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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 classes? I've tried looking in the python source but found it a bit bewildering.
530
Dictionary Merge & Update OperatorsMerge ( | ) and update ( |= ) operators have been added to the built-in dict class.
__gt__(y) to obtain a return value when comparing two objects using x > y . The return value can be any data type because any value can automatically converted to a Boolean by using the bool() built-in function. If the __gt__() method is not defined, Python will raise a TypeError .
__sub__(self, other) method returns a new object that represents the difference of two objects. It implements the subtraction operator - in Python. We call this a “Dunder Method” for “Double Underscore Method” (also called “magic method”).
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.
56
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
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.
2
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