app.py

from PyPDFForm.middleware.checkbox import Checkbox

if __name__ == '__main__':
    import json

    from PyPDF2 import PdfReader

    form = PdfReader("form.pdf")
    checkboxes = [v.name for k,v in form.get_fields().items() if v.field_type == "/Btn" and v.value == "/Yes"]
    print(checkboxes)