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import nltk
nltk.download('omw-1.4')
nltk.download('punkt')

from nltk.stem import PorterStemmer
from nltk.stem import LancasterStemmer
from nltk.stem import WordNetLemmatizer
wordnet_lemmatizer = WordNetLemmatizer()
import os

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from pymongo import MongoClient

class MongoDBConnection(object):
    """MongoDB Connection"""
    def __init__(self, host='localhost', port=27017):
        self.host = host
        self.port = port
        self.connection = None
    def __enter__(self):
        self.connection = MongoClient(self.host, self.port)

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from ratelimit import limits, sleep_and_retry

import requests

FIFTEEN_MINUTES = 900

@sleep_and_retry
@limits(calls=15, period=FIFTEEN_MINUTES)
# 900秒内最多请求15次。
def call_api(url):

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db.getCollection("mastersportal_counrse").aggregate([
    
    {
        "$project": {
            "overview": {
                "$strLenCP": "$overview"
            },
            "about": {
                "$strLenCP": "$about"
            }

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from functools import wraps


def timethis(func):
    '''
    Create a decorator .
    '''

    @wraps(func)
    def wrapper(*args, **kwargs):

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var list = className("AbsListView").findOne();
for(var i = 0; i < list.childCount(); i++){
    var child = list.child(i);
    log(child.className());
}

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/** 通过元素的坐标进行点击事件
 * 
 * @param {*} selector 元素选择器
 */
function click_by_bounds(selector){

    var b = selector.findOne().bounds();
    return click(b.centerX(), b.centerY());
}

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from scrapy.http import Response

# 声明response类型，帮助IDE完成自动补全
def parse(self, response: Response):
      pass

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import unicodedata
s = 'T-shirt\xa0\xa0短袖圆领衫,\u3000体恤衫\xa0买一件\t吧'
unicodedata.normalize('NFKC', s)
# T-shirt  短袖圆领衫, 体恤衫 买一件 吧 

# 日常爬虫抓取数据中常遇到此类问题，使用率较高


    def unicode_normalize(unistr, form='NFKC'):
        """

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from jsonpath import jsonpath as _jsonpath


def jsonpath(obj, expr):
  """
  优先项：如果匹配到的结果只有一个，则直接pop出该结果
  """
  
    result = _jsonpath(obj, expr)
    if isinstance(result, list) and len(result) == 1: