lsst.pex.config.config.Config Class Reference

Inheritance diagram for lsst.pex.config.config.Config:

Public Member Functions
def	__iter__ (self)
def	keys (self)
def	values (self)
def	items (self)
def	iteritems (self)
def	itervalues (self)
def	iterkeys (self)
def	__contains__ (self, name)
	Return True if the specified field exists in this config. More...
def	__new__ (cls, *args, **kw)
def	__reduce__ (self)
def	setDefaults (self)
def	update (self, **kw)
def	load (self, filename, root="config")
def	loadFromStream (self, stream, root="config", filename=None)
def	save (self, filename, root="config")
def	saveToStream (self, outfile, root="config", skipImports=False)
def	freeze (self)
def	toDict (self)
def	names (self)
def	validate (self)
def	formatHistory (self, name, **kwargs)
def	__setattr__ (self, attr, value, at=None, label="assignment")
def	__delattr__ (self, attr, at=None, label="deletion")
def	__eq__ (self, other)
def	__ne__ (self, other)
def	__str__ (self)
def	__repr__ (self)
def	compare (self, other, shortcut=True, rtol=1E-8, atol=1E-8, output=None)
def	__init_subclass__ (cls, **kwargs)
def	__setattr__ (cls, name, value)

Properties
	history = property(lambda x: x._history)

Detailed Description

Base class for configuration (*config*) objects.

Notes
-----
A ``Config`` object will usually have several `~lsst.pex.config.Field`
instances as class attributes. These are used to define most of the base
class behavior.

``Config`` implements a mapping API that provides many `dict`-like methods,
such as `keys`, `values`, `items`, `iteritems`, `iterkeys`, and
`itervalues`. ``Config`` instances also support the ``in`` operator to
test if a field is in the config. Unlike a `dict`, ``Config`` classes are
not subscriptable. Instead, access individual fields as attributes of the
configuration instance.

Examples
--------
Config classes are subclasses of ``Config`` that have
`~lsst.pex.config.Field` instances (or instances of
`~lsst.pex.config.Field` subclasses) as class attributes:

>>> from lsst.pex.config import Config, Field, ListField
>>> class DemoConfig(Config):
...     intField = Field(doc="An integer field", dtype=int, default=42)
...     listField = ListField(doc="List of favorite beverages.", dtype=str,
...                           default=['coffee', 'green tea', 'water'])
...
>>> config = DemoConfig()

Configs support many `dict`-like APIs:

>>> config.keys()
['intField', 'listField']
>>> 'intField' in config
True

Individual fields can be accessed as attributes of the configuration:

>>> config.intField
42
>>> config.listField.append('earl grey tea')
>>> print(config.listField)
['coffee', 'green tea', 'water', 'earl grey tea']

Definition at line 745 of file config.py.

Member Function Documentation

__contains__()

def lsst.pex.config.config.Config.__contains__	(		self,
			name
	)

Return True if the specified field exists in this config.

    @param[in] name  field name to test for

Definition at line 886 of file config.py.

    def __contains__(self, name):
        """!Return True if the specified field exists in this config
 
        @param[in] name  field name to test for
        """
        return self._storage.__contains__(name)
 

__delattr__()

def lsst.pex.config.config.Config.__delattr__	(		self,
			attr,
			at = None,
			label = "deletion"
	)

Definition at line 1369 of file config.py.

    def __delattr__(self, attr, at=None, label="deletion"):
        if attr in self._fields:
            if at is None:
                at = getCallStack()
            self._fields[attr].__delete__(self, at=at, label=label)
        else:
            object.__delattr__(self, attr)
 

__eq__()

def lsst.pex.config.config.Config.__eq__	(		self,
			other
	)

Definition at line 1377 of file config.py.

    def __eq__(self, other):
        if type(other) == type(self):
            for name in self._fields:
                thisValue = getattr(self, name)
                otherValue = getattr(other, name)
                if isinstance(thisValue, float) and math.isnan(thisValue):
                    if not math.isnan(otherValue):
                        return False
                elif thisValue != otherValue:
                    return False
            return True
        return False
 

__init_subclass__()

def lsst.pex.config.config.Config.__init_subclass__	(		cls,
		**	kwargs
	)

Run initialization for every subclass.

Specifically registers the subclass with a YAML representer
and YAML constructor (if pyyaml is available)

Reimplemented in lsst.pipe.tasks.dataFrameActions._baseDataFrameActions.DataFrameAction.

