywords. They are used to strip out any internal steps from the history tracebacks of the config. Do not modify these keywords to subvert a Config instance’s history.

Examples

This is a config with three fields:

>>> from lsst.pex.config import Config, Field
>>> class DemoConfig(Config):
...     fieldA = Field(doc='Field A', dtype=int, default=42)
...     fieldB = Field(doc='Field B', dtype=bool, default=True)
...     fieldC = Field(doc='Field C', dtype=str, default='Hello world')
...
>>> config = DemoConfig()

These are the default values of each field:

>>> for name, value in config.iteritems():
...     print(f"{name}: {value}")
...
fieldA: 42
fieldB: True
fieldC: 'Hello world'

Using this method to update fieldA and fieldC:

>>> config.update(fieldA=13, fieldC='Updated!')

Now the values of each field are:

>>> for name, value in config.iteritems():
...     print(f"{name}: {value}")
...
fieldA: 13
fieldB: True
fieldC: 'Updated!'
validate()

Validate the Config, raising an exception if invalid.

Raises:
lsst.pex.config.FieldValidationError

Raised if verification fails.

Notes

The base class implementation performs type checks on all fields by calling their validate methods.

Complex single-field validation can be defined by deriving new Field types. For convenience, some derived lsst.pex.config.Field-types (ConfigField and ConfigChoiceField) are defined in lsst.pex.config that handle recursing into subconfigs.

Inter-field relationships should only be checked in derived Config classes after calling this method, and base validation is complete.

values()

Get field values.

Returns:
values : list

List of field values.