code: def sing(a, b, c=False, name='yetone'):
      
      print('test0.sing: <a: {}, b: {}, c: {}> by {}'.format(a, b, c, name))
docs: sing a song
      hehe
  
      :param a: I'm a
      :param b: I'm b
      :param c: I'm c
      :param name: I'm name