Definition at line 1447 of file config.py.

    def __init_subclass__(cls, **kwargs):
        """Run initialization for every subclass.
 
        Specifically registers the subclass with a YAML representer
        and YAML constructor (if pyyaml is available)
        """
        super().__init_subclass__(**kwargs)
 
        if not yaml:
            return
 
        yaml.add_representer(cls, _yaml_config_representer)
 

__iter__()

def lsst.pex.config.config.Config.__iter__

(

self

)

Iterate over fields.

Definition at line 791 of file config.py.

    def __iter__(self):
        """Iterate over fields.
        """
        return self._fields.__iter__()
 

__ne__()

def lsst.pex.config.config.Config.__ne__	(		self,
			other
	)

Definition at line 1390 of file config.py.

    def __ne__(self, other):
        return not self.__eq__(other)
 

__new__()

def lsst.pex.config.config.Config.__new__	(		cls,
		*	args,
		**	kw
	)

Allocate a new `lsst.pex.config.Config` object.

In order to ensure that all Config object are always in a proper state
when handed to users or to derived `~lsst.pex.config.Config` classes,
some attributes are handled at allocation time rather than at
initialization.

This ensures that even if a derived `~lsst.pex.config.Config` class
implements ``__init__``, its author does not need to be concerned about
when or even the base ``Config.__init__`` should be called.

Definition at line 893 of file config.py.

    def __new__(cls, *args, **kw):
        """Allocate a new `lsst.pex.config.Config` object.
 
        In order to ensure that all Config object are always in a proper state
        when handed to users or to derived `~lsst.pex.config.Config` classes,
        some attributes are handled at allocation time rather than at
        initialization.
 
        This ensures that even if a derived `~lsst.pex.config.Config` class
        implements ``__init__``, its author does not need to be concerned about
        when or even the base ``Config.__init__`` should be called.
        """
        name = kw.pop("__name", None)
        at = kw.pop("__at", getCallStack())
        # remove __label and ignore it
        kw.pop("__label", "default")
 
        instance = object.__new__(cls)
        instance._frozen = False
        instance._name = name
        instance._storage = {}
        instance._history = {}
        instance._imports = set()
        # load up defaults
        for field in instance._fields.values():
            instance._history[field.name] = []
            field.__set__(instance, field.default, at=at + [field.source], label="default")
        # set custom default-overides
        instance.setDefaults()
        # set constructor overides
        instance.update(__at=at, **kw)
        return instance
 

__reduce__()

def lsst.pex.config.config.Config.__reduce__

(

self

)

Reduction for pickling (function with arguments to reproduce).

We need to condense and reconstitute the `~lsst.pex.config.Config`,
since it may contain lambdas (as the ``check`` elements) that cannot
be pickled.

Definition at line 926 of file config.py.

    def __reduce__(self):
        """Reduction for pickling (function with arguments to reproduce).
 
        We need to condense and reconstitute the `~lsst.pex.config.Config`,
        since it may contain lambdas (as the ``check`` elements) that cannot
        be pickled.
        """
        # The stream must be in characters to match the API but pickle
        # requires bytes
        stream = io.StringIO()
        self.saveToStream(stream)
        return (unreduceConfig, (self.__class__, stream.getvalue().encode()))
 

__repr__()

def lsst.pex.config.config.Config.__repr__

(

self

)

Definition at line 1396 of file config.py.

    def __repr__(self):
        return "%s(%s)" % (
            _typeStr(self),
            ", ".join("%s=%r" % (k, v) for k, v in self.toDict().items() if v is not None)
        )
 

__setattr__() [1/2]

def lsst.pex.config.config.ConfigMeta.__setattr__ (   cls,   name,   value  )

inherited

Definition at line 189 of file config.py.

    def __setattr__(cls, name, value):
        if isinstance(value, Field):
            value.name = name
            cls._fields[name] = value
        type.__setattr__(cls, name, value)
 
 

__setattr__() [2/2]

def lsst.pex.config.config.Config.__setattr__	(		self,
			attr,
			value,
			at = None,
			label = "assignment"
	)

Set an attribute (such as a field's value).

Notes
-----
Unlike normal Python objects, `~lsst.pex.config.Config` objects are
locked such that no additional attributes nor properties may be added
to them dynamically.

Although this is not the standard Python behavior, it helps to protect
users from accidentally mispelling a field name, or trying to set a
non-existent field.

