gnu: Add python-validators.

* gnu/packages/python-xyz.scm (python-validators, python2-validators): New
public variables.

gnu/packages/python-xyz.scm

@@ -14062,6 +14062,41 @@ validation of URIs (see RFC 3986) and IRIs (see RFC 3987).")
 (define-public python2-rfc3987
   (package-with-python2 python-rfc3987))
 
+(define-public python-validators
+  (package
+    (name "python-validators")
+    (version "0.14.2")
+    (source (origin
+              (method url-fetch)
+              (uri (pypi-uri "validators" version))
+              (sha256
+               (base32
+                "024m15j33szd0v8k5l4ccish6n0b4knq81gmb4fq25ynwyyyd4mi"))))
+    (build-system python-build-system)
+    (arguments
+     '(#:phases (modify-phases %standard-phases
+                  (replace 'check
+                    (lambda _
+                      (invoke "pytest" "-vv"))))))
+    (propagated-inputs
+     `(("python-decorator" ,python-decorator)
+       ("python-six" ,python-six)))
+    (native-inputs
+     `(("python-flake8" ,python-flake8)
+       ("python-isort" ,python-isort)
+       ("python-pytest" ,python-pytest)))
+    (home-page "https://github.com/kvesteri/validators")
+    (synopsis "Data validation library")
+    (description
+     "This package contains validators for different things such as email
+addresses, IP addresses, URLs, hashes and more.  It has been designed to
+be easy to use and not require defining a schema or form just to validate
+some input.")
+    (license license:expat)))
+
+(define-public python2-validators
+  (package-with-python2 python-validators))
+
 (define-public python-validate-email
   (package
     (name "python-validate-email")