基于以上所有内容，我建议使用稍微修改过的版本(python3):

while循环调用readline (iter建议的解决方案似乎永远阻塞我- Python 3, Windows 7) 结构化的，因此在轮询返回not- none后不需要重复读取数据的处理 Stderr管道到stdout，因此两个输出输出都被读取 增加了获取cmd退出值的代码。

代码:

import subprocess
proc = subprocess.Popen(cmd, shell=True, stdout=subprocess.PIPE,
                        stderr=subprocess.STDOUT, universal_newlines=True)
while True:
    rd = proc.stdout.readline()
    print(rd, end='')  # and whatever you want to do...
    if not rd:  # EOF
        returncode = proc.poll()
        if returncode is not None:
            break
        time.sleep(0.1)  # cmd closed stdout, but not exited yet

# You may want to check on ReturnCode here

我们也可以使用默认的文件迭代器来读取stdout，而不是使用iter构造readline()。

import subprocess
import sys

process = subprocess.Popen(
    your_command, stdout=subprocess.PIPE, stderr=subprocess.STDOUT
)
for line in process.stdout:
    sys.stdout.write(line)

Python 3的TLDR:

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)

你有两种方法来做到这一点，要么从read或readline函数创建一个迭代器，然后做:

import subprocess
import sys

# replace "w" with "wb" for Python 3
with open("test.log", "w") as f:
    process = subprocess.Popen(your_command, stdout=subprocess.PIPE)
    # replace "" with b'' for Python 3
    for c in iter(lambda: process.stdout.read(1), ""):
        sys.stdout.write(c)
        f.write(c)

or

import subprocess
import sys

# replace "w" with "wb" for Python 3
with open("test.log", "w") as f:
    process = subprocess.Popen(your_command, stdout=subprocess.PIPE)
    # replace "" with b"" for Python 3
    for line in iter(process.stdout.readline, ""):
        sys.stdout.write(line)
        f.write(line)

或者您可以创建一个读取器和一个写入器文件。将写入器传递给Popen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())

通过这种方式，您可以将数据写入test.log和标准输出中。

文件方法的唯一优点是代码不会阻塞。因此，您可以在此期间做任何您想做的事情，并以无阻塞的方式随时从阅读器读取。当您使用PIPE时，read和readline函数将阻塞，直到分别将一个字符写入管道或将一行字符写入管道。

基于以上所有内容，我建议使用稍微修改过的版本(python3):

while循环调用readline (iter建议的解决方案似乎永远阻塞我- Python 3, Windows 7) 结构化的，因此在轮询返回not- none后不需要重复读取数据的处理 Stderr管道到stdout，因此两个输出输出都被读取 增加了获取cmd退出值的代码。

代码:

import subprocess
proc = subprocess.Popen(cmd, shell=True, stdout=subprocess.PIPE,
                        stderr=subprocess.STDOUT, universal_newlines=True)
while True:
    rd = proc.stdout.readline()
    print(rd, end='')  # and whatever you want to do...
    if not rd:  # EOF
        returncode = proc.poll()
        if returncode is not None:
            break
        time.sleep(0.1)  # cmd closed stdout, but not exited yet

# You may want to check on ReturnCode here

遇到了同样的问题，并使用process.sdtout.read1()得出了一个简单而干净的解决方案，它完全满足了我在python3中的需求。

下面是一个使用ping命令的演示(需要网络连接):

from subprocess import Popen, PIPE

cmd = "ping 8.8.8.8"
proc = Popen([cmd], shell=True, stdout=PIPE)
while True:
    print(proc.stdout.read1())

当ping命令实时报告其数据时，大约每秒钟就会在python控制台中打印一行新行。

类似于前面的答案，但下面的解决方案适用于我在windows上使用Python3提供一个通用的方法来实时打印和登录(来源)

def print_and_log(command, logFile):
    with open(logFile, 'wb') as f:
        command = subprocess.Popen(command, stdout=subprocess.PIPE, shell=True)

        while True:
            output = command.stdout.readline()
            if not output and command.poll() is not None:
                f.close()
                break
            if output:
                f.write(output)
                print(str(output.strip(), 'utf-8'), flush=True)
        return command.poll()