Definition at line 1337 of file config.py.

    def __setattr__(self, attr, value, at=None, label="assignment"):
        """Set an attribute (such as a field's value).
 
        Notes
        -----
        Unlike normal Python objects, `~lsst.pex.config.Config` objects are
        locked such that no additional attributes nor properties may be added
        to them dynamically.
 
        Although this is not the standard Python behavior, it helps to protect
        users from accidentally mispelling a field name, or trying to set a
        non-existent field.
        """
        if attr in self._fields:
            if self._fields[attr].deprecated is not None:
                fullname = _joinNamePath(self._name, self._fields[attr].name)
                warnings.warn(f"Config field {fullname} is deprecated: {self._fields[attr].deprecated}",
                              FutureWarning, stacklevel=2)
            if at is None:
                at = getCallStack()
            # This allows Field descriptors to work.
            self._fields[attr].__set__(self, value, at=at, label=label)
        elif hasattr(getattr(self.__class__, attr, None), '__set__'):
            # This allows properties and other non-Field descriptors to work.
            return object.__setattr__(self, attr, value)
        elif attr in self.__dict__ or attr in ("_name", "_history", "_storage", "_frozen", "_imports"):
            # This allows specific private attributes to work.
            self.__dict__[attr] = value
        else:
            # We throw everything else.
            raise AttributeError("%s has no attribute %s" % (_typeStr(self), attr))
 

__str__()

def lsst.pex.config.config.Config.__str__

(

self

)

Definition at line 1393 of file config.py.

    def __str__(self):
        return str(self.toDict())
 

compare()

def lsst.pex.config.config.Config.compare	(		self,
			other,
			shortcut = True,
			rtol = 1E-8,
			atol = 1E-8,
			output = None
	)

Compare this configuration to another `~lsst.pex.config.Config` for
equality.

Parameters
----------
other : `lsst.pex.config.Config`
    Other `~lsst.pex.config.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.

See also
--------
lsst.pex.config.compareConfigs

Notes
-----
Unselected targets of `~lsst.pex.config.RegistryField` fields and
unselected choices of `~lsst.pex.config.ConfigChoiceField` fields
are not considered by this method.

Floating point comparisons are performed by `numpy.allclose`.

Definition at line 1402 of file config.py.

    def compare(self, other, shortcut=True, rtol=1E-8, atol=1E-8, output=None):
        """Compare this configuration to another `~lsst.pex.config.Config` for
        equality.
 
        Parameters
        ----------
        other : `lsst.pex.config.Config`
            Other `~lsst.pex.config.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.
 
        See also
        --------
        lsst.pex.config.compareConfigs
 
        Notes
        -----
        Unselected targets of `~lsst.pex.config.RegistryField` fields and
        unselected choices of `~lsst.pex.config.ConfigChoiceField` fields
        are not considered by this method.
 
        Floating point comparisons are performed by `numpy.allclose`.
        """
        name1 = self._name if self._name is not None else "config"
        name2 = other._name if other._name is not None else "config"
        name = getComparisonName(name1, name2)
        return compareConfigs(name, self, other, shortcut=shortcut,
                              rtol=rtol, atol=atol, output=output)
 

formatHistory()

def lsst.pex.config.config.Config.formatHistory	(		self,
			name,
		**	kwargs
	)

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

Parameters
----------
name : `str`
    Name of a `~lsst.pex.config.Field` in this config.
kwargs
    Keyword arguments passed to `lsst.pex.config.history.format`.

Returns
-------
history : `str`
    A string containing the formatted history.

See also
--------
lsst.pex.config.history.format

Definition at line 1311 of file config.py.

    def formatHistory(self, name, **kwargs):
        """Format a configuration field's history to a human-readable format.
 
        Parameters
        ----------
        name : `str`
            Name of a `~lsst.pex.config.Field` in this config.
        kwargs
            Keyword arguments passed to `lsst.pex.config.history.format`.
 
        Returns
        -------
        history : `str`
            A string containing the formatted history.
 
        See also
        --------
        lsst.pex.config.history.format
        """
        import lsst.pex.config.history as pexHist
        return pexHist.format(self, name, **kwargs)
 

freeze()

def lsst.pex.config.config.Config.freeze

(

self

)

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

Definition at line 1177 of file config.py.

    def freeze(self):
        """Make this config, and all subconfigs, read-only.
        """
        self._frozen = True
        for field in self._fields.values():
            field.freeze(self)
 

items()

def lsst.pex.config.config.Config.items

(

self

)

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

Returns
-------
items : `list`
    List of tuples for each configuration. Tuple items are:

    0. Field name.
    1. Field value.

See also
--------
lsst.pex.config.Config.iteritems

Definition at line 824 of file config.py.

    def items(self):
        """Get configurations as ``(field name, field value)`` pairs.
 
