gnu: Add python-grpcio.

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

gnu/packages/python-xyz.scm

@@ -14713,6 +14713,26 @@ of Python libraries for building Python applications.")
 source via the AST.")
     (license license:bsd-3)))
 
+(define-public python-grpcio
+  (package
+    (name "python-grpcio")
+    (version "1.17.1")
+    (source
+     (origin
+       (method url-fetch)
+       (uri (pypi-uri "grpcio" version))
+       (sha256
+        (base32
+         "0qb9y6j83nxa6d4kc60i8yfgdm7a8ms7b54kncjzf5y7nsxp8rzx"))))
+    (build-system python-build-system)
+    (propagated-inputs
+     `(("python-six" ,python-six)))
+    (home-page "https://grpc.io")
+    (synopsis "HTTP/2-based RPC framework")
+    (description "This package provides a Python library for communicating
+with the HTTP/2-based RPC framework gRPC.")
+    (license license:asl2.0)))
+
 (define-public python-astunparse
   (package
     (name "python-astunparse")