old_contents: import sys
  
  from piper.core import Piper
  
  
  def main():
      # TODO: dat argparse
      env_key = sys.argv[1]
      set_key = sys.argv[2]
  
      piper = Piper(env_key, set_key)
      piper.setup()
      piper.execute()
  
new_contents: import sys
  
  import jsonschema
  from piper.core import Piper
  
  
  def main():
      # TODO: dat argparse
      env_key = sys.argv[1]
      set_key = sys.argv[2]
  
      piper = Piper(env_key, set_key)
      try:
          piper.setup()
          piper.execute()
      except jsonschema.exceptions.ValidationError as e:
          print(e)
          raise
  
subject: Implement very simple main executor