How do I print a Python variable as an attribute value for XML file

Question

Python Version 3.6.8

import xml.etree.cElementTree as ET

Following is the code to generate XML file, XML file generation code is working fine. I need to write some values from variables. Variables are i, height and width.

frame = ET.SubElement(root, "frame", number="{i}")
objectlist = ET.SubElement(frame, "objectlist")
object = ET.SubElement(objectlist, "object", id="1")
ET.SubElement(object, "box", h="{height}", w="{width}")

How can I pass the variables in the given code? (First Line of Code and fourth line of code)

mpiskore · Accepted Answer · 2019-12-16 22:11:53Z

2

First, please specify all the valuable information like version of Python and what is the library you are using (ET).

If this code is in Python 3.6 or later the most intuitive way would be to use f-strings, which would be in your case:

frame = ET.SubElement(root, "frame", number=f"{i}"

(Note how the only change is f before the value of number)

You can do the same with any other string value.

Another way to achieve this would be to cast the value of i to string using str(i), which will work the same but will lack the efficiency of f-strings.

answered Dec 16, 2019 at 22:11

mpiskore

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