title: How to Create Nested Dictionary in Python with 3 lists
body: <p>Let us Suppose, I have created 3 lists and I want to create a dictionary for it. e.g.</p>
  
  <pre><code>a= ['A', 'B', 'C', 'D']
  b =[1, 2, 3, 4]
  c = [9, 8, 7, 6]
  </code></pre>
  
  <p>Now What I want is to create a dictionary like this:</p>
  
  <pre><code>{'A':{'1' :'9'} , 'B':{'2':'8'}, 'C':{'3':'7'} , 'D':{'4':'6'}}
  </code></pre>
  
  <p>is it possible, Can Someone Help me on this?</p>