MLOps Code Syntax Reference Hub
The developer's cheat sheet for critical syntax: data types, HTTP status, Git commands, and file permissions.
API Data Type Mapping Reference
Ensure seamless data transfer between Python backends (ML), JSON payloads, and SQL databases.
| Concept | Python (ML/Pandas) | JSON (API Payload) | SQL (PostgreSQL/MySQL) |
|---|---|---|---|
| Text/String | `str` | `string` | `VARCHAR(255)`, `TEXT` |
| Integer | `int`, `np.int64` | `number` (integer) | `INT`, `BIGINT` |
| Floating Point | `float`, `np.float64` | `number` (float) | `FLOAT`, `DOUBLE PRECISION` |
| Boolean | `bool` | `boolean` | `BOOLEAN` |
| List / Array | `list`, `np.array` | `array` | `JSONB` (PostgreSQL), `VARCHAR` (Serialized) |
| Timestamp / Date | `datetime` | `string` (ISO 8601) | `TIMESTAMP WITH TIME ZONE` |
Essential HTTP Status Codes for API Debugging
Quickly diagnose service health and failure causes when debugging MLOps pipelines.
| Code | Category | Name | Common Cause (API/ML Context) |
|---|---|---|---|
| **200** | Success | OK | Standard successful inference or data retrieval. |
| **201** | Success | Created | Successfully logged a new model artifact or experiment result. |
| **400** | Client Error | Bad Request | Malformed JSON input payload (e.g., missing required field). |
| **401** | Client Error | Unauthorized | Missing or invalid API key/access token. |
| **403** | Client Error | Forbidden | Authorization failed; user lacks permission for the requested resource. |
| **404** | Client Error | Not Found | Endpoint URL or specific requested model version does not exist. |
| **429** | Client Error | Too Many Requests | Rate limit exceeded. Client must implement backoff strategy. |
| **500** | Server Error | Internal Server Error | Model crash or unhandled code exception on the server side. |
| **503** | Server Error | Service Unavailable | Server overloaded or container deployment still initializing. |
| **504** | Server Error | Gateway Timeout | Inference took longer than the allocated proxy timeout (needs model optimization). |
Git Survival Guide: Conflict Resolution
Essential commands for cleaning up history and resolving merge conflicts in collaborative coding projects.
# 1. Check current status
git status
# 2. View conflicting files and differences
git diff
# 3. Use local changes, discarding remote changes
git checkout --ours <file-path>
git add <file-path>
# 4. Use remote changes, discarding local changes
git checkout --theirs <file-path>
git add <file-path>
# 5. Finish the merge after resolving conflicts manually
git commit -m "Merge resolved"
# 6. Abort an ongoing merge
git merge --abort
Linux File Permissions (chmod) Cheat Sheet
Quick reference for setting file execution and access rights in Docker containers and remote servers.
| Symbolic Permission | Octal Code | Meaning |
|---|---|---|
| `---` | `000` | No permissions whatsoever. |
| `rwx` | `777` | Read, Write, and Execute for User, Group, and Others. |
| `rwxr-xr-x` | `755` | User can R, W, X. Group and Others can only R, X. (Standard directory permission) |
| `rw-r--r--` | `644` | User can R, W. Group and Others can only R. (Standard file permission) |
| `rwx------` | `700` | Owner has full access. No access for Group or Others. (Secure files) |
**Octal Structure:** [User] [Group] [Others]. For example, `755` means User=`7` (R+W+X), Group=`5` (R+X), Others=`5` (R+X).
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