Is there a __dunder__ method corresponding to |= (pipe equal/update) for dicts in python 3.9?

Question

In python 3.9, dictionaries gained combine | and update |= operators. Is there a dunder/magic method which will enable this to be used for other cl

Answer 1

Yes, the method for | is __or__ and the method for |= is __ior__. You can see an (approximate) Python implementation here in PEP 584.

def __or__(self, other):
    if not isinstance(other, dict):
        return NotImplemented
    new = dict(self)
    new.update(other)
    return new

def __ior__(self, other):
    dict.update(self, other)
    return self

Answer 2

No need to dig through the source. It's clearly documented as __or__ and __ior__. https://docs.python.org/3/reference/datamodel.html is the relevant documentation.

Answer 3

Yes, | and |= correspond to __or__ and __ior__.

Don't look at the python source code, look at the documentation. In particular, the data model.

See here

And note, this isn't specific to python 3.9.