check that your handling of global variables in a Jupyter notebook is clean

assert_ipython_globals_managed.py

import inspect
from IPython.display import display, HTML

def html(s):
    return display(HTML(s))

def ok(message="OK"):
    html(f"<div class=\"alert alert-block alert-success\">{message}</div>")

def _acceptable_global(name, value):
    """Returns True if a global variable with name/value can be safely ignored"""
    return (
        # stuff that's normal to share everywhere
        inspect.isroutine(value) or
        inspect.isclass(value) or
        inspect.ismodule(value) or
        # leading underscore marks private variables
        name.startswith('_') or
        # all-caps names indicate constants
        name.upper() == name or
        # ignore IPython stuff
        name in {'In', 'Out'} or 
        getattr(value, '__module__', '').startswith('IPython'))

def assert_globals_clean():
    """Raises an assertion error if there are unmanaged global variables.
       Variables that are considered 'managed' include those formatted with 
       ALL_CAPS (constants), _a_leading_underscore (recognized as a global but at
       least indicated as private to the cell), classes and modules, automatic
       imports from IPython, and functions generally."""
    unmanaged_globals = {k:type(v) for k, v in globals().items() if not _acceptable_global(k, v)}
    if unmanaged_globals != {}:
        raise AssertionError(f"Unmanaged globals found: {unmanaged_globals}")
    ok("No unmanaged globals detected")