handle huge file reading in python

read_in_chunk.py

from functools import partial, wraps
from typing import TextIO, Callable

def chunked_file(fp, block_size):
    for chunk in iter(partial(fp.read, block_size), ''):
        yield chunk

def transformer(data):
    //do transformation for input data
    output = data
    return output

def read_file(file_to_read, file_to_write):
    with open(file_to_read) as f_read:
        for chunk in chunked_file(f_read):
            //do transformation
            output = transformer(chunk)
            write_file(file_to_write, output)
 
def write_file(file_path, data):
    with open(file_path, "w+") as f_write:
        f_write.write(data)