Problem report: https://runestone.academy/ns/books/published/wakeforest_py4eint_fall26/lists_parsing-lines.html
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Assessment
- Difficulty
- 2/5
- Estimated time
- 1-3 hours
- Newbie friendliness
- 65/100
Research direction
Start with the reported lists_parsing-lines.html page and its py4eint_2_listParsing activecode exercise; run the example that opens mboxShort.txt. Check how the exercise gets its input file and whether that file is available in the course. Done means the exercise runs without the reported file-not-found error.
Written by the indexing model from the issue text.
Description
A problem was reported through the Runestone "Report a Problem" form.
| Field | Value |
|---|---|
| Reporter | [email protected] |
| [email protected] | |
| Course | wakeforest_py4eint_fall26 |
| Page | https://runestone.academy/ns/books/published/wakeforest_py4eint_fall26/lists_parsing-lines.html |
| Reported at | 2026-10-06T17:10:19.753935 |
Description
When I run any exercise with "fhand = open('mboxShort.txt')", I get the error
OSError: [Errno 2] No such file or directory: 'mboxShort.txt' on line 1
in the py4e-int book
Browser console log
[log] Timezone cookie matches, not sending timezone to server
[log] This page served by undefined
[log] triggering runestone:pre-login-complete
[log] Runestone pre-login complete
[log] Loading Runestone component: activecode
[log] Loading Runestone component: fillintheblank
[log] Loading Runestone component: parsons
[log] before get hist
[log] before get hist
[log] adding video popouts
[log] setting up pretext
[log] SpliceWrapper: received message subject: undefined from iframe: unknown
[log] Response from server: 200
[log] Response from server: 200
[log] making a new scrubber
[log] Fake change event, skipping the log
[log] Data from server: {"answer":"[\"split\"]","correct":true,"percent":1,"timestamp":"2026-10-06T16:39:26.554047+00:00","div_id":"py4eint_2_listPars_fill1","sid":"[email protected]","course_name":"wakeforest_py4eint_fall26","id":11834949} calling repopulateFromStorage
[log] resolving checkServer with server data
[log] Data from server: {"answer":"0_0-1_0-3_1-5_1-6_1-7_1","source":"4_0-2_0-8_0","correct":true,"percent":1,"timestamp":"2026-10-06T16:40:31.892378+00:00","div_id":"py4eint_2_listPars_PP_file","sid":"[email protected]","course_name":"wakeforest_py4eint_fall26","id":31344122} calling repopulateFromStorage
[log] resolving checkServer with server data
[log] making a new scrubber
[log] Fake change event, skipping the log
[log] MathJax Ready -- dequeing a typesetting run for undefined
[log] MathJax Ready -- dequeing a typesetting run for undefined
[log] MathJax Ready -- dequeing a typesetting run for py4eint_2_listPars_fill1_feedback undefined
[log] starting runProg
[log] {"args":{"v":[{"$mangled":"[Errno 2] No such file or directory: 'mboxShort.txt'","$savedKeyHash":"[Errno 2] No such file or directory: 'mboxShort.txt'","v":"[Errno 2] No such file or directory: 'mboxShort.txt'","$hash":-1}],"in$repr":false},"traceback":[{"lineno":1,"colno":0,"filename":"<stdin>.py"}],"cause":null,"context":null,"$d":{"size":0,"entries":{},"buckets":{},"in$repr":false,"$version":0}}
[log] running {"div_id":"py4eint_2_listParsing","code":"fhand = open('mboxShort.txt')\nfor line in fhand:\n line = line.rstrip()\n if not line.startswith('From '): continue\n words = line.split()\n print(words[2])\n\n# Continue is used here to skip the rest of the line if it doesn't start with \"From \"\n","language":"python","errinfo":"OSError: [Errno 2] No such file or directory: 'mboxShort.txt' on line 1","to_save":"False","prefix":"","partner":"","editDist":0,"changesPerSecond":null,"course":"wakeforest_py4eint_fall26","clientLoginStatus":true,"timezoneoffset":4}
- Dominant language
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- Forks
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- Avg merge
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- Merged PRs (30d)
- 19
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