diff --git a/mypy/semanal.py b/mypy/semanal.py
index 790c0c6d96d7..dfffaf4a71f1 100644
--- a/mypy/semanal.py
+++ b/mypy/semanal.py
@@ -1109,7 +1109,8 @@ def analyze_namedtuple_classdef(self, defn: ClassDef) -> bool:
# in the named tuple class body.
is_named_tuple, info = True, defn.info # type: bool, Optional[TypeInfo]
else:
- is_named_tuple, info = self.named_tuple_analyzer.analyze_namedtuple_classdef(defn)
+ is_named_tuple, info = self.named_tuple_analyzer.analyze_namedtuple_classdef(
+ defn, self.is_stub_file)
if is_named_tuple:
if info is None:
self.mark_incomplete(defn.name, defn)
diff --git a/mypy/semanal_namedtuple.py b/mypy/semanal_namedtuple.py
index e0ba44885cfa..da65f6f063d2 100644
--- a/mypy/semanal_namedtuple.py
+++ b/mypy/semanal_namedtuple.py
@@ -41,7 +41,8 @@ def __init__(self, options: Options, api: SemanticAnalyzerInterface) -> None:
self.options = options
self.api = api
- def analyze_namedtuple_classdef(self, defn: ClassDef) -> Tuple[bool, Optional[TypeInfo]]:
+ def analyze_namedtuple_classdef(self, defn: ClassDef, is_stub_file: bool
+ ) -> Tuple[bool, Optional[TypeInfo]]:
"""Analyze if given class definition can be a named tuple definition.
Return a tuple where first item indicates whether this can possibly be a named tuple,
@@ -52,7 +53,7 @@ def analyze_namedtuple_classdef(self, defn: ClassDef) -> Tuple[bool, Optional[Ty
if isinstance(base_expr, RefExpr):
self.api.accept(base_expr)
if base_expr.fullname == 'typing.NamedTuple':
- result = self.check_namedtuple_classdef(defn)
+ result = self.check_namedtuple_classdef(defn, is_stub_file)
if result is None:
# This is a valid named tuple, but some types are incomplete.
return True, None
@@ -68,8 +69,10 @@ def analyze_namedtuple_classdef(self, defn: ClassDef) -> Tuple[bool, Optional[Ty
# This can't be a valid named tuple.
return False, None
- def check_namedtuple_classdef(
- self, defn: ClassDef) -> Optional[Tuple[List[str], List[Type], Dict[str, Expression]]]:
+ def check_namedtuple_classdef(self, defn: ClassDef, is_stub_file: bool
+ ) -> Optional[Tuple[List[str],
+ List[Type],
+ Dict[str, Expression]]]:
"""Parse and validate fields in named tuple class definition.
Return a three tuple:
@@ -78,7 +81,7 @@ def check_namedtuple_classdef(
* field default values
or None, if any of the types are not ready.
"""
- if self.options.python_version < (3, 6):
+ if self.options.python_version < (3, 6) and not is_stub_file:
self.fail('NamedTuple class syntax is only supported in Python 3.6', defn)
return [], [], {}
if len(defn.base_type_exprs) > 1:
diff --git a/test-data/unit/check-namedtuple.test b/test-data/unit/check-namedtuple.test
index 6d8626456403..c215fb7d7a97 100644
--- a/test-data/unit/check-namedtuple.test
+++ b/test-data/unit/check-namedtuple.test
@@ -44,6 +44,24 @@ x.x
x.y
x.z # E: "X" has no attribute "z"
+[case testNamedTupleClassPython35]
+# flags: --python-version 3.5
+from typing import NamedTuple
+
+class A(NamedTuple):
+ x = 3 # type: int
+[out]
+main:4: error: NamedTuple class syntax is only supported in Python 3.6
+
+[case testNamedTupleClassInStubPython35]
+# flags: --python-version 3.5
+import foo
+
+[file foo.pyi]
+from typing import NamedTuple
+
+class A(NamedTuple):
+ x: int
[case testNamedTupleAttributesAreReadOnly]
from collections import namedtuple
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