title: Combine dictionary according to key value in python
body: <p>Let us Assume, I have a key value pair in python, such as the following.</p>
  
  <pre><code>a = {'44': [0, 0, 1, 0, 1], '43': [0, 0, 1, 0, 0]}
  </code></pre>
  
  <p>now I want to combine these values with:</p>
  
  <pre><code>b = {'44': ['test1'], '43': ['test2']}
  </code></pre>
  
  <p>How can I do the output below in python?</p>
  
  <pre><code>c = {'44': [0, 0, 1, 0, 1, 'test1], '43': [0, 0, 1, 0, 0,'test2']}
  </code></pre>