# uproot.class_named

Defined in [uproot.model](https://github.com/scikit-hep/uproot5/blob/db953cf9827349b3d24eb6742404158c1dfd5481/src/uproot/model.py) on [line 257](https://github.com/scikit-hep/uproot5/blob/db953cf9827349b3d24eb6742404158c1dfd5481/src/uproot/model.py#L257).

### uproot.model.class_named(classname, version=None, custom_classes=None)

Returns a class with a given C++ (decoded) classname.

If `version` is None, no attempt is made to find a specific version.

* If the class is a [uproot.model.DispatchByVersion](uproot.model.DispatchByVersion.html.md), then this is
  object returned.
* If the class is a versionless model, then this is the object returned.

If `version` is an integer, an attempt is made to find the specific
version.

* If the class is a [uproot.model.DispatchByVersion](uproot.model.DispatchByVersion.html.md), then it is
  queried for a versioned model.
* If the class is a versionless model, then this is the object returned.

If `custom_classes` are provided, then these are searched (exclusively)
for the class. If `custom_classes` is None, then `uproot.classes` is
used.

No classes are created if a class is not found (an error is raised).