ruff: Fix C417 Unnecessary `map` usage.

Signed-off-by: Anders Kaseorg <anders@zulip.com>

zerver/lib/integrations.py

@@ -94,7 +94,7 @@ class Integration:
                     + category
                     + "' is not a key in CATEGORIES.",
                 )
-        self.categories = list(map((lambda c: CATEGORIES[c]), categories))
+        self.categories = [CATEGORIES[c] for c in categories]
 
         self.logo_path = logo if logo is not None else self.get_logo_path()
         # TODO: Enforce that all integrations have logo_url with an assertion.

zerver/tests/test_markdown.py

@@ -235,7 +235,7 @@ class MarkdownMiscTest(ZulipTestCase):
         lst = get_possible_mentions_info(
             mention_backend, {"Fred Flintstone", "Cordelia, LEAR's daughter", "Not A User"}
         )
-        set_of_names = set(map(lambda x: x.full_name.lower(), lst))
+        set_of_names = {x.full_name.lower() for x in lst}
         self.assertEqual(set_of_names, {"fred flintstone", "cordelia, lear's daughter"})
 
         by_id = {row.id: row for row in lst}

zerver/tests/test_subs.py

@@ -5700,8 +5700,8 @@ class GetSubscribersTest(ZulipTestCase):
 
             # It's +1 because of the stream Rome.
             self.assert_length(never_sub, len(web_public_streams) + 1)
-            sub_ids = list(map(lambda stream: stream["stream_id"], sub))
-            unsub_ids = list(map(lambda stream: stream["stream_id"], unsub))
+            sub_ids = [stream["stream_id"] for stream in sub]
+            unsub_ids = [stream["stream_id"] for stream in unsub]
 
             for stream_dict in never_sub:
                 self.assertTrue(stream_dict["is_web_public"])