使用python打开txt文件，只将第一个数字替换为所需的新数字

file_path = 'path/to/file.txt'
with open(file_path, 'r') as file:
    content = file.read()

import re

new_number = 10
content = re.sub(r'\d+', str(new_number), content, 1)

with open(file_path, 'w') as file:
    file.write(content)

import re

file_path = 'path/to/file.txt'
new_number = 10

with open(file_path, 'r') as file:
    content = file.read()
    content = re.sub(r'\d+', str(new_number), content, 1)

with open(file_path, 'w') as file:
    file.write(content)