Activate and fix existing use-set-for-membership checks (#5379)

* Activate and fix existing use-set-for-membership checks

1 files changed, 4 insertions, 4 deletions

diff --git a/pylint/checkers/format.py b/pylint/checkers/format.py
index 3756d7d0e..cdbacd4cf 100644
--- a/pylint/checkers/format.py
+++ b/pylint/checkers/format.py
@@ -411,9 +411,9 @@ class FormatChecker(BaseTokenChecker):
                     contains_double_parens -= 1
                     continue
                 # ')' can't happen after if (foo), since it would be a syntax error.
-                if tokens[i + 1].string in (":", ")", "]", "}", "in") or tokens[
+                if tokens[i + 1].string in {":", ")", "]", "}", "in"} or tokens[
                     i + 1
-                ].type in (tokenize.NEWLINE, tokenize.ENDMARKER, tokenize.COMMENT):
+                ].type in {tokenize.NEWLINE, tokenize.ENDMARKER, tokenize.COMMENT}:
                     if contains_walrus_operator and walrus_operator_depth - 1 == depth:
                         return
                     # The empty tuple () is always accepted.
@@ -424,7 +424,7 @@ class FormatChecker(BaseTokenChecker):
                             self.add_message(
                                 "superfluous-parens", line=line_num, args=keyword_token
                             )
-                    elif keyword_token in ("return", "yield"):
+                    elif keyword_token in {"return", "yield"}:
                         self.add_message(
                             "superfluous-parens", line=line_num, args=keyword_token
                         )
@@ -439,7 +439,7 @@ class FormatChecker(BaseTokenChecker):
                     return
                 # 'and' and 'or' are the only boolean operators with lower precedence
                 # than 'not', so parens are only required when they are found.
-                if token[1] in ("and", "or"):
+                if token[1] in {"and", "or"}:
                     found_and_or = True
                 # A yield inside an expression must always be in parentheses,
                 # quit early without error.