如何使用python替换开放CSV中的空值？

import csv

with open('file.csv', 'r') as file:
    reader = csv.reader(file)

with open('new_file.csv', 'w', newline='') as new_file:
    writer = csv.writer(new_file)

for row in reader:
    new_row = [value if value else 'replacement_value' for value in row]
    writer.writerow(new_row)

import csv

with open('file.csv', 'r') as file:
    reader = csv.reader(file)
    
    with open('new_file.csv', 'w', newline='') as new_file:
        writer = csv.writer(new_file)
        
        for row in reader:
            new_row = [value if value else 'replacement_value' for value in row]
            writer.writerow(new_row)