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Editorial Team
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Asked: 2026-05-28T14:02:01+00:00

I am working with a HTML application with Python. I usually use the %

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I am working with a HTML application with Python. I usually use the % sign to indicate that I’m using a Python element, and never had a problem with that before.

Now, I am using some tables which I’m trying to control their size bye the percentage using the % sign. So now the Python does not show the Python elements.

Here is some code to explain myself:

<table width="90%">
<tr>
<td width="60%">HELLO</td>
<td width="40%">GOOD BYE</td>
</tr>
</table>

<input type="button" value="BUTTON" onclick="function(%s)" /> ''' % variable

The error that I am having says

unsupported format character ‘”‘ (0x22) at index 19″

making reference to the %s string in the onclick=function(%s)

Does someone know if the % sign in the tables affects Python or something like that?

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1 Answer

  1. Editorial Team

    You need to escape ‘%’ as ‘%%’ in python strings. The error message you’re getting probably is about the other percent signs. If you put only single percent sign in a string python thinks it will be followed by a format character and will try to do a variable substitution there.

    In your case you should have:

    '''

....
<table width="90%%">
<tr>
<td width="60%%">HELLO</td>
<td width="40%%">GOOD BYE</td>
</tr>
</table>

<input type="button" value="BUTTON" onclick="function(%s)" /> ''' % variable
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