Describe the bug
When using flag use_union_operator=True and specific field names (e.g. float), that are not required, Pydantic typing fails and the generated model can not be used. Setting use_union_operator to False works as expected.
To Reproduce
Example schema:
openapi: 3.1.0
paths: {}
components:
schemas:
ReservedProperty:
type: object
properties:
float:
type: number
format: floatUsed commandline:
$ datamodel-codegen --input <path to the file above>
The command above generates the following content:
from __future__ import annotations
from pydantic import BaseModel
class ReservedProperty(BaseModel):
float: float | None = NoneWhen trying to instantiate the class (a = ReservedProperty()), I get the following error:
TypeError: unsupported operand type(s) for |: 'NoneType' and 'NoneType'
It appears that field name float clashes with float type.
Expected behavior
I expect the generated file to be usable within Python without any errors.
Version:
- OS: macOS Tahoe 26.1
- Python version: 3.13.5
- datamodel-code-generator version: 0.52.2
Additional context
Describe the bug
When using flag
use_union_operator=Trueand specific field names (e.g.float), that are not required, Pydantic typing fails and the generated model can not be used. Settinguse_union_operatortoFalseworks as expected.To Reproduce
Example schema:
Used commandline:
The command above generates the following content:
When trying to instantiate the class (
a = ReservedProperty()), I get the following error:It appears that field name
floatclashes withfloattype.Expected behavior
I expect the generated file to be usable within Python without any errors.
Version:
Additional context