---
---


### Environment variables
```python
import os
os.environ.get('HOME')
```

---
---


### Environment variables
```python
import os
os.environ.get('HOME')
```

### Local files
```python
import os
os.listdir(path)
os.path.join(folder_name, file_name)
os.path.isfile(node_path)
```

Add python note: dealing with files
Add python note: dealing with files
