How to check if a paragraph is bold in python-docx?

Question

Python

Using python-docx I read a paragraph, how can I now check if it is bold?
I tried line.bold // line.run('bold').bold but apparently I'm not reading something from there, in the documentation I found only an example of filling out a document, if you take text from a paragraph, the formatting is reset.

document = docx.Document('test.docx')
line = document.paragraphs[0]