[bug#35975] [PATCH 43/47] gnu: Add python-mypy.

[h.nasajpour]

* gnu/packages/python-xyz.scm (python-mypy): New variable
* gnu/packages/python-xyz.scm (python-mypy_extensions): New variable
---
 gnu/packages/python-xyz.scm | 41 +++++++++++++++++++++++++++++++++++++
 1 file changed, 41 insertions(+)

diff --git a/gnu/packages/python-xyz.scm b/gnu/packages/python-xyz.scm
index 93783d17ee..298a59f59f 100644
--- a/gnu/packages/python-xyz.scm
+++ b/gnu/packages/python-xyz.scm
@@ -15495,4 +15495,45 @@ by Igor Pavlov.")
         as they are based on the CPython 2.7 and 3.6 parsers.")
     (license license:expat)))
 
+(define-public python-mypy_extensions
+  (package
+  (name "python-mypy_extensions")
+    (version "0.4.1")
+    (source (origin
+      (method url-fetch)
+      (uri (pypi-uri "mypy_extensions" version))
+      (sha256 (base32 
"04h8brrbbx151dfa2cvvlnxgmb5wa00mhd2z7nd20s8kyibfkq1p"))))
+    (build-system python-build-system)
+    (arguments
+     `(#:tests? #f))
+    (home-page "http://www.mypy-lang.org/";)
+    (synopsis "Experimental type system extensions for programs checked with 
the mypy typechecker.")
+    (description
+     "The “mypy_extensions” module defines experimental extensions to the 
standard “typing” module that are supported by the mypy typechecker..")
+    (license license:expat)))
+
+(define-public python-mypy
+  (package
+  (name "python-mypy")
+    (version "0.701")
+    (source (origin
+      (method url-fetch)
+      (uri (pypi-uri "mypy" version))
+      (sha256 (base32 
"05479r3gbq17r22hyhxjg49smx5q864pgx8ayy23rsdj4w6z2r2p"))))
+    (build-system python-build-system)
+    (arguments
+     `(#:tests? #f))
+       (inputs `(
+               ("python-typed-ast" , python-typed-ast)
+               ("python-mypy_extensions" , python-mypy_extensions)
+               ("python-typed-ast" , python-typed-ast)
+               ))
+    (home-page "http://www.mypy-lang.org/";)
+    (synopsis "Optional static typing for Python (mypyc-compiled version)")
+    (description
+     "Add type annotations to your Python programs, and use mypy to type check 
them.
+        Mypy is essentially a Python linter on steroids, and it can catch many 
programming errors by analyzing your program,
+        without actually having to run it. Mypy has a powerful type system 
with features such as type inference,
+        gradual typing, generics and union types.")
+    (license license:expat)))
 
-- 
2.17.1