有大神知道这是什么原因么

错误原因（TypeError: 'str' object is not callable）——学习阶段（程序未写完，目前运行错误）
#learning


from bs4 import BeautifulSoup                
import re                 
import urllib.request,urllib.error       
import xlwt                
import sqlite3             


def main():
    baseurl='https://movie.douban.com/top250?start='
    # 1.爬取网页
    datelist=getDate(baseurl)
    savepath='.\\豆瓣电影Top250.xls'                         
    # 3.保存数据
    # saveDate(savepath)
    # askURL('https://movie.douban.com/top250?start=')

# 爬取网页
def getDate(baseurl):
    datelist=[]
    for i in range(0,10):         
        url = baseurl + str(i+25)
        html = askURL(url)         
        # 2.逐一解析数据
        soup = BeautifulSoup(html,'html.parser')
        for item in soup.find_all('div',class_="item"):           
            print(item)                                 ######运行这个后出现错误


    return datelist

#得到指定一个URL的网页内容
def askURL(url):
    headers = {      
        'User-Agent':'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) '
                            'Chrome/91.0.4472.77 Safari/537.36'
    }                
    #url = 'https://movie.douban.com/top250?start='
    req = urllib.request.Request(url=url,headers=headers)
    html=''          #存储
    try:
        response = urllib.request.urlopen(req)
        html=response.read().decode('utf-8')
        # print(html)
    except urllib.error.URLError as e:
        if hashlib(e,'code'):              
            print(e,code)
        if hashlib(e,'reason'):
            print(e,reason)
    return  html()

# 保存数据
def saveDate(savepath):
    print('save....')


if __name__ == '__main__':           
    main()

错误原因如下：                          
Traceback (most recent call last):
  File "C:/Users/Administrator/PycharmProjects/pythonProject/爬虫/test/1.py", line 60, in <module>
    main()                           #调用main()
  File "C:/Users/Administrator/PycharmProjects/pythonProject/爬虫/test/1.py", line 14, in main
    datelist=getDate(baseurl)
  File "C:/Users/Administrator/PycharmProjects/pythonProject/爬虫/test/1.py", line 25, in getDate
    html = askURL(url)          #保存获取到的网页源码
  File "C:/Users/Administrator/PycharmProjects/pythonProject/爬虫/test/1.py", line 52, in askURL
    return  html()
TypeError: 'str' object is not callable

不应该写成return html()，直接写return html,因为html是字符串对象，不能作为函数调用。

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