python config_error ai_generated true

DeprecationWarning: datetime.datetime.utcnow() is deprecated FAILED tests/test_time.py::test_now - DeprecationWarning: ...

ID: python/pytest-warnings-as-errors-failing-ci

Also available as: JSON · Markdown · 中文
80%Fix Rate
85%Confidence
0Evidence
2024-06-11First Seen

Version Compatibility

VersionStatusIntroducedDeprecatedNotes
3.12 active — — —
3.13 active — — —

Root Cause

CI runs pytest with `-W error` (or `filterwarnings = error` in config), so any DeprecationWarning raised during test execution becomes a failure. This often appears after a Python minor upgrade.

generic

中文

CI 使用 `-W error`（或配置中的 `filterwarnings = error`）运行 pytest，因此测试执行期间抛出的任何 DeprecationWarning 都会变成失败。这通常在 Python 小版本升级后出现。

Workarounds

  1. 90% success 
    Ignore specific known-safe warnings via pytest config:

# pyproject.toml
[tool.pytest.ini_options]
filterwarnings = [
  "error",
  "ignore:datetime.datetime.utcnow\(\) is deprecated:DeprecationWarning",
]
  2. 98% success 
    Fix the deprecated call site:

from datetime import datetime, timezone
datetime.now(timezone.utc)  # replaces utcnow()

Dead Ends

Common approaches that don't work:

  1. 60% fail

    Hides all warnings, including ones the team intentionally turned into errors to catch regressions.

  2. 70% fail

    Only suppresses in that scope; other tests using the same deprecated API still fail.