MutableGenericMap

class lsst.afw.typehandling.MutableGenericMap(*args, **kwds)

Bases: GenericMap

An abstract MutableMapping for use when sharing a map between C++ and Python.

For compatibility with C++, MutableGenericMap has the following restrictions:

• all keys must be of the same type

• values must be built-in types or subclasses of lsst.afw.typehandling.Storable. Almost any user-defined class in C++ or Python can have Storable as a mixin.

As a safety precaution, Storable objects that are added from C++ may be copied when you retrieve them from Python, making it impossible to modify them in-place. This issue does not affect objects that are added from Python, or objects that are always passed by shared_ptr in C++.

Notes

Key-type specializations of MutableGenericMap are available as, e.g., MutableGenericMap[str].

Attributes Summary

TEMPLATE_DEFAULTS
TEMPLATE_PARAMS

Methods Summary

items()
keys()
pop(key[, default])
setdefault(k[,d])
update([E, ]**F)	If E present and has a .keys() method, does: for k in E: D[k] = E[k] If E present and lacks .keys() method, does: for (k, v) in E: D[k] = v In either case, this is followed by: for k, v in F.items(): D[k] = v
values()

Attributes Documentation

TEMPLATE_DEFAULTS = (None,)

TEMPLATE_PARAMS = ('dtype',)

Methods Documentation

items() → a set-like object providing a view on D's items

keys() → a set-like object providing a view on D's keys

pop(key, default=None)

setdefault(k[, d]) → D.get(k,d), also set D[k]=d if k not in D

update([E, ]**F) → None.  Update D from mapping/iterable E and F.

If E present and has a .keys() method, does: for k in E: D[k] = E[k] If E present and lacks .keys() method, does: for (k, v) in E: D[k] = v In either case, this is followed by: for k, v in F.items(): D[k] = v

values() → an object providing a view on D's values