title: Merge list of tiff files to one using python
body: <p>I am tryin to merge list of tiff files to one. I can add 2 tiff files but not sure how to add list of tiff files. please help.</p>
  <pre><code>
  input1 = tifftools.read_tiff('sample1.tiff')
  input2 = tifftools.read_tiff('sample2.tiff')
  # Add input2 to input1
  input1['ifds'].extend(input2['ifds'])
  tifftools.write_tiff(input1, 'output.tiff')
  
  print('Merger Done') ```
  
  how can I add if I have a list of tiff file ex.
  ``` tff_lst=['a.tif','b.tif','c.tif','d.tif'] ```
  
  </code></pre>