Context manager

JSONFile implements __enter__/__exit__. By default it saves automatically on a clean exit (no exception). You can disable this by passing auto_save=False.

from singlejson import JSONFile

# Auto-save on clean exit
with JSONFile("data.json", default_data={}) as jf:
    jf.json["counter"] = 1

# No auto-save
with JSONFile("scratch.json", default_data={}, auto_save=False) as jf:
    jf.json["tmp"] = True