BUG: missing fstring (#53990)

Author: jbrockmendel

pandas/_libs/tslibs/parsing.pyx

@@ -704,7 +704,7 @@ cdef datetime dateutil_parse(
                 #  we get tzlocal, once the deprecation is enforced will get
                 #  timezone.utc, not raise.
                 warnings.warn(
-                    "Parsing '{res.tzname}' as tzlocal (dependent on system timezone) "
+                    f"Parsing '{res.tzname}' as tzlocal (dependent on system timezone) "
                     "is deprecated and will raise in a future version. Pass the 'tz' "
                     "keyword or call tz_localize after construction instead",
                     FutureWarning,

pandas/tests/tslibs/test_parsing.py

@@ -29,7 +29,10 @@
 )
 def test_parsing_tzlocal_deprecated():
     # GH#50791
-    msg = "Pass the 'tz' keyword or call tz_localize after construction instead"
+    msg = (
+        "Parsing 'EST' as tzlocal.*"
+        "Pass the 'tz' keyword or call tz_localize after construction instead"
+    )
     dtstr = "Jan 15 2004 03:00 EST"
 
     with tm.set_timezone("US/Eastern"):