subprocess.Popen(tool_path)
时间: 2024-06-19 07:03:11 浏览: 12
subprocess.Popen是Python中的一个模块,它可以启动一个新的进程来运行外部的命令或程序。当我们需要调用其他语言编写的程序或者一些系统命令时,就可以使用subprocess.Popen来执行这些操作。具体来说,subprocess.Popen函数的第一个参数可以指定要运行的程序或命令的路径,它返回一个Popen对象,通过这个对象可以与子进程进行交互。
当我们使用subprocess.Popen(tool_path)时,它会启动一个新的进程,并执行指定路径下的可执行文件或命令。同时,它还可以接收一些可选参数,如标准输入、输出、错误流等,用来控制子进程的执行环境。
例如:
```
import subprocess
# 执行cmd命令并打印输出
result = subprocess.Popen('cmd /c dir', stdout=subprocess.PIPE, shell=True)
output = result.stdout.read().decode('gbk')
print(output)
```
相关问题
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:
```python
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:
```python
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.
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:
```python
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:
```python
import subprocess
p = subprocess.Popen("df -h", shell=True, stdout=subprocess.PIPE)
# 打印进程信息
print(p)
```
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