#!/usr/bin/python3

import notmuch

with notmuch.Database() as db:
    query = db.create_query('')
    for msg in query.search_messages():
        try:
            assert msg.get_header('Subject') == 'Hello world!'
            assert msg.get_header('Does-Not-Exist') == ''
        except Exception as exc:
            print(ascii(exc))
        else:
            print('OK')

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