import os
os.listdir()

with open(edit_file, 'r+', encoding='utf-8') as f:
    file_lines = f.readlines()
    i = 0
    for each_line in file_lines:
        new_line = re.sub(re_pattern, re_replace, each_line)
        file_lines[i] = new_line
        i = i + 1
with open(edit_file, 'w', encoding='utf-8') as f:
    f.writelines(file_lines)