title: Adding a separate string to each item in the list
body: <p>I have a python list as follows:</p>
  
  <pre><code>new_list = ['emp_salary', 'manager_sal']
  </code></pre>
  
  <p>I want to change it to below:</p>
  
  <pre><code>['emp_salary' : 'float', 'manager_sal':'float']
  </code></pre>
  
  <p>I tried something like this:</p>
  
  <pre><code>    &gt;&gt;&gt; users_cols = [l+ ": float" for l in new_list]
     &gt;&gt;&gt; users_cols
         ['emp_salary: float', 'manager_sal: float']
  </code></pre>
  
  <p>But it is not exactly what i want. The actual list is very big and this is a small example</p>