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Title:
dataclass decorator is broken in 1.7 · Issue #2042 · pydantic/pydantic
Description:
Checks I added a descriptive title to this issue I have searched (google, github) for similar issues and couldn't find anything I have read and followed the docs and still think this is a bug B...
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/users/kittipat/pydantic_test/lib/python3 /usr/bin/env python3 c4e825a samuelcolvin closed comment metadata assignees 471fc74 prettywood mentioned similar issues possibly related pydantic v1 verified 0b9cd4e sign dataclasses import field import pydantic docs pydantic dataclass stdlib dataclass dataclass inheritance pydantic/dataclasses pydantic dataclasses pydantic version stdlib dataclasses added descriptive title minimal repro recent call projects milestone milestone relationships default_factory=lambda def main type projects issue python vanilla_dataclass dataclass github pydantic dataclasses version 1 file fix = field sign main type skip jump broken searched google find read utils
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context:https://schema.org
headline:dataclass decorator is broken in 1.7
articleBody:### Checks
* [x] I added a descriptive title to this issue
* [x] I have searched (google, github) for similar issues and couldn't find anything
* [x] I have read and followed [the docs](https://pydantic-docs.helpmanual.io/) and still think this is a bug
<!-- Sorry to sound so draconian, but every second saved replying to issues is time spend improving pydantic :-) -->
# Bug
Output of `python -c "import pydantic.utils; print(pydantic.utils.version_info())"`:
```
pydantic version: 1.7
pydantic compiled: True
install path: /Users/kittipat/pydantic_test/lib/python3.7/site-packages/pydantic
python version: 3.7.9 (default, Sep 30 2020, 11:16:22) [Clang 11.0.0 (clang-1100.0.33.17)]
platform: Darwin-19.6.0-x86_64-i386-64bit
optional deps. installed: []
```
<!-- or if you're using pydantic prior to v1.3, manually include: OS, python version and pydantic version -->
<!-- Please read the [docs](https://pydantic-docs.helpmanual.io/) and search through issues to
confirm your bug hasn't already been reported. -->
<!-- Where possible please include a self-contained code snippet describing your bug: -->
Prior to version 1.7, it was possible to subclass from stdlib dataclass. In version 1.7, doing so will result in error. Here is a minimal repro.
```py
#!/usr/bin/env python3
from dataclasses import field, dataclass as vanilla_dataclass
from pydantic.dataclasses import dataclass
@vanilla_dataclass
class X:
y: int = 0
@dataclass
class A(X):
x: int = 1
@dataclass
class B:
a: A = field(default_factory=lambda: A(x=2, y=3))
def main():
print(B(**{"a": {"x": "4", "y": "5"}}))
if __name__ == "__main__":
main()
```
Running with version 1.6
```
B(a=A(y=5, x=4))
```
Running with version 1.7
```
Traceback (most recent call last):
File "dataclass.py", line 15, in <module>
@dataclass
File "pydantic/dataclasses.py", line 214, in pydantic.dataclasses.dataclass
# name and type are filled in after the fact, not in __init__.
File "pydantic/dataclasses.py", line 209, in pydantic.dataclasses.dataclass.wrap
File "pydantic/dataclasses.py", line 138, in pydantic.dataclasses._process_class
# +-------+-------+-------+--------+--------+
File "dataclass.py", line 17, in <lambda>
a: A = field(default_factory=lambda: A(x=2, y=3))
TypeError: __init__() got an unexpected keyword argument 'x'
```
author:
url:https://github.com/kittipatv
type:Person
name:kittipatv
datePublished:2020-10-26T22:03:43.000Z
interactionStatistic:
type:InteractionCounter
interactionType:https://schema.org/CommentAction
userInteractionCount:1
url:https://github.com/2042/pydantic/issues/2042
context:https://schema.org
headline:dataclass decorator is broken in 1.7
articleBody:### Checks
* [x] I added a descriptive title to this issue
* [x] I have searched (google, github) for similar issues and couldn't find anything
* [x] I have read and followed [the docs](https://pydantic-docs.helpmanual.io/) and still think this is a bug
<!-- Sorry to sound so draconian, but every second saved replying to issues is time spend improving pydantic :-) -->
# Bug
Output of `python -c "import pydantic.utils; print(pydantic.utils.version_info())"`:
```
pydantic version: 1.7
pydantic compiled: True
install path: /Users/kittipat/pydantic_test/lib/python3.7/site-packages/pydantic
python version: 3.7.9 (default, Sep 30 2020, 11:16:22) [Clang 11.0.0 (clang-1100.0.33.17)]
platform: Darwin-19.6.0-x86_64-i386-64bit
optional deps. installed: []
```
<!-- or if you're using pydantic prior to v1.3, manually include: OS, python version and pydantic version -->
<!-- Please read the [docs](https://pydantic-docs.helpmanual.io/) and search through issues to
confirm your bug hasn't already been reported. -->
<!-- Where possible please include a self-contained code snippet describing your bug: -->
Prior to version 1.7, it was possible to subclass from stdlib dataclass. In version 1.7, doing so will result in error. Here is a minimal repro.
```py
#!/usr/bin/env python3
from dataclasses import field, dataclass as vanilla_dataclass
from pydantic.dataclasses import dataclass
@vanilla_dataclass
class X:
y: int = 0
@dataclass
class A(X):
x: int = 1
@dataclass
class B:
a: A = field(default_factory=lambda: A(x=2, y=3))
def main():
print(B(**{"a": {"x": "4", "y": "5"}}))
if __name__ == "__main__":
main()
```
Running with version 1.6
```
B(a=A(y=5, x=4))
```
Running with version 1.7
```
Traceback (most recent call last):
File "dataclass.py", line 15, in <module>
@dataclass
File "pydantic/dataclasses.py", line 214, in pydantic.dataclasses.dataclass
# name and type are filled in after the fact, not in __init__.
File "pydantic/dataclasses.py", line 209, in pydantic.dataclasses.dataclass.wrap
File "pydantic/dataclasses.py", line 138, in pydantic.dataclasses._process_class
# +-------+-------+-------+--------+--------+
File "dataclass.py", line 17, in <lambda>
a: A = field(default_factory=lambda: A(x=2, y=3))
TypeError: __init__() got an unexpected keyword argument 'x'
```
author:
url:https://github.com/kittipatv
type:Person
name:kittipatv
datePublished:2020-10-26T22:03:43.000Z
interactionStatistic:
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interactionType:https://schema.org/CommentAction
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url:https://github.com/2042/pydantic/issues/2042
Person:
url:https://github.com/kittipatv
name:kittipatv
url:https://github.com/kittipatv
name:kittipatv
InteractionCounter:
interactionType:https://schema.org/CommentAction
userInteractionCount:1
interactionType:https://schema.org/CommentAction
userInteractionCount:1
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