gnu: Add python-pydantic-cli.

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

Modified-by: Maxim Cournoyer <maxim.cournoyer@gmail.com>
Signed-off-by: Maxim Cournoyer <maxim.cournoyer@gmail.com>

gnu/packages/python-xyz.scm

@@ -5107,6 +5107,34 @@ which can produce feeds in RSS 2.0, RSS 0.91, and Atom formats.")
 errors when data is invalid.")
     (license license:expat)))
 
+(define-public python-pydantic-cli
+  (package
+    (name "python-pydantic-cli")
+    (version "4.3.0")
+    (source
+     (origin
+       (method git-fetch)               ;for tests
+       (uri (git-reference
+             (url "https://github.com/mpkocher/pydantic-cli")
+             (commit (string-append "v" version))))
+       (file-name (git-file-name name version))
+       (sha256
+        (base32
+         "1v4dx6n60rbsan5zpw2rgdih7lb3h0xclagn1p6zfwl0r9l9cvym"))))
+    (build-system python-build-system)
+    (propagated-inputs
+     (list python-pydantic))
+    (native-inputs
+     (list python-black
+           python-mypy
+           python-pytest))
+    (home-page "https://github.com/mpkocher/pydantic-cli")
+    (synopsis "Turn Pydantic defined data models into CLI tools")
+    (description
+     "@code{python-pydantic} enables specifying @acronym{CLI, Command Line
+Interfaces} via data models provided in the JSON format.")
+    (license license:expat)))
+
 (define-public python-pydocstyle
   (package
     (name "python-pydocstyle")