title: Pythonic syntax to concatenate the keys and values of a dictionary
body: <p>I have a dictionary similar to this one</p>
  
  <pre><code>dic1 = {'Name': 'John', 'Time': 'morning'}
  </code></pre>
  
  <p>I want to concatenante the keys and values with a "_" separator with the following schema:</p>
  
  <pre><code>Name_John_Time_morning
  </code></pre>
  
  <p>This is equivalent to key1_value1_key2_value2</p>
  
  <p>I have tried the following line of code but without success</p>
  
  <pre><code>x + "_" + v for x,v in dict1.keys(), dict1.values()
  </code></pre>