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bpo-37163: Make the obj argument of dataclasses.replace() a positional-only. (GH-14390)

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Serhiy Storchaka 2019-06-26 19:07:44 +03:00 • committed by GitHub
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commit 2d88e63bfc
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3 changed files with 3 additions and 2 deletions
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Doc/library/dataclasses.rst
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@ -356,7 +356,7 @@ Module-level decorators, classes, and functions
def add_one(self): def add_one(self):
return self.x + 1 return self.x + 1
.. function:: replace(instance, **changes) .. function:: replace(instance, /, **changes)
Creates a new object of the same type of ``instance``, replacing Creates a new object of the same type of ``instance``, replacing
fields with values from ``changes``. If ``instance`` is not a Data fields with values from ``changes``. If ``instance`` is not a Data

2
Lib/dataclasses.py
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@ -1206,7 +1206,7 @@ class C(Base):
unsafe_hash=unsafe_hash, frozen=frozen) unsafe_hash=unsafe_hash, frozen=frozen)
def replace(obj, **changes): def replace(obj, /, **changes):
"""Return a new object replacing specified fields with new values. """Return a new object replacing specified fields with new values.
This is especially useful for frozen classes. Example usage: This is especially useful for frozen classes. Example usage:

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Misc/NEWS.d/next/Library/2019-06-19-10-35-53.bpo-37163.9pPg2F.rst Normal file
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@ -0,0 +1 @@
The *obj* argument of :func:`dataclasses.replace` is positional-only now.