title: PYTHON IndexError: tuple index out of range
body: <p>Would really appreciate feedback on this issue</p>
  
  <pre><code>import subprocess
  
  def main():
  '''
  Here's where the whole thing starts.
  '''
  #Edit this constant to change the file name in the git log command.
  FILE_NAME = 'file1.xml'
  
  #Do the git describe command to get the tag names.
  gitDescribe = 'git describe --tags `git rev-list --tags --max-count=2`'
  print ('Invoking: {0}'.format(gitDescribe))
  p1 = subprocess.Popen(gitDescribe, shell=True, stdout=subprocess.PIPE)
  output = p1.stdout.read()
  
  #Get the first 2 tags from the output.
  parsedOutput = output.split('\n')
  tag1 = parsedOutput[0]
  tag2 = parsedOutput[1]
  
  print('First revision: {0}'.format(tag1))
  print('Second revision: {1}'.format(tag2))
  #Do the git log command for the revision comparison.
  gitLog = 'git log {0}..{1} --pretty=format:"%an %h %ad %d %s" --date=short --topo-order --no-merges {2}'.format(tag1, tag2, FILE_NAME)
  print('Invoking: {0}'.format(gitLog))
  p2 = subprocess.Popen(gitLog, shell=True, stdout=subprocess.PIPE)
  output = p2.stdout.read()
  print(output)
  
  if __name__ == "__main__":
      main()
  </code></pre>
  
  <p>...</p>
  
  <pre><code>bash-3.2$ python pygit5.py 
  Invoking: git describe --tags `git rev-list --tags --max-count=2`
  
  First revision: 14.5.5.1
  Traceback (most recent call last):
  File "pygit5.py", line 31, in &lt;module&gt;
  main()
  File "pygit5.py", line 22, in main
  print('Second revision: {1}'.format(tag2))
  IndexError: tuple index out of range
  </code></pre>