        Returns
        -------
        items : `list`
            List of tuples for each configuration. Tuple items are:
 
            0. Field name.
            1. Field value.
 
        See also
        --------
        lsst.pex.config.Config.iteritems
        """
        return list(self._storage.items())
 

iteritems()

def lsst.pex.config.config.Config.iteritems

(

self

)

Iterate over (field name, field value) pairs.

Yields
------
item : `tuple`
    Tuple items are:

    0. Field name.
    1. Field value.

See also
--------
lsst.pex.config.Config.items

Definition at line 841 of file config.py.

    def iteritems(self):
        """Iterate over (field name, field value) pairs.
 
        Yields
        ------
        item : `tuple`
            Tuple items are:
 
            0. Field name.
            1. Field value.
 
        See also
        --------
        lsst.pex.config.Config.items
        """
        return iter(self._storage.items())
 

iterkeys()

def lsst.pex.config.config.Config.iterkeys

(

self

)

Iterate over field names

Yields
------
key : `str`
    A field's key (attribute name).

See also
--------
lsst.pex.config.Config.values

Definition at line 872 of file config.py.

    def iterkeys(self):
        """Iterate over field names
 
        Yields
        ------
        key : `str`
            A field's key (attribute name).
 
        See also
        --------
        lsst.pex.config.Config.values
        """
        return iter(self.storage.keys())
 

itervalues()

def lsst.pex.config.config.Config.itervalues

(

self

)

Iterate over field values.

Yields
------
value : obj
    A field value.

See also
--------
lsst.pex.config.Config.values

Definition at line 858 of file config.py.

    def itervalues(self):
        """Iterate over field values.
 
        Yields
        ------
        value : obj
            A field value.
 
        See also
        --------
        lsst.pex.config.Config.values
        """
        return iter(self.storage.values())
 

keys()

def lsst.pex.config.config.Config.keys

(

self

)

Get field names.

Returns
-------
names : `list`
    List of `lsst.pex.config.Field` names.

See also
--------
lsst.pex.config.Config.iterkeys

Definition at line 796 of file config.py.

    def keys(self):
        """Get field names.
 
        Returns
        -------
        names : `list`
            List of `lsst.pex.config.Field` names.
 
        See also
        --------
        lsst.pex.config.Config.iterkeys
        """
        return list(self._storage.keys())
 

load()

def lsst.pex.config.config.Config.load	(		self,
			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

Definition at line 1012 of file config.py.

    def load(self, 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
        """
        with open(filename, "r") as f:
            code = compile(f.read(), filename=filename, mode="exec")
            self.loadFromStream(stream=code, root=root, filename=filename)
 

loadFromStream()

def lsst.pex.config.config.Config.loadFromStream	(		self,
			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

Definition at line 1047 of file config.py.

    def loadFromStream(self, 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
        """
        with RecordingImporter() as importer:
            globals = {"__file__": filename}
            try:
                local = {root: self}
                exec(stream, globals, local)
            except NameError as e:
                if root == "config" and "root" in e.args[0]:
                    if filename is None:
                        # try to determine the file name; a compiled string
                        # has attribute "co_filename",
                        # an open file has attribute "name", else give up
                        filename = getattr(stream, "co_filename", None)
                        if filename is None:
                            filename = getattr(stream, "name", "?")
                    print(f"Config override file {filename!r}"
                          " appears to use 'root' instead of 'config'; trying with 'root'", file=sys.stderr)
                    local = {"root": self}
                    exec(stream, globals, local)
                else:
                    raise
 
        self._imports.update(importer.getModules())
 

names()

def lsst.pex.config.config.Config.names

(

self

)

Get all the field names in the config, recursively.

Returns
-------
names : `list` of `str`
    Field names.

Definition at line 1232 of file config.py.

    def names(self):
        """Get all the field names in the config, recursively.
 
