Require Python 3.6.2 (#5068)

* Bump python_requires to >= 3.6.2

* Import typing names directly
* Use typing.NamedTuple for MessageTest
* Add default value to MessageStyle

* Revert "Add an exception at install for python < 3.6.2 (#5171)"

This reverts commit 37e330cadd12800b484ef89cd599dcb06f1ba539.

Co-authored-by: Pierre Sassoulas <pierre.sassoulas@gmail.com>

1 files changed, 2 insertions, 6 deletions

diff --git a/pylint/checkers/strings.py b/pylint/checkers/strings.py
index eb43411de..fb145eaf8 100644
--- a/pylint/checkers/strings.py
+++ b/pylint/checkers/strings.py
@@ -41,7 +41,7 @@ import collections
 import numbers
 import re
 import tokenize
-from typing import TYPE_CHECKING, Iterable
+from typing import Counter, Iterable
 
 import astroid
 from astroid import nodes
@@ -50,9 +50,6 @@ from pylint.checkers import BaseChecker, BaseTokenChecker, utils
 from pylint.checkers.utils import check_messages
 from pylint.interfaces import IAstroidChecker, IRawChecker, ITokenChecker
 
-if TYPE_CHECKING:
-    from typing import Counter  # typing.Counter added in Python 3.6.1
-
 _AST_NODE_STR_TYPES = ("__builtin__.unicode", "__builtin__.str", "builtins.str")
 # Prefixes for both strings and bytes literals per
 # https://docs.python.org/3/reference/lexical_analysis.html#string-and-bytes-literals
@@ -774,8 +771,7 @@ class StringConstantChecker(BaseTokenChecker):
         Args:
           tokens: The tokens to be checked against for consistent usage.
         """
-        # typing.Counter added in Python 3.6.1 so this type hint must be a comment
-        string_delimiters = collections.Counter()  # type: Counter[str]
+        string_delimiters: Counter[str] = collections.Counter()
 
         # First, figure out which quote character predominates in the module
         for tok_type, token, _, _, _ in tokens: