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def | __init__ (self, doc, keytype, itemtype, default=None, optional=False, dictCheck=None, itemCheck=None, deprecated=None) |
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def | validate (self, instance) |
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def | __set__ (self, instance, value, at=None, label="assignment") |
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def | toDict (self, instance) |
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def | rename (self, instance) |
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def | freeze (self, instance) |
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def | save (self, outfile, instance) |
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def | __get__ (self, instance, owner=None, at=None, label="default") |
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def | __delete__ (self, instance, at=None, label='deletion') |
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A configuration field (`~lsst.pex.config.Field` subclass) that maps keys
and values.
The types of both items and keys are restricted to these builtin types:
`int`, `float`, `complex`, `bool`, and `str`). All keys share the same type
and all values share the same type. Keys can have a different type from
values.
Parameters
----------
doc : `str`
A documentation string that describes the configuration field.
keytype : {`int`, `float`, `complex`, `bool`, `str`}
The type of the mapping keys. All keys must have this type.
itemtype : {`int`, `float`, `complex`, `bool`, `str`}
Type of the mapping values.
default : `dict`, optional
The default mapping.
optional : `bool`, optional
If `True`, the field doesn't need to have a set value.
dictCheck : callable
A function that validates the dictionary as a whole.
itemCheck : callable
A function that validates individual mapping values.
deprecated : None or `str`, optional
A description of why this Field is deprecated, including removal date.
If not None, the string is appended to the docstring for this Field.
See also
--------
ChoiceField
ConfigChoiceField
ConfigDictField
ConfigField
ConfigurableField
Field
ListField
RangeField
RegistryField
Examples
--------
This field maps has `str` keys and `int` values:
>>> from lsst.pex.config import Config, DictField
>>> class MyConfig(Config):
... field = DictField(
... doc="Example string-to-int mapping field.",
... keytype=str, itemtype=int,
... default={})
...
>>> config = MyConfig()
>>> config.field['myKey'] = 42
>>> print(config.field)
{'myKey': 42}
def lsst.pex.config.dictField.DictField.__set__ |
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self, |
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instance, |
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value, |
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at = None , |
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label = "assignment" |
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) |
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Set an attribute on the config instance.
Parameters
----------
instance : `lsst.pex.config.Config`
The config instance that contains this field.
value : obj
Value to set on this field.
at : `list` of `lsst.pex.config.callStack.StackFrame`
The call stack (created by
`lsst.pex.config.callStack.getCallStack`).
label : `str`, optional
Event label for the history.
Notes
-----
This method is invoked by the owning `lsst.pex.config.Config` object
and should not be called directly.
Derived `~lsst.pex.config.Field` classes may need to override the
behavior. When overriding ``__set__``, `~lsst.pex.config.Field` authors
should follow the following rules:
- Do not allow modification of frozen configs.
- Validate the new value **before** modifying the field. Except if the
new value is `None`. `None` is special and no attempt should be made
to validate it until `lsst.pex.config.Config.validate` is called.
- Do not modify the `~lsst.pex.config.Config` instance to contain
invalid values.
- If the field is modified, update the history of the
`lsst.pex.config.field.Field` to reflect the changes.
In order to decrease the need to implement this method in derived
`~lsst.pex.config.Field` types, value validation is performed in the
`lsst.pex.config.Field._validateValue`. If only the validation step
differs in the derived `~lsst.pex.config.Field`, it is simpler to
implement `lsst.pex.config.Field._validateValue` than to reimplement
``__set__``. More complicated behavior, however, may require
reimplementation.
Reimplemented from lsst.pex.config.config.Field.