code: def build_src(ctx, dest=None):
      
      if dest:
          if not dest.startswith('/'):
              # Relative
              dest = os.path.join(os.getcwd(), dest)
  
          os.chdir(PROJECT_DIR)
          ctx.run('python setup.py sdist --dist-dir {0}'.format(dest))
      else:
          os.chdir(PROJECT_DIR)
          ctx.run('python setup.py sdist')
docs: build source archive