input: Write a python function to execute a piece of code within a sandbox environment and return the result and the time taken. 
  assert safely_exec("print('hello')", request, db) == ('hello', expected_time)
  assert safely_exec("a = 5\nb = 10\nprint(a + b)", request, db) == ('15', expected_time)
  assert safely_exec("while True: pass", request, db) == ({'error': "The code could not be executed because it tried to do something illegal."}, expected_time)
output: import time
  import sys
  import traceback
  from io import StringIO
  
  def safely_exec(code, request, db):
      start_time = time.time()
      
      try:
          # Redirect stdout to capture print statements
          old_stdout = sys.stdout
          sys.stdout = StringIO()
          
          # Execute the code in a restricted namespace
          exec(code, {'__builtins__': {}})
          
          # Capture the output
          output = sys.stdout.getvalue().strip()
          
          # Restore stdout
          sys.stdout = old_stdout
          
          result = output
      except Exception as e:
          result = {'error': "The code could not be executed because it tried to do something illegal."}
      
      end_time = time.time()
      time_taken = end_time - start_time
      return (result, time_taken)