如何解决Python：如何仅打印以特定字符开头的特定字符串？
这里我只想在读取文本文件时打印 epid=1760442729。
我试过了：
result = []`
with open('deals.txt','r') as f:
for line in f:
if line.startswith('?epid='):
break
result.append(line)
print(result[0].split('epid='))
但我没有得到预期的结果。
任何帮助或建议都会对我有所帮助。 提前致谢
解决方法
import re
s = """https://www.ebay.com/itm/Egyptian-Comfort-1800-Count-4-Piece-Bed-Sheet-Set-Deep-Pocket-Bed-Sheets/142436469971?epid=1760442729&hash=item2129e00cd3%3Ag%3A7gIAAOSw3YBdRVJd&_trkparms=%2526rpp_cid%253D601435485fceeb223c6f4511&var=442541824291
https://www.ebay.com/itm/Egyptian-Comfort-1800-Count-4-Piece-Bed-Sheet-Set-Deep-Pocket-Bed-Sheets/142436469971?epid=172442729&hash=item2129e00cd3%3Ag%3A7gIAAOSw3YBdRVJd&_trkparms=%2526rpp_cid%253D601435485fceeb223c6f4511&var=442541824291"""
for i in re.findall(r'epid=(\d+)&',s,re.MULTILINE):
print(f'epid = {i}')
epid = 1760442729
epid = 172442729
如果总是使用相同的结构，我会用子字符串来做
result = []
with open('deals.txt','r') as f:
for line in f:
a= line.find('epid=')
b= line.find('&hash=')
print(line[a:b])
result.append(line)
使用旨在解析 URL 的库。
示例：
from urllib.parse import urlparse,parse_qs
URL='https://www.ebay.com/itm/Egyptian-Comfort-1800-Count-4-Piece-Bed-Sheet-Set-Deep-Pocket-Bed-Sheets/142436469971?epid=1760442729&hash=item2129e00cd3%3Ag%3A7gIAAOSw3YBdRVJd&_trkparms=%2526rpp_cid%253D601435485fceeb223c6f4511&var=442541824291'
url_component = urlparse(URL)
query_component = parse_qs(url_component.query)
epid_data = query_component['epid'][0]
print(f'epid = {epid_data}')
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