context lib management

context.py

from contextlib import ContextDecorator

class makeparagraph(ContextDecorator):
    def __enter__(self):
        print('<p>')
        return self

    def __exit__(self, *exc):
        print('</p>')
        return False

@makeparagraph()
def emit_html():
    print('Here is some non-HTML')

emit_html()

Here is some non-HTML

<p>
Here is some non-HTML
</p>