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koaning/maybe.py

Last active November 29, 2025 19:53
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maybe.py
class Maybe:
def __init__(self, obj):
self._obj = obj
def __getattr__(self, name):
if self._obj is None:
return Maybe(None)
try:
result = getattr(self._obj, name)
return Maybe(result)
except AttributeError:
return Maybe(None)
def __bool__(self):
return self._obj is not None
def __repr__(self):
return "Maybe()"
def collect(self):
return self._obj
class User:
def __init__(self, name, email):
self.name = name
self.email = email
user = User("John Doe", "[email protected]")
if Maybe(user).foo:
print("bar")
@ateshakan
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ateshakan commented Nov 28, 2025

that is such an elegant way to approach optional chaining. we use pydantic to handle cases but still not that clean and elegant since you need use a walrus operator to make linter happy.

# sth like
if (article := research.article_gathered) and (attachment := article.attachment):
    print(attachment.attachment_id)
else:
...

Apparently the ?. operator was actually proposed (PEP 505) and rejected multiple times.

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