title: how get current datetime on looping
body: <p>Begin.. sorry my english very bad</p>
  
  <p>i have some code of python.</p>
  
  <pre class="lang-py prettyprint-override"><code>def come():
      answer = input('yes or no : ').strip()
      str_datetime = now.strftime("%Y%m%d%H%M%S")
      if answer == 'yes':
          print('Okay.. {}'.format(answer))
          print(str_datetime)
      else:
          print('Please input yes or no again!')
      come()
  
  come()
  </code></pre>
  
  <p>problem is.. i want to get <strong>str_datetime</strong> always reload (always chanage according to the time to passes.. i mean)</p>