I pip-installed chameleon with Jython 2.7.4.
The version chosen by pip was 3.10.2.
I created this sample python file:

from chameleon import PageTemplate

template = PageTemplate("<div>Hello, ${name}.</div>")
result = template(name="John")
print(result)

But I get this error:

Is it something I should report to the Chameleon team?
Or is it a bug related to Jython itself?