Use curly braces instead of indenting, plus much more sugar added to Python's syntax.
Python Brackets Kernel for Jupyter
Bridge for Python (Bridge is a light-weight portable Natural Language Processing Library)
Use json to serialize unsupported python types (and many more including functions, classes, exceptions, etc). [stable-py2-py3].
Object Oriented HTML Construction Toolkit for Python
Use c-style braces instead of indentation.