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嘗試將數據解析到列表的列表時遇到了問題。 我試圖抓取關於部門及其主題的信息。 但是,由於每個部門都有不同數量的主題,因此我需要創建一個列表清單,以便稍後將數據鏈接在一起。我已設法導航索引錯誤,並且問題似乎來自編譯主題列表。將數據解析到列表的列表
from lxml import html
import requests
page = requests.get('URL')
page_source_code = html.fromstring(page.text)
departments_list = []
subject_list = []
for dep in range(1,3):
departments = page_source_code.xpath('tag'
+str(dep)+']tag/text()')
### print(dep, departments)
if departments == []:
pass
else:
departments_list.append(departments[0])
for sub in range(1,20):
subjects = page_source_code.xpath('tag'
+str(dep)+']tag'
+str(sub)+']tag/text()')
### print(sub, subjects)
if subjects == []:
pass
else:
subject_list.append(subjects[0])
print('Department list ------ ', len(departments_list), departments_list, '\n')
print('Subject list ------ ', len(subject_list), subject_list)
我的輸出是這樣的:
Department list ------ 2 ['Department_1', 'Department_2']
Subject list ------ 7 ['Subject_1'(dep_1), 'Subject_2 '(dep_1), 'Subject_3 '(dep_1), 'Subject_4'(dep_1), 'Subject_5'(dep_2), 'Subject_6 '(dep_2), 'Subject_7 '(dep_2)']
此代碼似乎把所有科目到一個列表。我想,如下所示:
Subject list ------ 7 [['Subject_1'(dep_1), 'Subject_2 '(dep_1), 'Subject_3 '(dep_1), 'Subject_4'(dep_1)], ['Subject_5'(dep_2), 'Subject_6 '(dep_2), 'Subject_7 '(dep_2)']]