Remove unnecessary casts after pinning Mypy to >= 0.740

diff --git a/Pipfile b/Pipfile
index 91054fdbca11982182a355da81f0de2ebce752ff..3784810e5a037fac7b09db52d57dfff702c9d949 100644 (file)
--- a/Pipfile
+++ b/Pipfile
@@ -22,7 +22,7 @@ docutils = "==0.15"  # not a direct dependency, see https://github.com/pypa/pipe
 flake8 = "*"
 flake8-bugbear = "*"
 flake8-mypy = "*"
-mypy = ">=0.620"
+mypy = ">=0.740"
 readme_renderer = "*"
 recommonmark = "*"
 Sphinx = "*"

diff --git a/black.py b/black.py
index 953d532a6567fa3493f1b454df79452b2e831b93..b3699d595f602e3bcd377fefa111d872a62b8f64 100644 (file)
--- a/black.py
+++ b/black.py
@@ -3669,14 +3669,12 @@ def _fixup_ast_constants(
     node: Union[ast.AST, ast3.AST, ast27.AST]
 ) -> Union[ast.AST, ast3.AST, ast27.AST]:
     """Map ast nodes deprecated in 3.8 to Constant."""
-    # casts are required until this is released:
-    # https://github.com/python/typeshed/pull/3142
     if isinstance(node, (ast.Str, ast3.Str, ast27.Str, ast.Bytes, ast3.Bytes)):
-        return cast(ast.AST, ast.Constant(value=node.s))
-    elif isinstance(node, (ast.Num, ast3.Num, ast27.Num)):
-        return cast(ast.AST, ast.Constant(value=node.n))
-    elif isinstance(node, (ast.NameConstant, ast3.NameConstant)):
-        return cast(ast.AST, ast.Constant(value=node.value))
+        return ast.Constant(value=node.s)
+    if isinstance(node, (ast.Num, ast3.Num, ast27.Num)):
+        return ast.Constant(value=node.n)
+    if isinstance(node, (ast.NameConstant, ast3.NameConstant)):
+        return ast.Constant(value=node.value)
     return node