# ModuleNotFoundError: No module named 'flask_migrate'

- **ID:** `python/flask-migrate-command-not-found`
- **Domain:** python
- **Category:** module_error
- **Verification:** ai_generated
- **Fix Rate:** 80%

## Root Cause

Flask-Migrate 扩展未安装

## Version Compatibility

| Version | Status | Introduced | Deprecated |
|---------|--------|------------|------------|
| 3.9 | active | — | — |
| 3.10 | active | — | — |

## Workarounds

1. **安装 Flask-Migrate** (95% success)
   ```
   pip install flask-migrate
   ```
2. **在虚拟环境中安装** (98% success)
   ```
   pip install flask-migrate && pip freeze > requirements.txt
   ```

## Dead Ends

- **安装 Flask-Migrate 但不更新 requirements.txt** — 部署时依赖缺失 (60% fail)
- **手动复制 flask_migrate 文件夹** — 缺少依赖库 (85% fail)