搜索
搜索

退出循环时字典中的列表为空

Harshal Dhone 发表于 Dev
28
夏尔·多恩

这是我为网络抓取编写的代码，我想将所有数据保存在字典中，然后保存到数据框中。直到上一次迭代时，它都会保存字典，但是当退出循环时，目录中的所有列表都为空

i=2011
#league_data={}
team_names=[]
team_points=[]
while i<2021:
    print(i)
    url="https://www.skysports.com/premier-league-table/"+str(i)
    page=requests.get(url)
    #print(page.status_code)
    soup= BeautifulSoup(page.text,'html.parser')
    league=soup.find('table',class_ ='standing-table__table')
    league_table = league.find_all('tbody')
    for league_teams in league_table: 
        rows = league_teams.find_all('tr')
        for row in rows:
            if i==2011:
                team_name = row.find('td', class_ ='standing-table__cell standing-table__cell--name').text.strip()
                team_names.append(team_name)   
            team_point = row.find_all('td', class_ = 'standing-table__cell')[9].text.strip()
            team_points.append(team_point)
                
        print(team_points)
        
    
    league_data[i]=team_points
    print(league_data)
    team_points.clear()
    i=i+1

#print(team_names)
#print(len(team_names))
 

print(league_data)

这是输出。在输出中，我在每次迭代中都打印了列表和字典状态

2011
['89', '89', '70', '69', '65', '64', '56', '52', '52', '47', '47', '47', '45', '45', '43', '38', '37', '36', '31', '25']
{2011: ['89', '89', '70', '69', '65', '64', '56', '52', '52', '47', '47', '47', '45', '45', '43', '38', '37', '36', '31', '25'], 2012: [], 2013: [], 2014: [], 2015: [], 2016: [], 2017: [], 2018: [], 2019: [], 2020: []}
2012
['89', '78', '75', '73', '72', '63', '61', '49', '46', '46', '44', '43', '42', '41', '41', '41', '39', '36', '28', '25']
{2011: ['89', '78', '75', '73', '72', '63', '61', '49', '46', '46', '44', '43', '42', '41', '41', '41', '39', '36', '28', '25'], 2012: ['89', '78', '75', '73', '72', '63', '61', '49', '46', '46', '44', '43', '42', '41', '41', '41', '39', '36', '28', '25'], 2013: [], 2014: [], 2015: [], 2016: [], 2017: [], 2018: [], 2019: [], 2020: []}
2013
['86', '84', '82', '79', '72', '69', '64', '56', '50', '49', '45', '42', '40', '38', '38', '37', '36', '33', '32', '30']
{2011: ['86', '84', '82', '79', '72', '69', '64', '56', '50', '49', '45', '42', '40', '38', '38', '37', '36', '33', '32', '30'], 2012: ['86', '84', '82', '79', '72', '69', '64', '56', '50', '49', '45', '42', '40', '38', '38', '37', '36', '33', '32', '30'], 2013: ['86', '84', '82', '79', '72', '69', '64', '56', '50', '49', '45', '42', '40', '38', '38', '37', '36', '33', '32', '30'], 2014: [], 2015: [], 2016: [], 2017: [], 2018: [], 2019: [], 2020: []}
2014
['87', '79', '75', '70', '64', '62', '60', '56', '54', '48', '47', '47', '44', '41', '39', '38', '38', '35', '33', '30']
{2011: ['87', '79', '75', '70', '64', '62', '60', '56', '54', '48', '47', '47', '44', '41', '39', '38', '38', '35', '33', '30'], 2012: ['87', '79', '75', '70', '64', '62', '60', '56', '54', '48', '47', '47', '44', '41', '39', '38', '38', '35', '33', '30'], 2013: ['87', '79', '75', '70', '64', '62', '60', '56', '54', '48', '47', '47', '44', '41', '39', '38', '38', '35', '33', '30'], 2014: ['87', '79', '75', '70', '64', '62', '60', '56', '54', '48', '47', '47', '44', '41', '39', '38', '38', '35', '33', '30'], 2015: [], 2016: [], 2017: [], 2018: [], 2019: [], 2020: []}
2015
['81', '71', '70', '66', '66', '63', '62', '60', '51', '50', '47', '47', '45', '43', '42', '42', '39', '37', '34', '17']
