drop python3.6 support

python 3.6 reached end of life on 2021-12-23

Committed via https://github.com/asottile/all-repos

pre_commit_hooks/sort_simple_yaml.py

@@ -17,16 +17,16 @@ We assume a strict subset of YAML that looks like:
 In other words, we don't sort deeper than the top layer, and might corrupt
 complicated YAML files.
 """
+from __future__ import annotations
+
 import argparse
-from typing import List
-from typing import Optional
 from typing import Sequence
 
 
 QUOTES = ["'", '"']
 
 
-def sort(lines: List[str]) -> List[str]:
+def sort(lines: list[str]) -> list[str]:
     """Sort a YAML file in alphabetical order, keeping blocks together.
 
     :param lines: array of strings (without newlines)
@@ -44,7 +44,7 @@ def sort(lines: List[str]) -> List[str]:
     return new_lines
 
 
-def parse_block(lines: List[str], header: bool = False) -> List[str]:
+def parse_block(lines: list[str], header: bool = False) -> list[str]:
     """Parse and return a single block, popping off the start of `lines`.
 
     If parsing a header block, we stop after we reach a line that is not a
@@ -60,7 +60,7 @@ def parse_block(lines: List[str], header: bool = False) -> List[str]:
     return block_lines
 
 
-def parse_blocks(lines: List[str]) -> List[List[str]]:
+def parse_blocks(lines: list[str]) -> list[list[str]]:
     """Parse and return all possible blocks, popping off the start of `lines`.
 
     :param lines: list of lines
@@ -77,7 +77,7 @@ def parse_blocks(lines: List[str]) -> List[List[str]]:
     return blocks
 
 
-def first_key(lines: List[str]) -> str:
+def first_key(lines: list[str]) -> str:
     """Returns a string representing the sort key of a block.
 
     The sort key is the first YAML key we encounter, ignoring comments, and
@@ -99,7 +99,7 @@ def first_key(lines: List[str]) -> str:
         return ''  # not actually reached in reality
 
 
-def main(argv: Optional[Sequence[str]] = None) -> int:
+def main(argv: Sequence[str] | None = None) -> int:
     parser = argparse.ArgumentParser()
     parser.add_argument('filenames', nargs='*', help='Filenames to fix')
     args = parser.parse_args(argv)