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bug: `flet test` fails with `ModuleNotFoundError: No module named 'pydantic_core._pydantic_core'`

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@ndonkoHenri 已经在做这个了。

开始于 2026年10月28日。

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描述

bug
Discussed in https://github.com/flet-dev/flet/discussions/7020

Originally posted by jules-baratoux October 28, 2026

Question

Hi,

I'm trying to run flet test, but the app fails to render not able to import Pydantic:

image

I'm not sure what I'm doing wrong. Is there something else I need to configure to make flet test work correctly on Windows when depending on pydantic?

Any help would be appreciated. Thanks!

Configuration

I tried adding the following configuration to my pyproject.toml, but it didn't solve the issue even after a prior flet clean:

[[tool.uv.index]]
name = "flet"
url = "https://pypi.flet.dev"
explicit = true

[tool.uv.sources]
pydantic-core = { index = "flet" }
Error message
File ".../site-packages/pydantic/version.py", line 7, in <module>
File ".../site-packages/pydantic_core/__init__.py", line 8, in <module>
ModuleNotFoundError: No module named 'pydantic_core._pydantic_core'
Note

Also, is there a way to capture the app log (not the test log) when running flet test? I had to rely on a sleep to read the error 😅

async def test_example(flet_app: ftt.FletTestApp):
    await sleep(15)  # Wait to be able to read the app error
    assert False
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