old_contents: #!/usr/bin/env python
  # -*- coding: utf-8 -*-
  
  import sys
  import os
  import argparse
  import re
  import yaml
  
  def get_revision_number(yaml_content, tool_name):
      for tool in yaml_content['tools']:
          if tool["name"] == tool_name:
              if tool.has_key("revision"):
                  print tool["revision"][0]
  
  def get_owner(yaml_content, tool_name):
      for tool in yaml_content['tools']:
          if tool["name"] == tool_name:
              print tool['owner']
  
  if __name__ == '__main__':
      parser = argparse.ArgumentParser()
      parser.add_argument('--file', required=True)
      parser.add_argument('--tool_name', required=True)
      parser.add_argument('--tool_function', required=True)
      args = parser.parse_args()
  
      with open(args.file,'r') as yaml_file:
          yaml_content = yaml.load(yaml_file)
  
      functions = {
          'get_revision_number': get_revision_number,
          'get_owner': get_owner
      }
  
      functions[args.tool_function](yaml_content, args.tool_name)
new_contents: #!/usr/bin/env python
  # -*- coding: utf-8 -*-
  
  import sys
  import os
  import argparse
  import re
  import yaml
  
  def get_revision_number(yaml_content, tool_name):
      for tool in yaml_content['tools']:
          if tool["name"] == tool_name:
              if tool.has_key("revisions"):
                  print tool["revisions"][0]
  
  def get_owner(yaml_content, tool_name):
      for tool in yaml_content['tools']:
          if tool["name"] == tool_name:
              print tool['owner']
  
  if __name__ == '__main__':
      parser = argparse.ArgumentParser()
      parser.add_argument('--file', required=True)
      parser.add_argument('--tool_name', required=True)
      parser.add_argument('--tool_function', required=True)
      args = parser.parse_args()
  
      with open(args.file,'r') as yaml_file:
          yaml_content = yaml.load(yaml_file)
  
      functions = {
          'get_revision_number': get_revision_number,
          'get_owner': get_owner
      }
  
      functions[args.tool_function](yaml_content, args.tool_name)
subject: Correct key for revision in tool playbook parser