mirrors/cpython
1
0
Fork 0
mirror of https://github.com/python/cpython.git synced 2025-08-04 00:48:58 +00:00
Code Issues Projects Releases Packages Wiki Activity Actions 8

bpo-33569 Preserve type information with dataclasses.InitVar (GH-8927)

Browse source
This commit is contained in:
Augusto Hack 2019-06-02 23:14:48 -03:00 • committed by Eric V. Smith
parent 0025350294
commit 01ee12ba35
3 changed files with 17 additions and 3 deletions
Download patch file Download diff file Expand all files Collapse all files

13
Lib/dataclasses.py
View file

@ -201,10 +201,16 @@ _MODULE_IDENTIFIER_RE = re.compile(r'^(?:\s*(\w+)\s*\.)?\s*(\w+)')
class _InitVarMeta(type):
def __getitem__(self, params):
return self
return InitVar(params)
class InitVar(metaclass=_InitVarMeta):
pass
__slots__ = ('type', )
def __init__(self, type):
self.type = type
def __repr__(self):
return f'dataclasses.InitVar[{self.type.__name__}]'
# Instances of Field are only ever created from within this module,
@ -586,7 +592,8 @@ def _is_classvar(a_type, typing):
def _is_initvar(a_type, dataclasses):
# The module we're checking against is the module we're
# currently in (dataclasses.py).
return a_type is dataclasses.InitVar
return (a_type is dataclasses.InitVar
or type(a_type) is dataclasses.InitVar)
def _is_type(annotation, cls, a_module, a_type, is_type_predicate):