subprocess.Popen

subprocess.Popen()是Python中用于执行外部命令的函数。它允许你在Python脚本中启动一个新的进程，并与其进行交互。下面是两个关于subprocess.Popen()的例子：

1. 使用subprocess.Popen()执行adb shell命令，并输出结果：

import subprocess

# 进入shell
s = subprocess.Popen("adb shell", stdout=subprocess.PIPE, stdin=subprocess.PIPE)

# 再次输入指令ps -A
s.stdin.write(b"ps -A")

# 关闭输入
s.stdin.close()

# 输出每行的数据
for i in s.stdout.readlines():
    print(i)

2. 使用subprocess.Popen()执行df -h命令，并获取进程信息：

import subprocess

p = subprocess.Popen("df -h", shell=True, stdout=subprocess.PIPE)

# 打印进程信息
print(p)

相关问题

subprocess.popen

`subprocess.Popen` 是 Python 中一个用于创建新进程的函数。它允许你在 Python 脚本中启动一个新的进程，并与其进行交互。该函数接受一些参数，包括要执行的命令、命令行参数、执行环境、标准输入、标准输出和标准错误的处理方式等。

通常，使用 `Popen` 函数时需要指定 `stdout` 和 `stderr` 参数，以便在 Python 中获取被执行命令的输出信息。此外，还可以使用 `communicate()` 方法与所创建的子进程进行交互，向其发送数据并获取其返回的数据。

例如，以下代码可以在 Python 中启动一个新的进程，并在其中执行 `ls` 命令，然后获取其输出信息：

import subprocess

output = subprocess.Popen(['ls', '-l'], stdout=subprocess.PIPE).communicate()[0]

print(output)

这将在终端中输出 `ls -l` 命令的输出信息。

subprocess.Popen subprocess.run

subprocess.Popen and subprocess.run are both modules in Python's subprocess module that are used for running external commands. Here's a brief explanation of each:

1. subprocess.Popen: This function is used to create a new process and execute a command within it. It provides more flexibility and control over the execution process. Popen returns a Popen object, which allows you to interact with the running process, such as reading its output or terminating it.

Example usage:

import subprocess

# Run a command and get its output
result = subprocess.Popen(['ls', '-l'], stdout=subprocess.PIPE)
output = result.communicate()
print(output.decode('utf-8'))

2. subprocess.run: This function is a higher-level convenience function introduced in Python 3.5. It is used to run a command and wait for it to complete. It returns a CompletedProcess object that provides information about the completed process, such as return code and output.

Example usage:

import subprocess

# Run a command and get its output
result = subprocess.run(['ls', '-l'], capture_output=True, text=True)
print(result.stdout)

Both functions can be used to execute external commands, but the choice between them depends on your requirements. Popen offers more flexibility, while run provides a simpler and more straightforward way to execute commands.