windows only: pdfquery is locking the opended pdf-file about pdfquery HOT 1 OPEN

import os
import pdfquery
import time

def is_pdf(file):
    if os.path.splitext(file.lower())[1] == '.pdf':
        return True


rename_files = []
pdf_files = os.listdir('./pages')
for pdf_file in filter(is_pdf, pdf_files):
    print(pdf_file)
    with open(os.path.join('pages', pdf_file), 'rb') as myfile:
        pdf = pdfquery.PDFQuery(myfile)
        pdf.load()
        for e in pdf.tree.iter():
            text = e.text
            if text:
                text = text.replace(' ', '')
                if text[0:7] == '4002629':
                    rename_files.append(
                        (pdf_file, '{}.pdf'.format(text))
                    )
                    break

for oldname, newname in rename_files:
    os.rename(os.path.join('pages', oldname),
              os.path.join('pages', newname)
              )