crypdick Python Heredoc Pattern
Run Python via Bash? Never python -c "..." beyond trivial one-liners. Shell quoting break on f-strings, apostrophes, nested quotes, escape sequences.
Use heredoc syntax instead
uv run python << 'PYTHON_CODE'
import json
data = {"name": "it's working", "value": f"{1 + 2}"}
print(json.dumps(data, indent=2))
PYTHON_CODE
Single quotes round 'PYTHON_CODE' block shell var expansion. $variables and backticks stay literal Python.
With dependencies
uv run --with requests python << 'PYTHON_CODE'
import requests
resp = requests.get("https://api.example.com/data")
print(resp.json())
PYTHON_CODE
Rules
- Always
uv run python(not barepythonorpython3) - Always quote delimiter:
<< 'PYTHON_CODE'(not<< PYTHON_CODE) - Closing
PYTHON_CODEown line, no leading whitespace - Never
python -cfor code with quotes, f-strings, multiple statements