能够从一大堆字符中规范提取字符串是python语言中的基本技能之一。尤其是在使用python爬取网页数据时，规范提取字符串技术直接决定爬取数据的成败和效率。这里给大家分享一个仅用三行代码提取网址数据的方法。
以下是数据源
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f='../../../n30888572/n31109385/n31125884/index_31131703_25.html'></a><a href='../../../n30888572\
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703_46.html'></a><a href='../../../n30888572/n31109385/n31125884/index_31131703_47.html'></a><a h\
ref='../../../n30888572/n31109385/n31125884/index_31131703_48.html'></a><a href='../../../n308885\
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tml'></a><a href='../../../n30888572/n31109385/n31125884/index_31131703_52.html'></a><a href='../\
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><a href='../../../n30888572/n31109385/n31125884/index_31131703_57.html'></a><a href='../../../n3\
0888572/n31109385/n31125884/index_31131703_58.html'></a><a href='../../../n30888572/n31109385/n31\
125884/index_31131703_59.html'></a><a href='../../../n30888572/n31109385/n31125884/index_31131703\
_60.html'></a><a href='../../../n30888572/n31109385/n31125884/index_31131703_61.html'></a><a href\
='../../../n30888572/n31109385/n31125884/index_31131703_62.html'></a><a href='../../../n30888572/\
n31109385/n31125884/index_31131703_63.html'></a><a href='../../../n30888572/n31109385/n31125884/i\
ndex_31131703_64.html'></a><a href='../../../n30888572/n31109385/n31125884/index_31131703_65.html\
'></a><a href='../../../n30888572/n31109385/n31125884/index_31131703_66.html'></a><a href='../../\
../n30888572/n31109385/n31125884/index_31131703_67.html'></a></div>"我们需要从数据源中提取出全部类似以下格式的数据
<a href='../../../n30888572/n31109385/n31125884/index_31131703_52.html'></a>规范提取字符串数据，确定分割点是关键，这里我们把<a作为分割点
ff = wd.split('<a')遍历输出提取的字符串
for i in ff:
nf = '<a>'+i
print(nf)运行代码，输出提取结果(为节省资源，输出结果省略了中间几十行），其中第1行和最后一行不符合提取内容，请自己动手做进一步处理，或者在评论区留言。
