Update app.py

app.py

@@ -125,7 +125,7 @@ logger = Logger.new('error.log')
 logger.error('error occurred')""",
 "start_time = Time.now",
 "Time.now - start_time",
-"20.times { |i| print "\r[#{'='(i+1)}#{' '(19-i)}]"; sleep(0.1) }",
+"20.times { |i| print \"\\r[#{'='*(i+1)}#{' '*(19-i)}]\"; sleep(0.1) }",
 "sleep(1)",
 "square = ->(x) { xx }",
 "squares = [1,2,3].map { |n| nn }",