Python: Replace line clearing everything after line -

the following replace line function:

def replace_line(file_name, num, replaced):     f = open(file_name, 'r', encoding='utf-8')     lines = f.readlines()     lines[num] = replaced     f.close()     f = open(file_name, 'w', encoding='utf-8')     f.writelines(lines)     f.close() 

i using following line run code:

replace_line('store.txt', int(line), new) 

when run code, replaces line removes after line. example, if list:

to honest, i'm not sure wrong original function. tried redoing , seems work fine:

def replace_line(file_name, line_num, text):     open(filename, 'r+') f:         lines = f.read().splitlines()         lines[line_num] = text         f.seek(0)         f.writelines(lines)         f.truncate() 

please note overwrites entire file. if need handle large files or concerned memory usage, might want try approach.