Fix mypy for validate arg (only py3.8+)

Author: basepi

.pre-commit-config.yaml

@@ -15,7 +15,7 @@ repos:
     rev: v0.910
     hooks:
     -   id: mypy
-        args: [--strict]
+        args: [--strict, --show-error-codes]
 -   repo: https://github.com/ambv/black
     rev: 21.6b0
     hooks:

ecs_logging/_stdlib.py

@@ -76,11 +76,11 @@ def __init__(
         fmt=None,
         datefmt=None,
         style="%",
-        validate=True,
+        validate=None,
         stack_trace_limit=None,
         exclude_fields=(),
     ):
-        # type: (Any, Optional[str], Optional[str], str, bool, Optional[int], Sequence[str]) -> None
+        # type: (Any, Optional[str], Optional[str], str, Optional[bool], Optional[int], Sequence[str]) -> None
         """Initialize the ECS formatter.
 
         :param int stack_trace_limit:
@@ -99,8 +99,12 @@ def __init__(
 
                 exclude_keys=["error"]
         """
+        _kwargs = {}
+        if validate is not None:
+            # validate was introduced in py3.8 so we need to only provide it if the user provided it
+            _kwargs["validate"] = validate
         super(StdlibFormatter, self).__init__(
-            fmt=fmt, datefmt=datefmt, style=style, validate=validate
+            fmt=fmt, datefmt=datefmt, style=style, **_kwargs
         )
 
         if stack_trace_limit is not None:

noxfile.py

@@ -50,4 +50,4 @@ def lint(session):
     session.install("flake8", "black", "mypy")
     session.run("black", "--check", "--target-version=py27", *SOURCE_FILES)
     session.run("flake8", "--ignore=E501,W503", *SOURCE_FILES)
-    session.run("mypy", "--strict", "ecs_logging/")
+    session.run("mypy", "--strict", "--show-error-codes", "ecs_logging/")