        Returns
        -------
        names : `list` of `str`
            Field names.
        """
        #
        # Rather than sort out the recursion all over again use the
        # pre-existing saveToStream()
        #
        with io.StringIO() as strFd:
            self.saveToStream(strFd, "config")
            contents = strFd.getvalue()
            strFd.close()
        #
        # Pull the names out of the dumped config
        #
        keys = []
        for line in contents.split("\n"):
            if re.search(r"^((assert|import)\s+|\s*$|#)", line):
                continue
 
            mat = re.search(r"^(?:config\.)?([^=]+)\s*=\s*.*", line)
            if mat:
                keys.append(mat.group(1))
 
        return keys
 

save()

def lsst.pex.config.config.Config.save	(		self,
			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`).

See also
--------
lsst.pex.config.Config.saveToStream
lsst.pex.config.Config.load
lsst.pex.config.Config.loadFromStream

Definition at line 1103 of file config.py.

    def save(self, 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`).
 
        See also
        --------
        lsst.pex.config.Config.saveToStream
        lsst.pex.config.Config.load
        lsst.pex.config.Config.loadFromStream
        """
        d = os.path.dirname(filename)
        with tempfile.NamedTemporaryFile(mode="w", delete=False, dir=d) as outfile:
            self.saveToStream(outfile, root)
            # tempfile is hardcoded to create files with mode '0600'
            # for an explantion of these antics see:
            # https://stackoverflow.com/questions/10291131/how-to-use-os-umask-in-python
            umask = os.umask(0o077)
            os.umask(umask)
            os.chmod(outfile.name, (~umask & 0o666))
            # chmod before the move so we get quasi-atomic behavior if the
            # source and dest. are on the same filesystem.
            # os.rename may not work across filesystems
            shutil.move(outfile.name, filename)
 

saveToStream()

def lsst.pex.config.config.Config.saveToStream	(		self,
			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.

See also
--------
lsst.pex.config.Config.save
lsst.pex.config.Config.load
lsst.pex.config.Config.loadFromStream

Definition at line 1135 of file config.py.

    def saveToStream(self, 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.
 
        See also
        --------
        lsst.pex.config.Config.save
        lsst.pex.config.Config.load
        lsst.pex.config.Config.loadFromStream
        """
        tmp = self._name
        self._rename(root)
        try:
            if not skipImports:
                self._collectImports()
                # Remove self from the set, as it is handled explicitly below
                self._imports.remove(self.__module__)
                configType = type(self)
                typeString = _typeStr(configType)
                outfile.write(f"import {configType.__module__}\n")
                outfile.write(f"assert type({root})=={typeString}, 'config is of type %s.%s instead of "
                              f"{typeString}' % (type({root}).__module__, type({root}).__name__)\n")
                for imp in self._imports:
                    if imp in sys.modules and sys.modules[imp] is not None:
                        outfile.write(u"import {}\n".format(imp))
            self._save(outfile)
        finally:
            self._rename(tmp)
 

setDefaults()

def lsst.pex.config.config.Config.setDefaults

(

self

)

Subclass hook for computing defaults.

Notes
-----
Derived `~lsst.pex.config.Config` classes that must compute defaults
rather than using the `~lsst.pex.config.Field` instances's defaults
should do so here. To correctly use inherited defaults,
implementations of ``setDefaults`` must call their base class's
``setDefaults``.

Reimplemented in lsst.pipe.tasks.scaleVariance.ScaleVarianceConfig, lsst.pipe.tasks.mocks.mockCoadd.MockCoaddConfig, lsst.pipe.tasks.ingestCuratedCalibs.IngestCuratedCalibsConfig, lsst.pipe.tasks.dataFrameActions._actions.NanoJansky, lsst.pipe.drivers.multiBandDriver.MultiBandDriverConfig, lsst.pipe.drivers.constructCalibs.FringeConfig, lsst.pipe.drivers.constructCalibs.DarkConfig, lsst.pipe.drivers.constructCalibs.CalibConfig, lsst.pipe.drivers.coaddDriver.CoaddDriverConfig, lsst.pipe.drivers.background.MaskObjectsConfig, lsst.meas.modelfit.psf.psfContinued.GeneralShapeletPsfApproxForcedConfig, lsst.meas.modelfit.psf.psfContinued.GeneralShapeletPsfApproxSingleFrameConfig, lsst.meas.modelfit.cmodel.cmodelContinued.CModelForcedConfig, lsst.meas.modelfit.cmodel.cmodelContinued.CModelSingleFrameConfig, lsst.meas.base.forcedMeasurement.ForcedMeasurementConfig, and lsst.ip.diffim.dipoleMeasurement.DipoleMeasurementConfig.

