网络抓取无法同时获取页面中所有链接的数据
web scraping can't get data of all links in page at same time
从某一天开始，我将尝试使用其描述页面从 vesselfinder 中抓取所有船只数据，就像从描述页面中一样，我想要它的信息，例如 table 形式的船只类型、Imo 编号等。我尝试了不同的方法来做到这一点，但仍然有很多错误。首先，我发现我如何通过这些链接到它的描述页面，如何从所有页面获取所有这些链接，以及如何从它的描述页面获取特定的 table 数据（这仍然不完整但得到了一些).
但是今天我尝试同时从所有链接及其描述页面获取数据，它给了我很多错误让我很困惑（通过组合代码）。
我附上了我的代码，这不是很好，但到此为止 #print(len(vessellist)) 它在那之后工作......错误..
import requests
from bs4 import BeautifulSoup
import pandas as pd
headers = {
'user-agent': 'Mozilla/5.0',
'accept-language': 'en-GB,en-US;q=0.9,en;q=0.8',
}
baseurl = 'https://www.vesselfinder.com/vessels'
vessellist = []
for x in range(1,6):
response = requests.get(
f'https://www.vesselfinder.com/vessels?page={x}',
headers=headers)
soup = BeautifulSoup(response.content, 'html.parser')
contents = soup.find_all('td', class_='v2')
for property in contents:
for item in property.find_all('a', href=True):
vessellist.append(baseurl + item['href'])
for link in vessellist:
response = requests.get(link, headers=headers)
soup = BeautifulSoup(response.content, 'html.parser')
table = soup.find('table', class_ = 'tparams')
head = []
for i in table.find_all('td', class_ = 'n3'):
title = i.text
head.append(title)
values =[]
for row in table.find_all('td', class_ = 'v3'):
data = row.text
values.append(data)
df = pd.DataFrame(values)
print(df)
两个步骤：获取摘要数据（包括 href）。接下来获取详细信息。这两个步骤在两个函数中实现。在这里我得到前 10 页，还有 200 页可用。
import requests as rq
from bs4 import BeautifulSoup as bs
from requests.api import head
headers = {"User-Agent": "Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Firefox/78.0"}
def getSummaryData():
data = []
url = "https://www.vesselfinder.com/vessels"
for page in range(1, 10+1, 1): # only 200 first pages autorized ?
print("Page : %d/10" % page)
resp = rq.get(url + "?page=%s" % page, headers=headers)
soup = bs(resp.content, "lxml")
section = soup.find_all('section', {'class', 'listing'})[0]
tbody = section.find_all('tbody')[0]
trs = tbody.find_all('tr')
for tr in trs:
tds = tr.find_all('td')
# column 1 data
sub = tds[1].find('a')
href = sub['href']
divs = sub.find_all('div')
country = divs[0]['title']
sub_divs = divs[1].find_all('div')
vessel_name = sub_divs[0].text
vessel_type = sub_divs[1].text
# column 2 data
build_year = tds[2].text
# column 3 data
gt = tds[3].text
# column 4 data
dwt = tds[4].text
# column 5 data
size = tds[5].text
# save data
tr_data = {'country': country,
'vessel_name': vessel_name,
'vessel_type': vessel_type,
'build_year': build_year,
'gt': gt,
'dwt': dwt,
'size': size,
'href': href}
data.append(tr_data)
return data
def getDetailledData(data):
for (iel, el) in enumerate(data):
print("%d/%d" % (iel+1, len(data)))
url = "https://www.vesselfinder.com" + el['href']
# make get call
resp = rq.get(url, headers=headers)
soup = bs(resp.content, "lxml")
# position and voyage data
table = soup.find_all('table', {'class', 'aparams'})[0]
trs = table.find_all('tr')
labels = ["course_speed", "current_draught","navigation_status",
"position_received", "IMO_MMSI", "callsign", "flag", "length_beam"]
for (i, tr) in enumerate(trs):
td = tr.find_all('td')[1]
el.update({'%s' % labels[i]: td.text})
# vessel particulars
table = soup.find_all('table', {'class', 'tparams'})[0]
trs = table.find_all('tr')
labels = ["IMO_number", "vessel_name", "ship_type", "flag",
"homeport", "gross_tonnage", "summer_deadweight_t",
"length_overall_m", "beam_m", "draught_m", "year_of_built",
"builder", "place_of_built", "yard", "TEU", "crude", "grain",
"bale", "classification_society", "registered_owner", "manager"]
for (i, tr) in enumerate(trs):
td = tr.find_all('td')[1]
el.update({'%s' % labels[i]: td.text})
#break
return data
调用这些函数：
data = getSummaryData() # href include
data = getDetailledData(data)
不要依赖 'class' 标记来定位数据。通常，您需要通过 table -> tbody 然后获取 tds 或 trs 以确保这是正确的。
从某一天开始，我将尝试使用其描述页面从 vesselfinder 中抓取所有船只数据，就像从描述页面中一样，我想要它的信息，例如 table 形式的船只类型、Imo 编号等。我尝试了不同的方法来做到这一点，但仍然有很多错误。首先，我发现我如何通过这些链接到它的描述页面，如何从所有页面获取所有这些链接，以及如何从它的描述页面获取特定的 table 数据（这仍然不完整但得到了一些).
