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// N x repeated characters
const LEN = process.argv.length > 2 ? parseInt(process.argv[2]) : 4
console.log('LEN: ' + LEN)

function check(s) {
    let i = s.length - LEN
    const p = s.charAt(i)

    for (i++; i<s.length; i++) {
        if (p != s.charAt(i)) {

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(function () {
  "use strict";

  var view, viewModel, valueTemplate;

  valueTemplate = {
    configurable: false,
    enumerable: true,
    get: function () {
      return this._value;

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# observable
# observer
# reaction
# derivation
import time
from typing import Callable
from collections import defaultdict


from attr import attrib, attrs

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class Success(object):
    def __init__(self, value):
        self.value = value

class Error(object):
    def __init__(self, value):
        self.value = value

class wrapper(object):
    def __init__(self, result):

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import unicodecsv
from django.http import HttpResponse

def export_as_csv_action(description="Export selected objects as CSV file",
                         fields=None, exclude=None, header=True):
    """
    This function returns an export csv action
    'fields' and 'exclude' work like in django ModelForm
    'header' is whether or not to output the column names as the first row
    """

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"""

    导出数据
    ~~~~~~~~~~~~~

    反序列化数据列，支持字符，数组，字典等复杂结构，

    TODO:

        - 数据类型标注: string,bool,int,float

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const mapper = function() {
  const value = {
    country: this.country,
    province: this.province,
    city: this.city,
    region: this.region,
    wifi: this.wifi,
    app_version: this.app_version,
    os_version: this.os_version,
    os: this.os,

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import string
import random


def id_generator(size=64, chars=string.ascii_uppercase + string.digits):
    return ''.join(random.choice(chars) for _ in range(size))

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from django.dispatch import Signal

# 注册
user_created = Signal(providing_args=['user', 'app_id'])
# 更新
user_updated = Signal(providing_args=['user', 'app_id'])
# 登录
user_logged = Signal(providing_args=['user', 'ip', 'app_id'])
# 登出
user_logout = Signal(providing_args=['user', 'ip', 'app_id'])

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from django.db import models
from django.contrib.auth.models import User
from django.db.models.signals import post_save