{2011: ['81', '71', '70', '66', '66', '63', '62', '60', '51', '50', '47', '47', '45', '43', '42', '42', '39', '37', '34', '17'], 2012: ['81', '71', '70', '66', '66', '63', '62', '60', '51', '50', '47', '47', '45', '43', '42', '42', '39', '37', '34', '17'], 2013: ['81', '71', '70', '66', '66', '63', '62', '60', '51', '50', '47', '47', '45', '43', '42', '42', '39', '37', '34', '17'], 2014: ['81', '71', '70', '66', '66', '63', '62', '60', '51', '50', '47', '47', '45', '43', '42', '42', '39', '37', '34', '17'], 2015: ['81', '71', '70', '66', '66', '63', '62', '60', '51', '50', '47', '47', '45', '43', '42', '42', '39', '37', '34', '17'], 2016: [], 2017: [], 2018: [], 2019: [], 2020: []}
2016
['93', '86', '78', '76', '75', '69', '61', '46', '46', '45', '45', '44', '44', '41', '41', '40', '40', '34', '28', '24']
{2011: ['93', '86', '78', '76', '75', '69', '61', '46', '46', '45', '45', '44', '44', '41', '41', '40', '40', '34', '28', '24'], 2012: ['93', '86', '78', '76', '75', '69', '61', '46', '46', '45', '45', '44', '44', '41', '41', '40', '40', '34', '28', '24'], 2013: ['93', '86', '78', '76', '75', '69', '61', '46', '46', '45', '45', '44', '44', '41', '41', '40', '40', '34', '28', '24'], 2014: ['93', '86', '78', '76', '75', '69', '61', '46', '46', '45', '45', '44', '44', '41', '41', '40', '40', '34', '28', '24'], 2015: ['93', '86', '78', '76', '75', '69', '61', '46', '46', '45', '45', '44', '44', '41', '41', '40', '40', '34', '28', '24'], 2016: ['93', '86', '78', '76', '75', '69', '61', '46', '46', '45', '45', '44', '44', '41', '41', '40', '40', '34', '28', '24'], 2017: [], 2018: [], 2019: [], 2020: []}
2017
['100', '81', '77', '75', '70', '63', '54', '49', '47', '44', '44', '44', '42', '41', '40', '37', '36', '33', '33', '31']
{2011: ['100', '81', '77', '75', '70', '63', '54', '49', '47', '44', '44', '44', '42', '41', '40', '37', '36', '33', '33', '31'], 2012: ['100', '81', '77', '75', '70', '63', '54', '49', '47', '44', '44', '44', '42', '41', '40', '37', '36', '33', '33', '31'], 2013: ['100', '81', '77', '75', '70', '63', '54', '49', '47', '44', '44', '44', '42', '41', '40', '37', '36', '33', '33', '31'], 2014: ['100', '81', '77', '75', '70', '63', '54', '49', '47', '44', '44', '44', '42', '41', '40', '37', '36', '33', '33', '31'], 2015: ['100', '81', '77', '75', '70', '63', '54', '49', '47', '44', '44', '44', '42', '41', '40', '37', '36', '33', '33', '31'], 2016: ['100', '81', '77', '75', '70', '63', '54', '49', '47', '44', '44', '44', '42', '41', '40', '37', '36', '33', '33', '31'], 2017: ['100', '81', '77', '75', '70', '63', '54', '49', '47', '44', '44', '44', '42', '41', '40', '37', '36', '33', '33', '31'], 2018: [], 2019: [], 2020: []}
2018
['98', '97', '72', '71', '70', '66', '57', '54', '52', '52', '50', '49', '45', '45', '40', '39', '36', '34', '26', '16']
