Remove mutable default arg in function example (#944)

* Remove mutable default arg in function example Removed mutable default arg, replaced with `None`. https://docs.quantifiedcode.com/python-anti-patterns/correctness/mutable_default_value_as_argument.html Replaced `dict()` with `{}`. https://stackoverflow.com/questions/8424942/creating-a-new-dictionary-in-python * Wrong import * Undo last commit My bad. Co-authored-by: Hynek Schlawack <[email protected]>
python-attrs · Apr 7, 2022 · 2afbcb2 · 2afbcb2
1 parent f376db2
commit 2afbcb2
Showing 1 changed file with 2 additions and 2 deletions.
diff --git a/docs/extending.rst b/docs/extending.rst
@@ -176,10 +176,10 @@ Here are some tips for effective use of metadata:
     >>>
     >>> def typed(
     ...     cls, default=NOTHING, validator=None, repr=True,
-    ...     eq=True, order=None, hash=None, init=True, metadata={},
+    ...     eq=True, order=None, hash=None, init=True, metadata=None,
     ...     converter=None
     ... ):
-    ...     metadata = dict() if not metadata else metadata
+    ...     metadata = metadata or {}
     ...     metadata[MY_TYPE_METADATA] = cls
     ...     return field(
     ...         default=default, validator=validator, repr=repr,