v2.7.0 Validation error if integer field is filled with string "00"

[nico00]

Initial Checks

• I confirm that I'm using Pydantic V2

Description

This seems to be a regression as v.2.6.4 was not affected by this problem.

Basically if you define a model with an integer field and fill it with string "00", you get the following error message:

pydantic_core._pydantic_core.ValidationError: 1 validation error for MyModel
id
  Input should be a valid integer, unable to parse string as an integer [type=int_parsing, input_value='00', input_type=str]
    For further information visit https://errors.pydantic.dev/2.7/v/int_parsing

The problem seems only to happen with multiple zeros (i.e. "00", "000", ...), other numeric strings work properly (e.g. "01", "0").

Example Code

from pydantic import BaseModel

class User(BaseModel):
    id: int = 0

s = User(id="01") # works
print(s)  

s = User(id="00") # fails
print(s)

Python, Pydantic & OS Version

pydantic version: 2.7.0
pydantic-core version: 2.18.1

[sydney-runkle]

@nico00,

Thanks for reporting this. @samuelcolvin, could you please take a look? I think this is likely related to the int parsing changes you worked on recently...

[samuelcolvin]

Yup, good catch, I'll fix over the weekend.

Sorry for the trouble.

[samuelcolvin]

should be fixed in pydantic/pydantic-core#1269.

[sydney-runkle]

Thanks @samuelcolvin for the quick turnaround!

We'll release this fix in a patch release early next week 👍