[Python-checkins] (no subject)

[Batuhan Taşkaya]

To: python-checkins at python.org
Subject:
 bpo-38870: Implement support for ast.FunctionType in ast.unparse (GH-19016)
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https://github.com/python/cpython/commit/5b66ec166b81c8a77286da2c0d17be3579c3=
069a
commit: 5b66ec166b81c8a77286da2c0d17be3579c3069a
branch: master
author: Batuhan Ta=C5=9Fkaya <47358913+isidentical at users.noreply.github.com>
committer: GitHub <noreply at github.com>
date: 2020-03-15T19:56:57Z
summary:

bpo-38870: Implement support for ast.FunctionType in ast.unparse (GH-19016)

files:
M Lib/ast.py
M Lib/test/test_unparse.py

diff --git a/Lib/ast.py b/Lib/ast.py
index 077eb92abb402..e347d8b9dab1d 100644
--- a/Lib/ast.py
+++ b/Lib/ast.py
@@ -741,6 +741,15 @@ def _write_docstring_and_traverse_body(self, node):
     def visit_Module(self, node):
         self._write_docstring_and_traverse_body(node)
=20
+    def visit_FunctionType(self, node):
+        with self.delimit("(", ")"):
+            self.interleave(
+                lambda: self.write(", "), self.traverse, node.argtypes
+            )
+
+        self.write(" -> ")
+        self.traverse(node.returns)
+
     def visit_Expr(self, node):
         self.fill()
         self.set_precedence(_Precedence.YIELD, node.value)
diff --git a/Lib/test/test_unparse.py b/Lib/test/test_unparse.py
index 3d87cfb6daeef..23292640086b9 100644
--- a/Lib/test/test_unparse.py
+++ b/Lib/test/test_unparse.py
@@ -122,10 +122,10 @@ class ASTTestCase(unittest.TestCase):
     def assertASTEqual(self, ast1, ast2):
         self.assertEqual(ast.dump(ast1), ast.dump(ast2))
=20
-    def check_ast_roundtrip(self, code1):
-        ast1 =3D ast.parse(code1)
+    def check_ast_roundtrip(self, code1, **kwargs):
+        ast1 =3D ast.parse(code1, **kwargs)
         code2 =3D ast.unparse(ast1)
-        ast2 =3D ast.parse(code2)
+        ast2 =3D ast.parse(code2, **kwargs)
         self.assertASTEqual(ast1, ast2)
=20
     def check_invalid(self, node, raises=3DValueError):
@@ -330,6 +330,14 @@ def test_constant_tuples(self):
             ast.Constant(value=3D(1, 2, 3), kind=3DNone), "(1, 2, 3)"
         )
=20
+    def test_function_type(self):
+        for function_type in (
+            "() -> int",
+            "(int, int) -> int",
+            "(Callable[complex], More[Complex(call.to_typevar())]) -> None"
+        ):
+            self.check_ast_roundtrip(function_type, mode=3D"func_type")
+
=20
 class CosmeticTestCase(ASTTestCase):
     """Test if there are cosmetic issues caused by unnecesary additions"""