How to open cmd command window in python

Steps to use Python to open the CMD window: 1. Import the subprocess module; 2. Create a subprocess object, specify command parameters, and redirect the output; 3. Get the subprocess output; 4. Decode the output (optional).

Open the CMD command window with Python

The steps to open the Windows CMD command window using Python are as follows:

1. Import the subprocess module

First, you need to import Python's subprocess module, which is used to create and manage subprocesses.

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

2. Create subprocess object

Create a subprocess object to represent the CMD process. You can use the subprocess.Popen() function and specify the following arguments:

• args: The command to run (in this case 'cmd').
• stdout: Specifies the file object to which the subprocess's standard output stream is redirected (in this case subprocess.PIPE, which creates a pipe object , so that Python can read the output of the child process in the parent process).
• stderr: Specifies the file object to which the subprocess's standard error stream is to be redirected (also subprocess.PIPE in this case).

<code class="python">process = subprocess.Popen(['cmd'], stdout=subprocess.PIPE, stderr=subprocess.PIPE)</code>

3. Get the subprocess output

Use the subprocess.communicate() function to get the standard output and error output of the subprocess . This function will block the parent process until the child process completes execution.

<code class="python">stdout, stderr = process.communicate()</code>

4. Decode output (optional)

The subprocess module returns the output of the subprocess as a byte stream. If you need to process text output, you need to use the decode() function to decode it into text.

<code class="python">stdout_text = stdout.decode('utf-8')
stderr_text = stderr.decode('utf-8')</code>

Full example:

<code class="python">import subprocess

process = subprocess.Popen(['cmd'], stdout=subprocess.PIPE, stderr=subprocess.PIPE)
stdout, stderr = process.communicate()
stdout_text = stdout.decode('utf-8')
stderr_text = stderr.decode('utf-8')

print('stdout:', stdout_text)
print('stderr:', stderr_text)</code>

Now you can open the CMD command window and access its output through a Python script.

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