Added also typing.no_type_check as decorator that disables type checking on a function.

Author: spkersten

mypy/checker.py

@@ -1662,7 +1662,7 @@ def visit_decorator(self, e: Decorator) -> Type:
 
         for d in e.decorators:
             if isinstance(d, NameExpr):
-                if d.name == 'no_type_check':
+                if d.name == 'no_type_check' or d.name == 'typing.no_type_check':
                     return NoneTyp
 
         e.func.accept(self)

mypy/parse.py

@@ -314,7 +314,8 @@ def parse_decorated_function_or_class(self) -> Node:
         while self.current_str() == '@':
             self.expect('@')
             d_exp = self.parse_expression()
-            if isinstance(d_exp, NameExpr) and d_exp.name == 'no_type_check':
+            if isinstance(d_exp, NameExpr) and (d_exp.name == 'no_type_check' or
+                                                d_exp.name == 'typing.no_type_check'):
                 no_type_checks = True
             decorators.append(d_exp)
             self.expect_break()

mypy/test/data/check-functions.test

@@ -561,13 +561,11 @@ def f(x, y): pass
 
 
 [case testDecoratorThatSwitchesTypeWithMethod]
-from typing import no_type_checks
+from typing import no_type_check
 
 @no_type_check
 def foo(x: 'bar', y: {'x': 4}) -> 42:
     1 + 'x'
-[out]
-x
 
 
 -- Conditional function definition

mypy/test/data/lib-stub/typing.py

@@ -35,3 +35,6 @@ def __next__(self) -> T: pass
 class Sequence(Generic[T]):
     @abstractmethod
     def __getitem__(self, n: Any) -> T: pass
+
+def no_type_check(func):
+    return func