code: def replace_embedded(self,src_file,dst_file):
          
          with open(dst_file, 'rb') as fh:
              crc = self.get_file_crc(src_file)
              self.crc_to_new_embedded[crc] = fh.read()
docs: Replace one embdded object by another one into a docx
  
          This has been done mainly because it is not possible to add images
          in docx header/footer.
          With this function, put a dummy picture in your header/footer,
          then specify it with its replacement in this function
  
          Syntax: tpl.replace_embedded('dummy_doc.docx','doc_to_paste.docx')
  
          Note2 : it is important to have the source file as it is required to
                  calculate its CRC to find them in the docx