{2011: ['98', '97', '72', '71', '70', '66', '57', '54', '52', '52', '50', '49', '45', '45', '40', '39', '36', '34', '26', '16'], 2012: ['98', '97', '72', '71', '70', '66', '57', '54', '52', '52', '50', '49', '45', '45', '40', '39', '36', '34', '26', '16'], 2013: ['98', '97', '72', '71', '70', '66', '57', '54', '52', '52', '50', '49', '45', '45', '40', '39', '36', '34', '26', '16'], 2014: ['98', '97', '72', '71', '70', '66', '57', '54', '52', '52', '50', '49', '45', '45', '40', '39', '36', '34', '26', '16'], 2015: ['98', '97', '72', '71', '70', '66', '57', '54', '52', '52', '50', '49', '45', '45', '40', '39', '36', '34', '26', '16'], 2016: ['98', '97', '72', '71', '70', '66', '57', '54', '52', '52', '50', '49', '45', '45', '40', '39', '36', '34', '26', '16'], 2017: ['98', '97', '72', '71', '70', '66', '57', '54', '52', '52', '50', '49', '45', '45', '40', '39', '36', '34', '26', '16'], 2018: ['98', '97', '72', '71', '70', '66', '57', '54', '52', '52', '50', '49', '45', '45', '40', '39', '36', '34', '26', '16'], 2019: [], 2020: []}
2019
['99', '81', '66', '66', '62', '59', '59', '56', '54', '54', '52', '49', '44', '43', '41', '39', '35', '34', '34', '21']
{2011: ['99', '81', '66', '66', '62', '59', '59', '56', '54', '54', '52', '49', '44', '43', '41', '39', '35', '34', '34', '21'], 2012: ['99', '81', '66', '66', '62', '59', '59', '56', '54', '54', '52', '49', '44', '43', '41', '39', '35', '34', '34', '21'], 2013: ['99', '81', '66', '66', '62', '59', '59', '56', '54', '54', '52', '49', '44', '43', '41', '39', '35', '34', '34', '21'], 2014: ['99', '81', '66', '66', '62', '59', '59', '56', '54', '54', '52', '49', '44', '43', '41', '39', '35', '34', '34', '21'], 2015: ['99', '81', '66', '66', '62', '59', '59', '56', '54', '54', '52', '49', '44', '43', '41', '39', '35', '34', '34', '21'], 2016: ['99', '81', '66', '66', '62', '59', '59', '56', '54', '54', '52', '49', '44', '43', '41', '39', '35', '34', '34', '21'], 2017: ['99', '81', '66', '66', '62', '59', '59', '56', '54', '54', '52', '49', '44', '43', '41', '39', '35', '34', '34', '21'], 2018: ['99', '81', '66', '66', '62', '59', '59', '56', '54', '54', '52', '49', '44', '43', '41', '39', '35', '34', '34', '21'], 2019: ['99', '81', '66', '66', '62', '59', '59', '56', '54', '54', '52', '49', '44', '43', '41', '39', '35', '34', '34', '21'], 2020: []}
2020
['40', '38', '38', '34', '33', '32', '32', '29', '29', '27', '26', '23', '23', '22', '19', '19', '17', '12', '11', '5']
{2011: ['40', '38', '38', '34', '33', '32', '32', '29', '29', '27', '26', '23', '23', '22', '19', '19', '17', '12', '11', '5'], 2012: ['40', '38', '38', '34', '33', '32', '32', '29', '29', '27', '26', '23', '23', '22', '19', '19', '17', '12', '11', '5'], 2013: ['40', '38', '38', '34', '33', '32', '32', '29', '29', '27', '26', '23', '23', '22', '19', '19', '17', '12', '11', '5'], 2014: ['40', '38', '38', '34', '33', '32', '32', '29', '29', '27', '26', '23', '23', '22', '19', '19', '17', '12', '11', '5'], 2015: ['40', '38', '38', '34', '33', '32', '32', '29', '29', '27', '26', '23', '23', '22', '19', '19', '17', '12', '11', '5'], 2016: ['40', '38', '38', '34', '33', '32', '32', '29', '29', '27', '26', '23', '23', '22', '19', '19', '17', '12', '11', '5'], 2017: ['40', '38', '38', '34', '33', '32', '32', '29', '29', '27', '26', '23', '23', '22', '19', '19', '17', '12', '11', '5'], 2018: ['40', '38', '38', '34', '33', '32', '32', '29', '29', '27', '26', '23', '23', '22', '19', '19', '17', '12', '11', '5'], 2019: ['40', '38', '38', '34', '33', '32', '32', '29', '29', '27', '26', '23', '23', '22', '19', '19', '17', '12', '11', '5'], 2020: ['40', '38', '38', '34', '33', '32', '32', '29', '29', '27', '26', '23', '23', '22', '19', '19', '17', '12', '11', '5']}
{2011: [], 2012: [], 2013: [], 2014: [], 2015: [], 2016: [], 2017: [], 2018: [], 2019: [], 2020: []}
阿米尔·塞勒姆