Definition at line 939 of file config.py.

    def setDefaults(self):
        """Subclass hook for computing defaults.
 
        Notes
        -----
        Derived `~lsst.pex.config.Config` classes that must compute defaults
        rather than using the `~lsst.pex.config.Field` instances's defaults
        should do so here. To correctly use inherited defaults,
        implementations of ``setDefaults`` must call their base class's
        ``setDefaults``.
        """
        pass
 

toDict()

def lsst.pex.config.config.Config.toDict

(

self

)

Make a dictionary of field names and their values.

Returns
-------
dict_ : `dict`
    Dictionary with keys that are `~lsst.pex.config.Field` names.
    Values are `~lsst.pex.config.Field` values.

See also
--------
lsst.pex.config.Field.toDict

Notes
-----
This method uses the `~lsst.pex.config.Field.toDict` method of
individual fields. Subclasses of `~lsst.pex.config.Field` may need to
implement a ``toDict`` method for *this* method to work.

Definition at line 1208 of file config.py.

    def toDict(self):
        """Make a dictionary of field names and their values.
 
        Returns
        -------
        dict_ : `dict`
            Dictionary with keys that are `~lsst.pex.config.Field` names.
            Values are `~lsst.pex.config.Field` values.
 
        See also
        --------
        lsst.pex.config.Field.toDict
 
        Notes
        -----
        This method uses the `~lsst.pex.config.Field.toDict` method of
        individual fields. Subclasses of `~lsst.pex.config.Field` may need to
        implement a ``toDict`` method for *this* method to work.
        """
        dict_ = {}
        for name, field in self._fields.items():
            dict_[name] = field.toDict(self)
        return dict_
 

update()

def lsst.pex.config.config.Config.update	(		self,
		**	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 `~lsst.pex.config.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!'

Definition at line 952 of file config.py.

    def update(self, **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 `~lsst.pex.config.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!'
        """
        at = kw.pop("__at", getCallStack())
        label = kw.pop("__label", "update")
 
        for name, value in kw.items():
            try:
                field = self._fields[name]
                field.__set__(self, value, at=at, label=label)
            except KeyError:
                raise KeyError("No field of name %s exists in config type %s" % (name, _typeStr(self)))
 

validate()

def lsst.pex.config.config.Config.validate

(

self

)

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 `~lsst.pex.config.Field.validate` methods.

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

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

Reimplemented in lsst.pipe.drivers.multiBandDriver.MultiBandDriverConfig, lsst.pipe.drivers.coaddDriver.CoaddDriverConfig, lsst.pipe.drivers.background.MaskObjectsConfig, lsst.meas.base.baseMeasurement.BaseMeasurementConfig, lsst.meas.algorithms.measureApCorr.MeasureApCorrConfig, lsst.meas.algorithms.gaussianPsfFactory.GaussianPsfFactory, lsst.fgcmcal.sedterms.Sedterm, lsst.dax.apdb.apdbSql.ApdbSqlConfig, and lsst.afw.geom.transformConfig.RadialTransformConfig.

Definition at line 1285 of file config.py.

    def validate(self):
        """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 `~lsst.pex.config.Field.validate` methods.
 
        Complex single-field validation can be defined by deriving new Field
        types. For convenience, some derived `lsst.pex.config.Field`-types
        (`~lsst.pex.config.ConfigField` and
        `~lsst.pex.config.ConfigChoiceField`) are defined in `lsst.pex.config`
        that handle recursing into subconfigs.
 
        Inter-field relationships should only be checked in derived
        `~lsst.pex.config.Config` classes after calling this method, and base
        validation is complete.
        """
        for field in self._fields.values():
            field.validate(self)
 

values()

def lsst.pex.config.config.Config.values

(

self

)

Get field values.

Returns
-------
values : `list`
    List of field values.

See also
--------
lsst.pex.config.Config.itervalues

Definition at line 810 of file config.py.

    def values(self):
        """Get field values.
 
        Returns
        -------
        values : `list`
            List of field values.
 
        See also
        --------
        lsst.pex.config.Config.itervalues
        """
        return list(self._storage.values())
 

Property Documentation

history

lsst.pex.config.config.Config.history = property(lambda x: x._history)

static

Definition at line 1333 of file config.py.

---

The documentation for this class was generated from the following file:

• /j/snowflake/release/lsstsw/stack/lsst-scipipe-0.7.0/Linux64/pex_config/22.0.1-2-gd1925c9+bf4f0e694f/python/lsst/pex/config/config.py