bug#42792: [PATCH] gnu: Add python-pydantic.

[Mathieu Othacehe <othacehe@gnu.org>]

Hello Tanguy,

> * gnu/packages/python-xyz.scm (python-pydantic): New variable.

Applied with the following diff:

diff --git a/gnu/packages/python-xyz.scm b/gnu/packages/python-xyz.scm
index a36e99aa32..4102902465 100644
--- a/gnu/packages/python-xyz.scm
+++ b/gnu/packages/python-xyz.scm
@@ -3829,30 +3829,32 @@ Language (TOML) configuration files.")
        (method git-fetch)
        (uri (git-reference
              (url "https://github.com/samuelcolvin/pydantic")
-              (commit (string-append "v" version))))
+             (commit (string-append "v" version))))
        (file-name (git-file-name name version))
-       (sha256 (base32 "1380s9k77g6q15by9fkxndczjk89q6xpz09jdrqip535xws2z3j8"))))
+       (sha256
+        (base32 "1380s9k77g6q15by9fkxndczjk89q6xpz09jdrqip535xws2z3j8"))))
     (build-system python-build-system)
     (arguments
      '(#:phases
        (modify-phases %standard-phases
-         ;; Reported upstream: <https://github.com/samuelcolvin/pydantic/issues/1580>
-         ;; Not sure how to apply the suggested fix!?
+         ;; Reported upstream:
+         ;; <https://github.com/samuelcolvin/pydantic/issues/1580>.
+         ;; Disable the faulty test as the fix is unclear.
          (add-before 'check 'disable-test
            (lambda _
              (substitute* "tests/test_validators.py"
                (("test_assert_raises_validation_error")
-                 "_test_assert_raises_validation_error"))
+                "_test_assert_raises_validation_error"))
              #t))
          (replace 'check
            (lambda _ (invoke "pytest" "-vv" "tests"))))))
     (native-inputs
      `(("python-pytest" ,python-pytest)))
     (home-page "https://github.com/samuelcolvin/pydantic")
-    (synopsis "Data validation and settings management using python type hinting")
+    (synopsis "Python data validation and settings management")
     (description
-      "Pydantic enforces type hints at runtime, and provides user friendly errors
-when data is invalid.")
+     "Pydantic enforces type hints at runtime, and provides user friendly
+errors when data is invalid.")
     (license license:expat)))

Thanks,

Mathieu