在league_data[i]=team_points执行此行league_data[i]并team_points指向同一对象后的问题（如您在我的输出中看到的，两者都具有相同的ID）

i=2011
league_data={}
team_names=[]
team_points=[]
while i<2021:
    print(i)
    url="https://www.skysports.com/premier-league-table/"+str(i)
    page=requests.get(url)
    #print(page.status_code)
    soup= BeautifulSoup(page.text,'html.parser')
    league=soup.find('table',class_ ='standing-table__table')
    league_table = league.find_all('tbody')
    for league_teams in league_table: 
        rows = league_teams.find_all('tr')
        for row in rows:
            if i==2011:
                team_name = row.find('td', class_ ='standing-table__cell standing-table__cell--name').text.strip()
                team_names.append(team_name)   
            team_point = row.find_all('td', class_ = 'standing-table__cell')[9].text.strip()
            team_points.append(team_point)
                
        print(team_points)
        
    
    league_data[i]=team_points

    print(league_data)
    print("Id of league_data[i]:", id(league_data[i]))
    print("Id of team_points   :",  id(team_points))
    team_points.clear()
    i=i+1
    break
#print(team_names)
#print(len(team_names))
 

print(league_data)

2011
['89', '89', '70', '69', '65', '64', '56', '52', '52', '47', '47', '47', '45', '45', '43', '38', '37', '36', '31', '25']
{2011: ['89', '89', '70', '69', '65', '64', '56', '52', '52', '47', '47', '47', '45', '45', '43', '38', '37', '36', '31', '25']}

Id of league_data[i]: 140615373022336
Id of team_points   : 140615373022336
{2011: []}

解决方案：只需将此行修改league_data[i]=team_points为league_data[i]=team_points.copy()。问题解决了

i=2011
league_data={}
team_names=[]
team_points=[]
while i<2021:
    print(i)
    url="https://www.skysports.com/premier-league-table/"+str(i)
    page=requests.get(url)
    #print(page.status_code)
    soup= BeautifulSoup(page.text,'html.parser')
    league=soup.find('table',class_ ='standing-table__table')
    league_table = league.find_all('tbody')
    for league_teams in league_table: 
        rows = league_teams.find_all('tr')
        for row in rows:
            if i==2011:
                team_name = row.find('td', class_ ='standing-table__cell standing-table__cell--name').text.strip()
                team_names.append(team_name)   
            team_point = row.find_all('td', class_ = 'standing-table__cell')[9].text.strip()
            team_points.append(team_point)
                
        print(team_points)
        
    
    league_data[i]=team_points.copy()

    print(league_data)
    print("Id of league_data[i]:", id(league_data[i]))
    print("Id of team_points   :",  id(team_points))
    team_points.clear()
    i=i+1
    break
#print(team_names)
#print(len(team_names))
 

print(league_data)

