pyinstaller package well but could not open exe

[wanghaisheng]

First Check

• I added a very descriptive title to this issue.
• I used the GitHub search to find a similar issue and didn't find it.
• I searched the FastAPI documentation, with the integrated search.
• I already searched in Google "How to X in FastAPI" and didn't find any information.
• I already read and followed all the tutorial in the docs and didn't find an answer.
• I already checked if it is not related to FastAPI but to Pydantic.
• I already checked if it is not related to FastAPI but to Swagger UI.
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Example Code

https://github.com/wanghaisheng/link-detec-shopconan/blob/main/main.py

Description

Traceback (most recent call last):
File "app.py", line 3, in
File "D:\Program Files\anaconda3\lib\site-packages\fastapi_init_.py", line 7, in
from .applications import FastAPI as FastAPI
File "D:\Program Files\anaconda3\lib\site-packages\fastapi\applications.py", line 4, in
from fastapi import routing
File "D:\Program Files\anaconda3\lib\site-packages\fastapi\routing.py", line 21, in
from fastapi import params
File "D:\Program Files\anaconda3\lib\site-packages\fastapi\params.py", line 4, in
from pydantic.fields import FieldInfo, Undefined
File "pydantic_init_.py", line 2, in init pydantic.init
ImportError: cannot import name dataclasses

Operating System

Windows

Operating System Details

No response

FastAPI Version

0.76.0

Python Version

3.8.5

Additional Context

No response

[acidjunk]

Does pyinstaller still use tree shaking to get a small binary?

I can imagine that the Cython part in Pydantic can cause problems:
https://pydantic-docs.helpmanual.io/install/

So pyinstaller might not package the pydantic stuff correctly (just my 2 cent)

[wanghaisheng]

that is helpful
i will try another machine /my mac +docker later and update more details
@acidjunk