demonstrate a pdfrw problem

sample.py

import os
import pdfrw

INVOICE_TEMPLATE_PATH = 'sample-template.pdf'
INVOICE_OUTPUT_PATH = 'sample-output.pdf'

ANNOT_KEY = '/Annots'
ANNOT_FIELD_KEY = '/T'
ANNOT_VAL_KEY = '/V'
ANNOT_RECT_KEY = '/Rect'
SUBTYPE_KEY = '/Subtype'
WIDGET_SUBTYPE_KEY = '/Widget'

def write_fillable_pdf(input_pdf_path, output_pdf_path, data_dict):
    template_pdf = pdfrw.PdfReader(input_pdf_path)

    for page in template_pdf.pages:
        annotations = page[ANNOT_KEY]
        for annotation in annotations:
            if annotation[SUBTYPE_KEY] == WIDGET_SUBTYPE_KEY:
                if annotation[ANNOT_FIELD_KEY]:
                    key = annotation[ANNOT_FIELD_KEY][1:-1]
                    if key in data_dict.keys():
                        annotation.update( pdfrw.PdfDict(V='{}'.format(data_dict[key])))

    pdfrw.PdfWriter().write(output_pdf_path, template_pdf)

data_dict = {
    'field_1':'im field_1 value',
    'field_2':'im field_2 value',
    'options_1':True,
    'options_2':False,
}

write_fillable_pdf(INVOICE_TEMPLATE_PATH, INVOICE_OUTPUT_PATH, data_dict)