Method reads properly but the written text file only has 1 line. Is \n not working? - python-3.x

Question

The goal is to extract specific data from a text file under a folder
then write that data into another file under different folder
The extraction part works, save to variables and can even print them
The rises when you try to write them to a file
The file is empty
Need to write in this format
{self.title};;;{self.author};;;{self.release_date};;;
{self.last_update_date};;;{self.language};;;{self.producer};;;{self.book_path}
# This class includes all the operations related to a book
class Operation:
"""
Need to include these class variables
book_title_list (List of all books titles such as “[title1, title2, title3, …]”)
book_info_dict = “{title1: obj1, title2:obj2, title3:obj3…….}”)
"""
book_folder_path = './data/books_data/'
book_info_path = './data/result_data/books.txt'
def extract_book_info(self):
directory_files = os.listdir(self.book_folder_path) # Stores the .txt files under books_data folder
try:
for i in directory_files:
with open(f'{self.book_folder_path}/{i}', 'r', encoding='utf8') as f:
f_contents = f.readlines()
f_line_free = list(map(lambda x: x.strip(), f_contents))
f_lists = f_line_free[10:22] # Slicing only the required elements of the list
"""
Extracting only the necessary part and storing them
under proper variables
"""
title = f_lists[0]
author = f_lists[2]
release_date = f_lists[4]
last_update_date = f_lists[5]
language = f_lists[7]
producer = f_lists[11]
"""
Extracting the desired values
"""
title_data = title[7:]
author_data = author[8:]
release_date_data = release_date[14:]
last_update_date_data = last_update_date[24:-1]
language_data = language[10:]
producer_data = producer[13:]
print(title_data)
with open(self.book_info_path, 'w', encoding="utf8") as wf:
wf.write(f'{title_data};;;{author_data};;;{release_date_data};;;'
f'{last_update_date_data};;;{language_data};;;{producer_data};;;{self.book_info_path}\n')
return True
except FileNotFoundError:
return False
except Exception:
return False