fix some problems with old python

testsuites/suite.py

@@ -173,7 +173,7 @@ class Run:
 
 	def expected_stdout_presented(self) -> bool:
 		return self.__t_stdout is not None
-	
+
 	def get_expected_stdout(self) -> str:
 		assert self.__t_stdout is not None
 		return self.__t_stdout
@@ -499,7 +499,7 @@ class Tester:
 
 		end = now()
 
-		print(f"{"=" * 30}")
+		print("=" * 30)
 		print(f"{result.passed()}/{result.n()} tests passed in {end - start}ms")
 
 		return result