Fix pre-commit in python 3.6.0-3.6.1

.pre-commit-config.yaml

@@ -15,6 +15,7 @@ repos:
     rev: 3.7.9
     hooks:
     -   id: flake8
+        additional_dependencies: [flake8-typing-imports==1.5.0]
 -   repo: https://github.com/pre-commit/mirrors-autopep8
     rev: v1.4.4
     hooks:

pre_commit/languages/helpers.py

@@ -3,11 +3,11 @@ import os
 import random
 from typing import Any
 from typing import List
-from typing import NoReturn
 from typing import Optional
 from typing import overload
 from typing import Sequence
 from typing import Tuple
+from typing import TYPE_CHECKING
 
 import pre_commit.constants as C
 from pre_commit.hook import Hook
@@ -15,6 +15,9 @@ from pre_commit.prefix import Prefix
 from pre_commit.util import cmd_output_b
 from pre_commit.xargs import xargs
 
+if TYPE_CHECKING:
+    from typing import NoReturn
+
 FIXED_RANDOM_SEED = 1542676186
 
 
@@ -65,7 +68,7 @@ def no_install(
         prefix: Prefix,
         version: str,
         additional_dependencies: Sequence[str],
-) -> NoReturn:
+) -> 'NoReturn':
     raise AssertionError('This type is not installable')
 
 

pre_commit/parse_shebang.py

@@ -1,11 +1,14 @@
 import os.path
 from typing import Mapping
-from typing import NoReturn
 from typing import Optional
 from typing import Tuple
+from typing import TYPE_CHECKING
 
 from identify.identify import parse_shebang_from_file
 
+if TYPE_CHECKING:
+    from typing import NoReturn
+
 
 class ExecutableNotFoundError(OSError):
     def to_output(self) -> Tuple[int, bytes, None]:
@@ -44,7 +47,7 @@ def find_executable(
 
 
 def normexe(orig: str) -> str:
-    def _error(msg: str) -> NoReturn:
+    def _error(msg: str) -> 'NoReturn':
         raise ExecutableNotFoundError(f'Executable `{orig}` {msg}')
 
     if os.sep not in orig and (not os.altsep or os.altsep not in orig):