How to open shell in python

In Python, you can use the subprocess module to open an external shell: 1. Import the subprocess module 2. Create a Process object 3. Read the output 4. Get the exit code.

How to open Shell in Python

In Python, you can use the subprocess module Open an external shell. The following are detailed steps:

1. Import subprocess module

<code class="python">import subprocess</code>

2. Create Process object

Create subprocess.Popen object, specifying the shell command and parameters to be started.

<code class="python"># 打开 bash shell
process = subprocess.Popen(['bash'], shell=True)

# 打开 cmd shell（Windows）
process = subprocess.Popen(['cmd'], shell=True)</code>

3. Read the output

Use the communicate() method to read the output of the shell command.

<code class="python"># 读取标准输出和标准错误输出
output, error = process.communicate()</code>

4. Get the exit code

Use the returncode attribute to get the exit code of the shell command.

<code class="python"># 获取退出代码，0 表示成功
exit_code = process.returncode</code>

Example:

<code class="python">import subprocess

# 打开 bash shell 并执行 ls 命令
process = subprocess.Popen(['bash', '-c', 'ls'], shell=True)

# 读取输出
output, error = process.communicate()

# 打印输出
print(output.decode('utf-8'))

# 获取退出代码
exit_code = process.returncode</code>

Note:

• shell=True Parameters allowed Starts in shell mode, enabling the shell to interpret special characters in commands, such as pipes and redirections.
• You can also specify standard input, output, and error output using the stdin, stdout, and stderr parameters.

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