Python初学者,首先尝试使用CSV模块导出刮擦结果。有问题的脚本会返回几个表元素,只对" price"和" mfr-no"对于每个退回的产品。基本上只需要为这些相应元素中的每一个提供2列。
我确定在尝试写csv时我做了一些根本性的错误,只是不确定是什么。我的桌面上有一个空的.csv文件名为" test"我试图写一切,并且我试图复制其他的#34;写入csv" SE上的例子无济于事。任何意见都表示赞赏。
from bs4 import BeautifulSoup
import csv
import requests
csvfile = "test.csv"
url = "http://www.dabs.com/category/computing/11001"
base_url = "http://www.dabs.com"
page_array = []
html = requests.get(url)
soup = BeautifulSoup(html.content, "html.parser")
Product_table = soup.findAll("table")
Products = Product_table[0].findAll("tr")
if len(soup.findAll('tr')) > 0:
Products = Products[1:]
for row in Products:
cells = row.find_all('td')
data = {
'description' : cells[0].get_text(),
'price' : cells[1].get_text()
}
print row
with open(csvfile, row) as csvfile:
link_writer = csv.writer(csvfile)
for val in row:
link_writer.writerow(val)
答案 0 :(得分:2)
你需要打开写作而不是传递一个可迭代:
with open(csvfile, "w") as csvfile: # w opens for writing
如果你想从循环中写出项目,你应该在外面打开并写入循环:
with open(csvfile, "w") as csvfile:
link_writer = csv.writer(csvfile)
for row in Products:
cells = row.find_all('td')
data = {
'description' : cells[0].get_text(),
'price' : cells[1].get_text()
}
# write what you need
你的代码也找不到任何东西,以获得制造商数量和价格:
html = requests.get(url)
soup = BeautifulSoup(html.content, "html.parser")
product_table = soup.find("table")
tds = product_table.find_all('td')
with open(csvfile, "w") as csvfile:
link_writer = csv.writer(csvfile)
for tag in tds:
mfr = tag.find("span")
if mfr:
print(mfr.text)
Mfr#: FK3-UK
£30.00
Mfr#: PDW0AE-00900PEN
£99.99
Mfr#: FORCE K7
£39.99
Mfr#: X551MAV-BING-SX1017B
£229.99
Mfr#: VE228TR
£79.99
Mfr#: QQ2-00038
£59.94
Mfr#: M6900
£18.00
Mfr#: MCB4370500C2/04/1
£51.39
Mfr#: 79G-03549
£94.99
Mfr#: FQC-08289
£113.18
Mfr#: WN7-00614
£76.32
Mfr#: GFC-02733
£69.99
Mfr#: 2LF-00021
£19.78
Mfr#: T5D-01574
£169.72
Mfr#: X555LA-XX273H
£399.99
Mfr#: FQC-06949
£109.99
Mfr#: 10DR000TUK
£279.99
Mfr#: 10AW008NUK
£268.44
Mfr#: MCF3QUK
£179.98
Mfr#: K3X03EA#ABU
£253.45
Mfr#: 10DR001EUK
£348.82
Mfr#: 9H.LA2LB.DPE
£76.41
Mfr#: 51MF1600AA001
£29.98
Mfr#: G7V83EA REFURB
£199.99
Mfr#: 62151
£27.99
所以创建一个以mfr-nr为关键字,价格为值的字典:
product_table = soup.find("table")
tds = product_table.find_all('td')
data = []
for tag in tds:
mfr = tag.find("span")
if mfr: # make sure we have test to get
data.append(mfr.text)
it = iter(data) # create iterator
# will create key/value pairings by getting every second element as key and every second element as value starting from 0 and 1 respectively.
data_dict = dict(zip(it, it))
print(data_dict)
{'Mfr#: FQC-08289': '£113.18', 'Mfr#: 62151': '£27.99', 'Mfr#: VE228TR': '£79.99', 'Mfr#: GFC-02733': '£69.99', 'Mfr#: FK3-UK': '£30.00', 'Mfr#: WN7-00614': '£76.32', 'Mfr#: 10DR001EUK': '£348.82', 'Mfr#: 51MF1600AA001': '£29.98', 'Mfr#: FORCE K7': '£39.99', 'Mfr#: 10DR000TUK': '£279.99', 'Mfr#: 2LF-00021': '£19.78', 'Mfr#: M6900': '£18.00', 'Mfr#: T5D-01574': '£169.72', 'Mfr#: MCB4370500C2/04/1': '£51.39', 'Mfr#: 10AW008NUK': '£268.44', 'Mfr#: PDW0AE-00900PEN': '£99.99', 'Mfr#: G7V83EA REFURB': '£199.99', 'Mfr#: 79G-03549': '£94.99', 'Mfr#: K3X03EA#ABU': '£253.45', 'Mfr#: FQC-06949': '£109.99', 'Mfr#: X551MAV-BING-SX1017B': '£229.99', 'Mfr#: X555LA-XX273H': '£399.99', 'Mfr#: QQ2-00038': '£59.94', 'Mfr#: MCF3QUK': '£179.98', 'Mfr#: 9H.LA2LB.DPE': '£76.41'}
最后写到csv:
with open(csvfile, "w") as csvfile:
link_writer = csv.writer(csvfile)
for tup in data_dict.items():
link_writer.writerow(tup) # write key and value mfr/price in each column
其中输出以下内容:
Mfr#: 10DR001EUK,£348.82
Mfr#: WN7-00614,£76.32
Mfr#: FQC-06949,£109.99
Mfr#: 2LF-00021,£19.78
Mfr#: MCB4370500C2/04/1,£51.39
Mfr#: PDW0AE-00900PEN,£99.99
Mfr#: GFC-02733,£69.99
Mfr#: G7V83EA REFURB,£199.99
Mfr#: X555LA-XX273H,£399.99
Mfr#: FK3-UK,£30.00
Mfr#: QQ2-00038,£59.94
Mfr#: T5D-01574,£169.72
Mfr#: 51MF1600AA001,£29.98
Mfr#: 62151,£27.99
Mfr#: FQC-08289,£113.18
Mfr#: K3X03EA#ABU,£253.45
Mfr#: VE228TR,£79.99
Mfr#: 9H.LA2LB.DPE,£76.41
Mfr#: 10DR000TUK,£279.99
Mfr#: FORCE K7,£39.99
Mfr#: X551MAV-BING-SX1017B,£229.99
Mfr#: 10AW008NUK,£268.44
Mfr#: MCF3QUK,£179.98
Mfr#: 79G-03549,£94.99
Mfr#: M6900,£18.00
如果您不想在输出中使用Mfr#:
部分,请使用str.split:
data = []
for tag in tds:
mfr = tag.find("span")
if mfr:
data.append(mfr.text.split(":")[-1].strip())
所以你的csv看起来像是:
FK3-UK,£30.00
2LF-00021,£19.78
G7V83EA REFURB,£199.99
T5D-01574,£169.72
FQC-06949,£109.99
10DR001EUK,£348.82
FQC-08289,£113.18
M6900,£18.00
10DR000TUK,£279.99
VE228TR,£79.99
WN7-00614,£76.32
62151,£27.99
MCF3QUK,£179.98
FORCE K7,£39.99
51MF1600AA001,£29.98
X551MAV-BING-SX1017B,£229.99
GFC-02733,£69.99
9H.LA2LB.DPE,£76.41
79G-03549,£94.99
QQ2-00038,£59.94
PDW0AE-00900PEN,£99.99
K3X03EA#ABU,£253.45
MCB4370500C2/04/1,£51.39
10AW008NUK,£268.44
X555LA-XX273H,£399.99