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Use chain.from_iterable in class_validators.py (#1642)

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* Use chain.from_iterable in class_validators.py

* fix change

Co-authored-by: Samuel Colvin <s@muelcolvin.com>
This commit is contained in:
Ram Rachum
2020-06-27 20:43:28 +03:00
committed by GitHub
parent 5a2d78765a
commit ecb54c5d36
2 changed files with 6 additions and 5 deletions
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changes/1642-cool-RR.txt
+3
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@@ -0,0 +1,3 @@
Use `chain.from_iterable` in class_validators.py. This is a faster and more idiomatic way of using `itertools.chain`.
Instead of computing all the items in the iterable and storing them in memory, they are computed one-by-one and never
stored as a huge list. This can save on both runtime and memory space.
pydantic/class_validators.py
+3 -5
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@@ -164,11 +164,9 @@ class ValidatorGroup:
def check_for_unused(self) -> None:
unused_validators = set(
chain(
*[
(v.func.__name__ for v in self.validators[f] if v.check_fields)
for f in (self.validators.keys() - self.used_validators)
]
chain.from_iterable(
(v.func.__name__ for v in self.validators[f] if v.check_fields)
for f in (self.validators.keys() - self.used_validators)
)
)
if unused_validators: