Python code can commonly contain characters that are invalid XML, such
as '<' and '>'. This has proven to be a pain point for instructors
implementing custom Python grading functions for their JSInput problems
(see sample code below).
This change creates a more robust template from which to make
modifications.
```python
# This is an XML syntax error, when not inside a CDATA section.
if i < 0:
print('negative')
```
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