Robert Reynolds added the comment:
A pure python demonstration of the problem looks like this (`__file__` stores
the path to the executed module):
```python
with open(__file__) as f:
src = f.read()
with open(__file__, 'w') as f:
f.write('\n\n\n\n\n# Whoops! Wrong line!\n
Robert Reynolds added the comment:
I second [what was said by Aigars
Mahinovs](https://bugs.python.org/issue8087#msg300990) about long-running
processes giving confusing tracebacks that make debugging very difficult. I
have a Natural Language Processing pipeline extracting features from
