小编Mos*_*eed的帖子

我知道super用于调用超类中的init方法，我在理解什么kwargs知道需要关键参数时遇到了麻烦

它在这里做什么？

class LoginScreen(GridLayout):

    def __init__(self, **kwargs):
        super().__init__(**kwargs)
        self.cols = 2
        self.add_widget(Label(text = "Username: "))
        self.username = TextInput(multiline = False)
        self.add_widget(self.username)

        self.add_widget(Label(text="Password: "))
        self.username = TextInput(multiline=False, password=True)
        self.add_widget(self.username)

        self.add_widget(Label(text="Two Factor Auth: "))
        self.tffa = TextInput(multiline=False, password=True)
        self.add_widget(self.tffa)

我试图找到数组中正数、负数和零的分数，但该函数没有返回任何内容。

var noOfPostive = 0;
var noOfNegative = 0;
var noOfZero = 0;

function plusMinus(arr) {
  /*
   * Write your code here.
   
   */
  var length = arr.length;

  for (var i = 0; i < arr.length; i++) {
    if (i > 0) {
      noOfPostive += 1;
    } else if (i < 0) {
      noOfNegative += 1;
    } else {
      noOfZero += 1;
    }

    var FractionOfPostive = noOfPostive / length;
    var FractionOfNegative = noOfNegative / length;
    var FractionOfZero = noOfZero / length; …