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Editorial Team
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Asked: 2026-05-26T17:43:33+00:00

So I have this table, and I want to go through in Python, and

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So I have this table, and I want to go through in Python, and find all of the <tr> tags, and turn them into <tr id="NUMBER HERE"> where the number will be a number from a list which is in this format:

['1', '2', '3', '4', '5', '6', '7', '8', '9', '10', '11', '12', '13', '14', '15', '16', '17', '18', '19', '20', '47']

What is the best way to do this?

So basically, the first <tr> would become <tr id="1"> the second would become <tr id="2">, etc.

It is NOT always sequential, as you can see from it going from 20 to 47.

The table is stored as a string.

I should specify, currently, it is a string with multiple tags, i.e. <html><table><tr>blah</tr><tr>blahblah</tr></table></html> – VERY oversimplified. I want it to search for the instances of <tr> in the string and replace each with <tr id="NUMBER">, based on the position of the tr versus the next number in the list.

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1 Answer

  1. Editorial Team

    Using lxml:

    import lxml.html as LH

html_table='''
<table>
<tr>
<tr>
<tr>
<tr>
<tr>
</table>
'''

nums=['1','2','20','47','50']
doc=LH.fromstring(html_table)
for tr,n in zip(doc.xpath('//tr'),nums):
    tr.attrib['id']=n
print(LH.tostring(doc,pretty_print=True))

    yields

    <table>
<tr id="1"></tr>
<tr id="2"></tr>
<tr id="20"></tr>
<tr id="47"></tr>
<tr id="50"></tr>
</table>
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