new_contents: #!/usr/bin/env python
  import os
  import subprocess
  import sys
  
  
  def main():
      darwin = sys.platform == 'darwin'
      directory = os.path.dirname(__file__)
      for builder in os.listdir(directory):
          if not builder.endswith('_build.py'):
              continue
          if builder.startswith('macosx_') and not darwin:
              continue
          fn = os.path.join(directory, builder)
          subprocess.check_call((sys.executable, fn))
  
  
  if __name__ == '__main__':
      main()
  
subject: Add a script for doing in-place builds (for development)