如何捕获实时子流程输出并同时记录它？

子进程命令的实时输出

要捕获实时输出并将其存储以进行记录，请采用以下方法之一：

使用迭代器

创建迭代器从子进程标准输出读取并同时写入：

import subprocess
import sys

with open("test.log", "wb") as f:
    process = subprocess.Popen(your_command, stdout=subprocess.PIPE)
    for c in iter(lambda: process.stdout.read(1), b""):
        sys.stdout.buffer.write(c)
        f.buffer.write(c)

使用写入器和读取器

将写入器传递给子进程并从读取器读取：

import io
import time
import subprocess
import sys

filename = "test.log"
with io.open(filename, "wb") as writer, io.open(filename, "rb", 1) as reader:
    process = subprocess.Popen(command, stdout=writer)
    while process.poll() is None:
        sys.stdout.write(reader.read())
        time.sleep(0.5)
    # Read the remaining
    sys.stdout.write(reader.read())

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