2011
['89', '89', '70', '69', '65', '64', '56', '52', '52', '47', '47', '47', '45', '45', '43', '38', '37', '36', '31', '25']
{2011: ['89', '89', '70', '69', '65', '64', '56', '52', '52', '47', '47', '47', '45', '45', '43', '38', '37', '36', '31', '25']}
Id of league_data[i]: 140615375754176
Id of team_points   : 140614558230912
{2011: ['89', '89', '70', '69', '65', '64', '56', '52', '52', '47', '47', '47', '45', '45', '43', '38', '37', '36', '31', '25']}

本文收集自互联网，转载请注明来源。

如有侵权，请联系 [email protected] 删除。

编辑于
0

我来说两句

0 条评论
登录 后参与评论

相关文章

在Python中合并两个字典列表中的值时，如何避免嵌套的for循环？

如何在使用while循环时将值附加到字典中的列表中？

如何删除字典列表中的空字典？

当YAML文件为空时加载空字典（Python 3.4）

字典为空时如何避免错误？

使用for循环在嵌套字典内的空列表中插入列表值

使用getline在行为空时退出循环

当React中过滤列表为空时如何显示消息

空列表中的空字典是否会使列表为非空

循环字典列表时如何在变量中存储值

在R中创建列表时为空值

如何设置NodeJS在退出之前等待事件循环为空？

当变量在javascript中为“否”时，循环遍历ajax调用以退出

循环以返回字典/列表嵌套中的字典内的值-必须为整数，或者切片不是str

包含字典的列表中的for循环

退出循环时无法退出

Vim：如果缓冲区列表为空，则退出

条件为真时退出内部循环

从可能包含字典列表但可能不包含字典的字典中读取时，如何使用for循环？

如何判断字典中的列表是否为空

循环后，Python字典为空

为什么将字典内容附加到列表并且在每次迭代中清除字典时，字典列表为空？

Python 循环从字典列表中升序值

删除值为空列表的字典的键

如果其中包含的字典列表具有特定键或列表为空，则返回字典列表中的每个元素

Python循环并从列表中构建字典

循环遍历列表中的多个字典，同时为增量变量赋值 - python

我尝试在特定键处添加一个列表，但字典中的列表为空

在列表字典中查找循环

TOP 榜单

  1. 1

    Qt Creator Windows 10 - “使用 jom 而不是 nmake”不起作用

  2. 2

    使用next.js时出现服务器错误，错误：找不到react-redux上下文值；请确保组件包装在<Provider>中

  3. 3

    SQL Server中的非确定性数据类型

  4. 4

    Swift 2.1-对单个单元格使用UITableView

  5. 5

    如何避免每次重新编译所有文件？

  6. 6

    在同一Pushwoosh应用程序上Pushwoosh多个捆绑ID

  7. 7

    Hashchange事件侦听器在将事件处理程序附加到事件之前进行侦听

  8. 8

    应用发明者仅从列表中选择一个随机项一次

  9. 9

    在 Avalonia 中是否有带有柱子的 TreeView 或类似的东西？

  10. 10

    HttpClient中的角度变化检测

  11. 11

    在Wagtail管理员中，如何禁用图像和文档的摘要项？

  12. 12

    如何了解DFT结果

  13. 13

    Camunda-根据分配的组过滤任务列表

  14. 14

    错误：找不到存根。请确保已调用spring-cloud-contract：convert

  15. 15

    为什么此后台线程中未处理的异常不会终止我的进程？

  16. 16

    构建类似于Jarvis的本地语言应用程序

  17. 17

    使用分隔符将成对相邻的数组元素相互连接

  18. 18

    您如何通过 Nativescript 中的 Fetch 发出发布请求？

  19. 19

    通过iwd从Linux系统上的命令行连接到wifi（适用于Linux的无线守护程序）

  20. 20

    使用React / Javascript在Wordpress API中通过ID获取选择的多个帖子/页面

  21. 21

    使用 text() 獲取特定文本節點的 XPath

热门标签

归档