从 Beautifulsoup 标签中提取 src答案

【问题标题】：Extracting src from Beautifulsoup Tag从 Beautifulsoup 标签中提取 src
【发布时间】：2016-10-29 10:31:14
【问题描述】：

我试图使用 beautifulsoup 来获取 newegg 的产品名称、描述、价格和图片。我有以下 bs4.element.Tag 类型，我想从标签中提取“src”链接。以下是我的标签：

df = <a class="itemImage" href="http://www.newegg.com/Product/Product.aspx?Item=N82E16875169194&amp;cm_re=Samsung_edge-_-75-169-194-_-Product" id="img_75-169-194" title='Samsung Galaxy S7 Edge Dual SIM Unlocked Smart Phone, Dual Edge 5.5" AMOLED Display, black Color, 32GB Storage 4GB RAM International Version - No US Warranty'>\n<img alt='Samsung Galaxy S7 Edge Dual SIM Unlocked Smart Phone, Dual Edge 5.5" AMOLED Display, black Color, 32GB Storage 4GB RAM International Version - No US Warranty' src="http://images10.newegg.com/ProductImageCompressAll200/75-169-194-04.jpg" title='Samsung Galaxy S7 Edge Dual SIM Unlocked Smart Phone, Dual Edge 5.5" AMOLED Display, black Color, 32GB Storage 4GB RAM International Version - No US Warranty'/>\n</a>

如何提取

src="http://images10.newegg.com/ProductImageCompressAll200/75-169-194-04.jpg"

来自这个标签？我试过了

df.attrs['src']

但我收到了 Keyerror。

【问题讨论】：

标签： python-2.7 beautifulsoup

【解决方案1】：

src在img标签中：

from bs4 import BeautifulSoup
tag = """<a class="itemImage" href="http://www.newegg.com/Product/Product.aspx?Item=N82E16875169194&amp;cm_re=Samsung_edge-_-75-169-194-_-Product" id="img_75-169-194" title='Samsung Galaxy S7 Edge Dual SIM Unlocked Smart Phone, Dual Edge 5.5" AMOLED Display, black Color, 32GB Storage 4GB RAM International Version - No US Warranty'>\n<img alt='Samsung Galaxy S7 Edge Dual SIM Unlocked Smart Phone, Dual Edge 5.5" AMOLED Display, black Color, 32GB Storage 4GB RAM International Version - No US Warranty' src="http://images10.newegg.com/ProductImageCompressAll200/75-169-194-04.jpg" title='Samsung Galaxy S7 Edge Dual SIM Unlocked Smart Phone, Dual Edge 5.5" AMOLED Display, black Color, 32GB Storage 4GB RAM International Version - No US Warranty'/>\n</a>"""

soup = BeautifulSoup(tag,"lxml")

src = soup.img["src"]

这会给你：

http://images10.newegg.com/ProductImageCompressAll200/75-169-194-04.jpg

【讨论】：

【解决方案2】：

在python中尝试正则表达式参考
https://docs.python.org/2/library/re.html

import re
s = """
    <a class="itemImage" href="http://www.newegg.com/Product/Product.aspx?Item=N82E16875169194&amp;cm_re=Samsung_edge-_-75-169-194-_-Product" id="img_75-169-194" title='Samsung Galaxy S7 Edge Dual SIM Unlocked Smart Phone, Dual Edge 5.5" AMOLED Display, black Color, 32GB Storage 4GB RAM International Version - No US Warranty'>\n<img alt='Samsung Galaxy S7 Edge Dual SIM Unlocked Smart Phone, Dual Edge 5.5" AMOLED Display, black Color, 32GB Storage 4GB RAM International Version - No US Warranty' src="http://images10.newegg.com/ProductImageCompressAll200/75-169-194-04.jpg" title='Samsung Galaxy S7 Edge Dual SIM Unlocked Smart Phone, Dual Edge 5.5" AMOLED Display, black Color, 32GB Storage 4GB RAM International Version - No US Warranty'/>\n</a>
    """
src_list = re.findall("src=[^\s]*", s)

输出：

src_list = ['src="http://images10.newegg.com/ProductImageCompressAll200/75-169-194-04.jpg"']

【讨论】：