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Issue title
`self.at` used but never assigned in __init__
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Issue body (markdown)
## Code-quality scan: `microsoft/ML-For-Beginners`
**Score: 73/100 (C+)** · 52 findings · scanned 2026-06-05 07:18 UTC · 1,664 LOC
| Severity | Count |
|---|---|
| CRITICAL | 2 |
| HIGH | 31 |
| MEDIUM | 8 |
| LOW | 8 |
📊 [Full filterable report](https://repobility.com/scan/376b2a43-5726-48d6-a401-647c50cf2472/) · 
### Top findings
1. **CRITICAL** `MINED030` — Python Pickle Loads
`3-Web-App/1-Web-App/solution/web-app/app.py:7` · CWE-502 · ✓ Repobility
2. **CRITICAL** `SEC081` — Python: pickle.loads / marshal.loads on untrusted data
`3-Web-App/1-Web-App/solution/web-app/app.py:7` · A05:2021 Security Misconfiguration
3. **HIGH** `MINED108` — `self.image` used but never assigned in __init__
`8-Reinforcement/1-QLearning/solution/rlboard.py:172` · ✓ Repobility
4. **HIGH** `MINED108` — `self.image` used but never assigned in __init__
`8-Reinforcement/1-QLearning/solution/rlboard.py:169` · ✓ Repobility
5. **HIGH** `MINED108` — `self.at` used but never assigned in __init__
`8-Reinforcement/1-QLearning/solution/rlboard.py:124` · ✓ Repobility
---
**Security note**: this issue is public. If any flagged finding is a real, exploitable vulnerability, please redirect to your `SECURITY.md` policy or open a [private security advisory](https://docs.github.com/en/code-security/security-advisories/guidance-on-reporting-and-writing-information-about-vulnerabilities/privately-reporting-a-security-vulnerability) instead. We're happy to close this and re-submit privately.
---
_Filed automatically. Close this issue if not useful — we won't refile. Full report: https://repobility.com/scan/376b2a43-5726-48d6-a401-647c50cf2472/_
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Already filed
This repo publishes a SECURITY.md policy and the scan contains 2 Critical/High security finding(s). Public issue filing would violate coordinated disclosure. Submit privately via the project's security reporting channel.
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