docs: def update(packages, env=None, user=None):
      """
      Update conda packages in a conda env
  
      Attributes
      ----------
          packages: list of packages comma delimited
      """
      packages = ' '.join(packages.split(','))
      cmd = _create_conda_cmd('update', args=[packages, '--yes', '-q'], env=env, user=user)
      return _execcmd(cmd, user=user)