但是今天我尝试同时从所有链接及其描述页面获取数据，它给了我很多错误让我很困惑（通过组合代码）。
我附上了我的代码，这不是很好，但到此为止 #print(len(vessellist)) 它在那之后工作......错误..
import requests
from bs4 import BeautifulSoup
import pandas as pd
headers = {
'user-agent': 'Mozilla/5.0',
'accept-language': 'en-GB,en-US;q=0.9,en;q=0.8',
}
baseurl = 'https://www.vesselfinder.com/vessels'
vessellist = []
for x in range(1,6):
response = requests.get(
f'https://www.vesselfinder.com/vessels?page={x}',
headers=headers)
soup = BeautifulSoup(response.content, 'html.parser')
contents = soup.find_all('td', class_='v2')
for property in contents:
for item in property.find_all('a', href=True):
vessellist.append(baseurl + item['href'])
for link in vessellist:
response = requests.get(link, headers=headers)
soup = BeautifulSoup(response.content, 'html.parser')
table = soup.find('table', class_ = 'tparams')
head = []
for i in table.find_all('td', class_ = 'n3'):
title = i.text
head.append(title)
values =[]
for row in table.find_all('td', class_ = 'v3'):
data = row.text
values.append(data)
df = pd.DataFrame(values)
print(df)
两个步骤：获取摘要数据（包括 href）。接下来获取详细信息。这两个步骤在两个函数中实现。在这里我得到前 10 页，还有 200 页可用。
import requests as rq
from bs4 import BeautifulSoup as bs
from requests.api import head
headers = {"User-Agent": "Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Firefox/78.0"}
def getSummaryData():
data = []
url = "https://www.vesselfinder.com/vessels"
for page in range(1, 10+1, 1): # only 200 first pages autorized ?
print("Page : %d/10" % page)
resp = rq.get(url + "?page=%s" % page, headers=headers)
soup = bs(resp.content, "lxml")
section = soup.find_all('section', {'class', 'listing'})[0]
tbody = section.find_all('tbody')[0]
trs = tbody.find_all('tr')
for tr in trs:
tds = tr.find_all('td')
# column 1 data
sub = tds[1].find('a')
href = sub['href']
divs = sub.find_all('div')
country = divs[0]['title']
sub_divs = divs[1].find_all('div')
vessel_name = sub_divs[0].text
vessel_type = sub_divs[1].text
# column 2 data
build_year = tds[2].text
# column 3 data
gt = tds[3].text
# column 4 data
dwt = tds[4].text
# column 5 data
size = tds[5].text
# save data
tr_data = {'country': country,
'vessel_name': vessel_name,
'vessel_type': vessel_type,
'build_year': build_year,
'gt': gt,
'dwt': dwt,
'size': size,
'href': href}
data.append(tr_data)
return data
def getDetailledData(data):
for (iel, el) in enumerate(data):
print("%d/%d" % (iel+1, len(data)))
url = "https://www.vesselfinder.com" + el['href']
# make get call
resp = rq.get(url, headers=headers)
soup = bs(resp.content, "lxml")
# position and voyage data
table = soup.find_all('table', {'class', 'aparams'})[0]
trs = table.find_all('tr')
labels = ["course_speed", "current_draught","navigation_status",
"position_received", "IMO_MMSI", "callsign", "flag", "length_beam"]
for (i, tr) in enumerate(trs):
td = tr.find_all('td')[1]
el.update({'%s' % labels[i]: td.text})
# vessel particulars
table = soup.find_all('table', {'class', 'tparams'})[0]
trs = table.find_all('tr')
labels = ["IMO_number", "vessel_name", "ship_type", "flag",
"homeport", "gross_tonnage", "summer_deadweight_t",
"length_overall_m", "beam_m", "draught_m", "year_of_built",
"builder", "place_of_built", "yard", "TEU", "crude", "grain",
"bale", "classification_society", "registered_owner", "manager"]
for (i, tr) in enumerate(trs):
td = tr.find_all('td')[1]
el.update({'%s' % labels[i]: td.text})
#break
return data
调用这些函数：
data = getSummaryData() # href include
data = getDetailledData(data)
不要依赖 'class' 标记来定位数据。通常，您需要通过 table -> tbody 然后获取 tds 或 trs 以确保这是正确的。