Interactive interpreter prints wrong lines in exception traceback when PYTHON_BASIC_REPL=1 and startup file is loaded

[schuelermine]

Bug report

Bug description:

1. Create a Python file ./startup.py:

   # Python startup file LINE 1
   # Python startup file LINE 2

2. Run PYTHONSTARTUP=./startup.py PYTHON_BASIC_REPL=1 python3
3. Run

   >>> undefined

   Expected output:

   Traceback (most recent call last):
     File "<stdin>", line 1, in <module>
       undefined
   NameError: name 'undefined' is not defined
   

   Actual output:

   Traceback (most recent call last):
     File "<stdin>", line 1, in <module>
       # Python startup file LINE 1
   NameError: name 'undefined' is not defined
   

4. Run

   >>> while True:
   ...     undefined

   Expected output:

   Traceback (most recent call last):
     File "<stdin>", line 2, in <module>
       undefined
   NameError: name 'undefined' is not defined
   

   Actual output:

   Traceback (most recent call last):
     File "<stdin>", line 2, in <module>
       # Python startup file LINE 2
   NameError: name 'undefined' is not defined
   

5. Run

   >>> while True:
   ...     pass
   ...     undefined

   Here, the output is correct and as expected:

   Traceback (most recent call last):
     File "<stdin>", line 3, in <module>
       undefined
   NameError: name 'undefined' is not defined
   

CPython versions tested on:

3.13

Operating systems tested on:

Linux

[picnixz]

Thanks but this is a known issue that was fixed for the next release.

[schuelermine]

@picnixz Thanks. GitHub needs to improve their search. I searched for issues on this, and didn’t find any.

[picnixz]

Some tips:

• search in closed issues (by default, the search is on open issues I think)
• search with labels if you know which topic you're looking for (it might help)
• only use simple keywords (in this case PYTHONSTARTUP would have been a good keyword)

[schuelermine]

I did search in all issues, open and closed. Here is the exact query I used: https://github.com/python/cpython/issues?q=is%3Aissue%20basic%20repl%20startup%20file%20error

[schuelermine]

GitHub is quite clearly not doing search well, given that searching Google for “python cpython github issue basic repl startup file error” lists the relevant issue as the first result, while GitHub doesn’t show it at all

[picnixz]

Here is the exact query I used

From my own experience, using too many words is usually badly handled on GH side as the search also parses the comments (I think?). In the future, if you have some specific words (such as PYTHONSTARTUP), it would be better to use them alone (also when there are underscores or spaces, GitHub is very bad at understanding them, even when quoting them). For instance I would advise not using the "error" term as you could get many false positives, and try to use terms that are unlikely to appear in other titles (e.g., a function name, an environment variable, a specific Python term)