目录

file.write() 内容超过 4K 才会写入磁盘

验证代码

import os
import tempfile

for count in range(1, 4100):
    content = '0'*count
    with tempfile.NamedTemporaryFile() as file:
        print(file.name)
        file.write(content.encode())

        with open(file.name, 'r') as tf:
            content_len = len(tf.read())
            if content_len > 0:
                print(f'{count} bytes written successfully.')

运行结果

/var/folders/bc/7lz308t90gb1h1xw6k4j65x80000gn/T/tmpj458ozas
/var/folders/bc/7lz308t90gb1h1xw6k4j65x80000gn/T/tmpmrxo8sg1
/var/folders/bc/7lz308t90gb1h1xw6k4j65x80000gn/T/tmp0hu_i4hz
4097 bytes written successfully.
/var/folders/bc/7lz308t90gb1h1xw6k4j65x80000gn/T/tmpdu_tycee
4098 bytes written successfully.
/var/folders/bc/7lz308t90gb1h1xw6k4j65x80000gn/T/tmplbtytgnk
4099 bytes written successfully.

修复 4K 以内写入磁盘的问题

file.write(content.encode()) 后面加入
file.flush()

默认 file.close() 临时文件会自动删除

参数 delete 设置为 False 时，关闭文件后不会自动删除

tempfile.NamedTemporaryFile(delete=False)

参考资料