"In python do you generally use PEP 8 -- Style Guide for Python Code as your coding standards/guidelines? Are there any other formalized standards that you prefer?"
As mentioned by you follow PEP 8 for the main text, and PEP 257 for docstring conventions
Along with Python Style Guides, I suggest that you refer the following:
- Code Like a Pythonista: Idiomatic Python
- Common mistakes and Warts
- How not to write Python code
- Python gotcha