Pydantic + Python 3.11 crash

[avibrazil]

It's me again and now it crashes in a new OS.

Describe your environment

• Operating system: Fedora 37
• Python Version: 3.11.0

$ pip list -v | egrep "pydantic|freqtrade|fastapi|ccxt"
ccxt                  1.95.11     /home/aviram/.local/lib/python3.11/site-packages pip
fastapi               0.85.0      /home/aviram/.local/lib/python3.11/site-packages pip
freqtrade             2022.9.1    /home/aviram/.local/lib/python3.11/site-packages pip
pydantic              1.9.1       /usr/lib/python3.11/site-packages

The crash

$ freqtrade trade $dryrun $cnfs -s $strategy
2022-10-05 23:55:15,115 - freqtrade - INFO - freqtrade 2022.9.1
2022-10-05 23:55:15,279 - freqtrade - ERROR - Fatal exception!
Traceback (most recent call last):
  File "/home/aviram/.local/lib/python3.11/site-packages/freqtrade/main.py", line 39, in main
    return_code = args['func'](args)
                  ^^^^^^^^^^^^^^^^^^
  File "/home/aviram/.local/lib/python3.11/site-packages/freqtrade/commands/trade_commands.py", line 13, in start_trading
    from freqtrade.worker import Worker
  File "/home/aviram/.local/lib/python3.11/site-packages/freqtrade/worker.py", line 17, in <module>
    from freqtrade.freqtradebot import FreqtradeBot
  File "/home/aviram/.local/lib/python3.11/site-packages/freqtrade/freqtradebot.py", line 32, in <module>
    from freqtrade.rpc.external_message_consumer import ExternalMessageConsumer
  File "/home/aviram/.local/lib/python3.11/site-packages/freqtrade/rpc/external_message_consumer.py", line 19, in <module>
    from freqtrade.rpc.api_server.ws import WebSocketChannel
  File "/home/aviram/.local/lib/python3.11/site-packages/freqtrade/rpc/api_server/__init__.py", line 2, in <module>
    from .webserver import ApiServer
  File "/home/aviram/.local/lib/python3.11/site-packages/freqtrade/rpc/api_server/webserver.py", line 9, in <module>
    from fastapi import Depends, FastAPI
  File "/home/aviram/.local/lib/python3.11/site-packages/fastapi/__init__.py", line 7, in <module>
    from .applications import FastAPI as FastAPI
  File "/home/aviram/.local/lib/python3.11/site-packages/fastapi/applications.py", line 15, in <module>
    from fastapi import routing
  File "/home/aviram/.local/lib/python3.11/site-packages/fastapi/routing.py", line 23, in <module>
    from fastapi.dependencies.models import Dependant
  File "/home/aviram/.local/lib/python3.11/site-packages/fastapi/dependencies/models.py", line 3, in <module>
    from fastapi.security.base import SecurityBase
  File "/home/aviram/.local/lib/python3.11/site-packages/fastapi/security/__init__.py", line 1, in <module>
    from .api_key import APIKeyCookie as APIKeyCookie
  File "/home/aviram/.local/lib/python3.11/site-packages/fastapi/security/api_key.py", line 3, in <module>
    from fastapi.openapi.models import APIKey, APIKeyIn
  File "/home/aviram/.local/lib/python3.11/site-packages/fastapi/openapi/models.py", line 103, in <module>
    class Schema(BaseModel):
  File "/usr/lib/python3.11/site-packages/pydantic/main.py", line 292, in __new__
    cls.__signature__ = ClassAttribute('__signature__', generate_model_signature(cls.__init__, fields, config))
                                                        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/lib/python3.11/site-packages/pydantic/utils.py", line 258, in generate_model_signature
    merged_params[param_name] = Parameter(
                                ^^^^^^^^^^
  File "/usr/lib64/python3.11/inspect.py", line 2715, in __init__
    raise ValueError('{!r} is not a valid parameter name'.format(name))
ValueError: 'not' is not a valid parameter name

[xmatthias]

python 3.11 is not a stable version yet. your version will therefore not be 3.11.0 - but 3.11.0rc2 (or rc1).

The stable release of 3.11 is planned for the end of the month.
Based on experience from the 3.10 update, we will add support for python 3.11 a few weeks after this (once most libraries catch up with having wheels ready) - potentially months after this if there's problems with some dependencies.

until then, please stick to the supported python versions (3.8, 3.9 and 3.10).

---

It's also strange that you're on an outdated pydantic version (again) - which suggests that it's not a new environment - but an existing (older) version of 3.11.

pydantic added support for 3.11 in their 1.10 release - so that's most likely the culprit.

[avibrazil]

Thanks @xmatthias !
Indeed it works after updating pydantic to latest (1.10.2).

[marcelloexp386]

I had a similar problem when I tried to (re)install SpaCy with Python3.11. Since I upgraded to Python3.11 in January, I think that the problem is really with old versions of Pydantic. When I read this thread and upgraded pydantic, it all worked fine.