gnu: Add python-pyannotate.

* gnu/packages/python-check.scm (python-pyannotate): New variable.

gnu/packages/python-check.scm

@@ -10,6 +10,7 @@
 ;;; Copyright © 2020 Vinicius Monego <monego@posteo.net>
 ;;; Copyright © 2020 Tanguy Le Carrour <tanguy@bioneland.org>
 ;;; Copyright © 2021 Sharlatan Hellseher <sharlatanus@gmail.com>
+;;; Copyright © 2021 Brendan Tildesley <mail@brendan.scot>
 ;;;
 ;;; This file is part of GNU Guix.
 ;;;
@@ -1183,6 +1184,28 @@ (define-public python-mypy
     ;; mypyc/lib-rt/getargs.c
     (license (list license:expat license:psfl))))
 
+(define-public python-pyannotate
+  (package
+    (name "python-pyannotate")
+    (version "1.2.0")
+    (source
+     (origin
+       (method url-fetch)
+       (uri (pypi-uri "pyannotate" version))
+       (sha256
+        (base32
+         "16bm0mf7wxvy0lgmcs1p8n1ji8pnvj1jvj8zk3am70dkp825iv84"))))
+    (build-system python-build-system)
+    (propagated-inputs
+     `(("python-mypy-extensions" ,python-mypy-extensions)
+       ("python-six" ,python-six)))
+    (home-page
+     "https://github.com/dropbox/pyannotate")
+    (synopsis "Auto-generate PEP-484 annotations")
+    (description "This package, PyAnnotate, is used to auto-generate PEP-484
+annotations.")
+    (license license:asl2.0)))
+
 (define-public python-eradicate
   (package
     (name "python-eradicate")