嵌套的同级For循环，输出到列表

Question

当我迭代以下内容时，在将数据追加到列表时遇到问题：

import urllib
import urllib.request
from bs4 import BeautifulSoup
import pandas

def make_soup(url):
    thepage = urllib.request.urlopen(url)
    thepage.addheaders = [('User-Agent', 'Mozilla/5.0')]
    soupdata = BeautifulSoup(thepage, 'html.parser')
    return soupdata

soup = make_soup('https://www.wellstar.org/locations/pages/default.aspx')

locationdata = []

for table in soup.findAll('table', class_ = 's4-wpTopTable'):
   for name in table.findAll('div', 'PurpleBackgroundHeading'):
       name = name.get_text(strip = True)
   for loc_type in table.findAll('h3', class_ = 'WebFont SpotBodyGreen'):
       loc_type = loc_type.get_text()
   for address in table.findAll('div', class_ = ['WS_Location_Address', 'WS_Location_Adddress']):
       address = address.get_text(strip = True, separator = ' ')
       locationdata.append([name, loc_type, address])

df = pandas.DataFrame(columns = ['name', 'loc_type', 'address'], data = locationdata)
print(df)

所生成的数据帧包括所有唯一地址，但是仅对应于name的最后可能的文本。

例如，尽管“WellStar Windy Hill医院”是医院类别/类型中的最后一家医院，但它显示为所有医院的名称。如果可能的话，我更喜欢list.append解决方案，因为我有几个更多，类似的步骤来完成这个项目。

Answer 1

之所以会出现这种情况，是因为您在附加到locationdata之前遍历了所有的名称和loc_types。

相反，您可以这样做：

import itertools as it
from pprint import pprint as pp

for table in soup.findAll('table', class_='s4-wpTopTable'):
  names = [name.get_text(strip=True) for 
           name in table.findAll('div', 'PurpleBackgroundHeading')]
  loc_types = [loc_type.get_text() for 
               loc_type in table.findAll('h3', class_='WebFont SpotBodyGreen')]
  addresses = [address.get_text(strip=True, separator=' ') for 
               address in table.findAll('div', class_=['WS_Location_Address',  
                                                       'WS_Location_Adddress'])]

for name, loc_type, address in it.izip_longest(names,loc_types,addresses):
  locationdata.append([name, loc_type, address])

结果：

>>> pp.pprint(locationdata)
[[u'WellStar Urgent Care in Acworth',
  u'WellStar Urgent Care Centers',
  u'4550 Cobb Parkway NW Suite 101 Acworth, GA 30101 770-917-8140'],
 [u'WellStar Urgent Care in Kennesaw',
  None,
  u'3805 Cherokee Street Kennesaw, GA 30144 770-426-5665'],
 [u'WellStar Urgent Care in Marietta - Delk Road',
  None,
  u'2890 Delk Road Marietta, GA 30067 770-955-8620'],
 [u'WellStar Urgent Care in Marietta - East Cobb',
  None,
  u'3747 Roswell Road Ne Suite 107 Marietta, GA 30062 470-956-0150'],
 [u'WellStar Urgent Care in Marietta - Kennestone',
  None,
  u'818 Church Street Suite 100 Marietta, GA 30060 770-590-4190'],
 [u'WellStar Urgent Care in Marietta - Sandy Plains Road',
  None,
  u'3600 Sandy Plains Road Marietta, GA 30066 770-977-4547'],
 [u'WellStar Urgent Care in Smyrna',
  None,
  u'4480 North Cooper Lake Road SE Suite 100 Smryna, GA 30082 770-333-1300'],
 [u'WellStar Urgent Care in Woodstock',
  None,
  u'120 Stonebridge Parkway Suite 310 Woodstock, GA 30189 678-494-2500']]